Analyses of Isokinetic and Closed Chain Movements for Hamstring Reciprocal Coactivation
|
|
- Morris Hubbard
- 5 years ago
- Views:
Transcription
1 Journal of Sport Rehabilitation, 2007, 16, Human Kinetics, Inc. Analyses of Isokinetic and Closed Chain Movements for Hamstring Reciprocal Coactivation John P. Miller and Ronald V. Croce Context: Researchers have postulated that coactivation of the hamstrings during active knee extension assists the anterior cruciate ligament in maintaining knee joint stability by exerting an opposing force to anterior tibial translation. Objective: To compare the reciprocal coactivation of the hamstrings while performing low and high velocity isokinetic movements and two closed chain movements. Design: Within subject s comparison of isokinetic and closed chain exercises. Setting: Biomechanics laboratory utilizing a Cybex norm isokinetic dynamometer and Biopac Data Collection system. Participants: 12 healthy women. Main Outcome Measures: The root mean square of the Electromyogram (rmsemg) was used as a measure of overall muscle activity. Results: The rmsemg for hamstring coactivation during knee extension showed significant differences between the isokinetic movements and the closed chain exercises with greater coactivation when performing the isokinetic movements. In addition, greater activity was seen at the higher isokinetic velocity and during the one legged squat. Conclusions: These results suggest isokinetic movements, particularly at high speed, can more effectively increase the coactivation activity of the hamstrings when compared to two closed chain activities. Key Words: functional exercise, electromyogram, leg musculature Researchers have investigated the effect of hamstring muscle force on knee joint stability both in vitro 1,2 and in vivo. 3,4 Of particular interest are those in vivo studies that have measured hamstring surface electromyography (SEMG) during knee-joint exercise. 4,5,6,7,8,9,10 Based on these studies, researchers have postulated that coactivation (antagonist activity) of the hamstrings during active knee extension assists the anterior cruciate ligament (ACL) in maintaining joint stability by exerting an opposing force to anterior tibial translation. 4,10 A lack of knee-joint stability often results in quadriceps muscle contractions creating unwanted stresses on internal joint structures, episodes of joint instability, and partial atrophy of the surrounding muscles. 3,11 Recently, Croce et al 12,13 and Miller et al 14 examined hamstring coactivation patterns during varying velocity isokinetic movements. They noted that movement velocity impacted the coactivation activity of the biceps femoris (BF) and medial hamstrings. 12,13,14 The authors are with the Department of Kinesiology at the University of New Hampshire in Durham. jm@cisunix.unh.edu 319
2 320 Miller and Croce Isokinetic dynamometry is often utilized to assess muscle function and is frequently a part of a rehabilitation protocol. A common rehabilitation and testing protocol utilizes both low and high-velocity movements, commonly termed Velocity Spectrum Exercise or Velocity Spectrum Testing (VST), using reciprocal movements (ie, extension immediately followed by flexion). 15,16,17 With VST the individual moves at low and high velocities to assess muscle function under varying demands. In addition to isokinetic dynamometry, functional test such as leg squats and hops are also used to evaluate a patient s readiness to return to full physical activity. 18,19,20 The purpose of functional testing is to assess a patient s performance while performing activities similar to competition demands. As two distinct modalities are utilized in rehabilitation and assessment, it stands to reason that a comparison between the two techniques would be useful. 19,21,22 English et al 21 determined that a single leg hop was a good measure of leg strength comparable to an isokinetic assessment when body weight was factored. Wilk et al 22 also found positive correlates between functional testing and isokinetic scores but only for the quadriceps with no correlation for hamstring scores. Lephart et al 19 found that isokinetic assessment was a poor measure of an athlete s functional capacity. All of these studies 19,21,22 measured isokinetic parameters such as work and peak torque and functional parameters such as distance to perform the comparisons. What has not been examined is a comparison of the actual muscle activity between isokinetic and functional activity, particularly as it relates to hamstring coactivation. Such a comparison could assist clinicians in determining which exercises or type of movement best utilize the hamstrings, therefore may minimize anterior knee translation. Accordingly, the purpose of this investigation was to compare hamstring coactivation during isokinetic, both high and low speed movements, to hamstring coactivation when performing two closed chain rehabilitative exercises. Experimental Design Methods A within subjects repeated measures design was performed with 4 exercises (Isokinetic s -1 and s -1 ) and two closed chain exercises (one legged squat and two legged squat) in which hamstring coactivation muscle activity was the measure of interest. Isokinetic speeds were chosen to represent both high and low speed movements as is typically done in an isokinetic assessment. Subjects The subjects were 12 healthy adult females (age = 22.7 ± 2.0 years, mean height = ± 6.6 cm, mean weight = 63.5 ± 5.8 kg) with no known knee pathologies and familiarity with isokinetic testing and the prescribed closed chain exercises. The Institutional Review Board of the University of New Hampshire approved methods and procedures.
3 Isokinetic vs. Closed Chain Exercises 321 Instrumentation Electromyography. Bipolar surface EMG was used to determine the electrical activity of the biceps femoris and the medial hamstrings (semimembranosus and semitendonosus) during the isokinetic movements and during the closed chain exercises. Silver/silver chloride surface electrodes were placed 2.5 cm apart and parallel to the muscle fibers over the longitudinal midline between the motor point and the tendon according to Warfel. 23 A common reference electrode was placed over the head of the fibula. The skin was cleaned and abraded to achieve skin impedance of < 5 kω. The EMG signal was digitized on-line with a sampling frequency of 2000 Hz using the Biopac collection system processed through a Dell Optiplex computer with high and low pass filters of 20 and 400 Hz, respectively. The gain was set at 1000 with a common mode rejection ratio of 90 db. The raw EMG signal was stored and the mean amplitude root mean square (rmsemg) was calculated for the repetition in which the peak torque occurred for the tested isokinetic velocities. For the closed chain exercises, the repetition in which maximal muscle activity was observed was analyzed. Coactivation was measured as the hamstring activity during the knee extension phase of the activities. The rmsemg was calculated as a percentage of a maximal voluntary contraction according to Knutson et al and used as a measure of muscular activity. 24 Dynamometer Set Up Each subject was seated with her back fully supported in 75 to 80 degrees of hip flexion. Velcro straps were placed across the hips, waist, and chest with the lower tibia strapped into the pad on the arm of a Cybex Norm isokinetic dynamometer (Computer Sports Medicine, Inc.: Humac Norm Testing and Rehabilitation System Users Guide, Stoughton, MA, 2003). 26 The lateral epicondyle of the knee was aligned with the axis of rotation of the dynamometer. Test Protocol Prior to data collection, subjects participated in stretching exercises for the quadriceps and the hamstrings for approximately 10 minutes and were tested at angular velocities of s -1 and s -1. Subjects were allowed 6 submaximal warm-up repetitions at each angular velocity to become familiar with procedures. They performed maximal effort contractions of the quadriceps (extension) followed by maximal effort flexion of the hamstrings for six continuous repetitions at the two test velocities. A 5-minute rest period was given between each test velocity to minimize the effect of fatigue. 27 Order of velocities was counterbalanced over subjects. Subjects were instructed to push or pull as fast as possible using strong verbal encouragement ( push fast or pull fast ) during the test procedures. Closed Chain Exercises During both the one-leg and two-legged squats subjects were told to flex the leg to a count of one and return to the extended position to a count of one. As the actual
4 322 Miller and Croce speed of movement could vary among subjects, we measured the actual speed by attaching an electrogoniometer (Biopac systems) to the lateral side of the leg on which the electrodes were placed and calculating the time and ROM. Using this system, it was determined that for both the one legged and two legged squat the subjects moved an average of s -1 with a high speed of 132. s -1 and a low speed of s -1. One-Legged Squat The subject stood on the tested (balance) leg keeping the other leg off the floor: the shoulders flexed 90 degrees and their trunk straight with the eyes looking forward. By flexing the balance leg, the subjects lowered themselves till the thigh of the balance leg was parallel to the floor. The subject then stood upright by pressing the heel of the balance leg into the floor while keeping the trunk straight. Six repetitions were performed with the repetition in which the highest muscular activity was seen used for analyses. Two-Legged Squat The subject stood with both feet on the floor, shoulders flexed 90 degrees, trunk straight with the eyes looking forward. By flexing both legs, the subject lowered until the thighs were parallel to the floor. The subject then stood upright by pressing heels into the floor while keeping the trunk straight. Six repetitions were performed with the repetition in which the highest muscular activity was seen used for analyses. Data Analysis A repeated measures ANOVA was used to assess differences in the hamstrings rmsemg trials. The conservative Greenhouse-Geisser adjustment factor was used to evaluate observed within-group F ratios. Post hoc comparisons consisted of planned mean contrasts for the four different exercises. The criterion level for significant difference was set at P < Results The rmsemg for hamstring coactivation during knee extension showed significant differences between the open chain isokinetic movements and the closed chain exercises (F = , P < ) with greater coactivation when performing the isokinetic movements (27% vs. 18% MVC; Figure 1). In addition differences were seen between s -1 and s -1 (F = 8.375, P < 0.01) with the greater activity seen at the higher velocity (30% vs. 24% MVC) and between the one- and two-legged squats (F = 15.85, P < 0.005) with greater coactivation during the onelegged squat (22% vs. 14% MVC).
5 Isokinetic vs. Closed Chain Exercises 323 Figure 1 Mean and Standard Error of Measurement for the percent MVC Hamstring cocontraction activity for the open chain isokinetic exercises and the closed chain one- and two-legged squat. Discussion This study serves to contrast the motor unit recruitment of the hamstrings during isokinetic and closed chain activities. Specifically, this study suggests that hamstring coactivation is greater during isokinetic movements, increasing as velocity increases. This may indicate an increased recruitment of the motor units at the higher velocities. The relationship between EMG and movement velocity has previously been examined. 6,13,14 Hagood et al 6 and Miller et al 14 noted that antagonistic EMG activity of the hamstrings increased with velocity of movement demonstrating overall greater activity. Robertson et al examining agonistic activity and found a strong relationship between hamstring torque production and iemg activity. 28 Hagood et al 6 and Miller et al 14 examined antagonistic activity and the integrated EMG while we examined agonistic activity and the rmsemg. The combined results shed light on the role of velocity on muscle activation. Specifically, those antagonistic muscles increase overall activity as velocity increases but torque decreases demonstrating increased muscular recruitment. This may be due to the antagonist muscles needing to brake the action of the agonistic group hence protecting the joint.
6 324 Miller and Croce Comparisons between functional and isokinetic assessments have been reported previously. 19,21,22 Lephart et al 19 determined that isokinetic parameters were a poor measure of an individual s functional capacity, instead recommending a battery of functional test. English et al, 21 however, found a more positive relationship between isokinetic and functional parameters when work performed and body weight were considered. Wilk et al 22 noted a positive correlation between functional testing and isokinetic knee extension. The authors concluded that a combination of parameters should be used to assess a patient s capacities. The current study was unique in that we were not concerned with actual functional assessment or isokinetic scores but rather on the ability of the hamstrings control extension, suggestive of their ability to properly stabilized the knee. While hamstring coactivation is associated with the muscles ability to stabilize, it is not a direct measure of joint stability, however, and should not be misinterpreted as such. We found that the closed chain movements we examined did not result in as great a coactivation as the isokinetic movements (Figure 1). This can be due to many reasons such as speed of movement or load placed upon the muscles. In addition, as the closed chain exercises utilize the hamstrings across two joints (knee and hip), there may have been less hamstring activity due to assistance in hip extension by the gluteals. This study was limited to young healthy females, therefore the results can be generalized only to that population. Also, we limited our functional assessment to two simple closed chain exercises and cannot apply these results to other functional movements. We chose to normalize hamstring coactivation as a percentage of a MVC as opposed to as a percentage of the antagonistic activity as done previously. 25 This was done for consistency between the two modes of exercise, as it would have been impractical to establish an MVC for the closed chain activities. References 1. Draganich E, Vahey IW. An in vitro study of anterior cruciate ligament strain induced by quadriceps and hamstring forces. J Orthop Res. 1990;8: Kalund S, Sinkjaer T, Arendt-Nielsen L, Simonsen 0. Altered timing of hamstring action in anterior cruciate ligament deficient patients. Am J Sports Med. 1990;18: Yasuda K, Sasaki T. Muscle exercise after anterior cruciate ligament reconstruction: biomechanics of the simultaneous isometric contraction method of the quadriceps and the hamstrings. Clin Orthop. 1987;220: Yasuda K, Sasaki T. Exercise after anterior cruciate ligament reconstruction: the force exerted on the tibia by the separate contractions of the quadriceps and or the hamstrings. Clin Orthop. 1987;220: Draganich LE, Jaeger RI, Kralj, AR. Co-activation of the hamstrings and quadriceps during extension of the knee. J Bone Joint Surg. 1989;7la: Hagood S, Solomonow, M, Baratta, R, Zhou, R. D ambrosia, R.The effect of joint velocity on the contribution of the antagonist musculature to knee stiffness and laxity. Am J Sports Med. 1990;18: Osternig LR, Caster BL, James CR. Contralateral hamstring (biceps femoris) coactivation patterns and anterior cruciate ligament dysfunction. Med Sci Sports Exe/. 1995;27: Osternig LR, Hamill L, Corocos DM, Lander, L. Electromyographic patterns accompanying isokinetic exercise under varying speed and sequencing conditions. Am J Phys Med. 1984;63:
7 Isokinetic vs. Closed Chain Exercises Osternig LR, Hamill J, Lander JE, Robertson R. Co-activation of sprinter and distance runner muscles in isokinetic exercise. Med Sci Sports Exer 1986;18: Snow EI, Cooper L, Quanbury AO, Anderson I. Antagonist cocontraction of knee flexors during constant velocity muscle shortening and lengthening. J Electromyog Kinesiol. 1993;3: Solomonow M, Baratta R, D ambrosia R. The role of the hamstrings in the rehabilitation of the anterior cruciate ligament-deficient knee in athletes. Sports Med. 1989;7: Croce RV, Miller JP. The effect of movement velocity and movement pattern on reciprocal co-activation of the hamstrings. Electromyogr Clin Neurophysiol. 2003l;43: Croce RV, Miller JP, Confessore R, Vallas, J. Reciprocal coactivation patterns of the lateral and medial quadriceps and hamstrings during low- and moderate-speed isokinetic movement. J Sports Rehab. 1999;87: Miller JP, Croce RV, Hutchins R. Reciprocal coactivation patterns of the medial and lateral quadriceps and hamstrings during slow, medium and high speed isokinetic movements. J Electromyogr Kinesiol. 2000;10: Dvir Z. Isokinetics Muscle Testing and Clinical Applications. Livingstone, NY: Churchill; Ewing, LD, Wolfe R, Rogers MA, Asmudson ML, Stull G. Effects of velocity of isokinetic training on strength, power and quadriceps muscle fiber characteristics. Eur J Appl Physiol. 1990;61: Perrin DH. Isokinetic Exercise and Assessment. Champaign Il: Human Kinetics; Barber SD, Noyes FR, Mangine RE, McCloskey JW, Hartman W. Quantitative assessment of functional limitations in normal and anterior cruciate ligament deficient knees. Clin Orthop. 1990;255: Lephart SM, Perrin DH, Fu FH, Gieck JH, McCue FC, Irrgang JJ. Relationship between selected physical characteristics and functional capacity in the anterior cruciate ligament insufficient athlete. J Orthop Sports Phys Ther. 1992;16(4): Beutler AI,Cooper W, Kirkendall DT, Garrett Jr WE. Electromyographic analysis of single-leg, closed chain exercises: implications for rehabilitation after anterior cruciate ligament reconstruction. J Athletic Training. 2002;37(1): English R, Brannock M, Chik WT, Eastwood LS, Uhl T. The relationship between lower extremity isokinetic work and single-leg functional hop-work test. J Sport Rehabil. 2006;15: Wilk KE, Romaniello WT, Soscia SM, Arrigo CA, Andrews JR. The relationship between subjective knee scores, isokinetic testing, and functional testing in the ACLreconstructed knee. J Orthop Sports Phys Ther. 1994;20(2): Warfel. JH. The Extremities: Muscles and Motor Points. 5th ed. Philadelphia Pa: Lea and Febiger; Knutson LM, Soderburg GL, Ballantyne BT, Clarke WR. A study of various normalization data for within day electromyographic data. J Electromyography Kinesiol. 1994;4(1): Kellis E, Baltzopoulos V. The effects of normalization method on antagonistic activity patterns during eccentric and concentric isokinetic knee extension and flexion. J Elctromyogr Kinesiol. 6; : Computer Sports Medicine, Inc. Humac Norm Testing and Rehabilitation System Users Guide. Stoughton, MA: Author; Perrin DH, Arnold BL. Effect of repeated isokinetic concentric and eccentric contractions on quadriceps femoris muscle fatigue. Isokinetics Exerc Sci. 1995;5: Robertson RN, Osternig LR, Hammill J, Devita P. EMG-torque relationships during isokinetic dynamometer exercise. Sports Train Med Rehabil. 1990;2:1-10.
Effect of cold treatment on the concentric and eccentric torque-velocity relationship of the quadriceps femoris
Effect of cold treatment on the concentric and eccentric torque-velocity relationship of the quadriceps femoris By: Kerriann Catlaw *, Brent L. Arnold, and David H. Perrin Catlaw, K., Arnold, B.L., & Perrin,
More informationA Discussion of Job Content Validation and Isokinetic Technology. Gary Soderberg, Ph.D., PT, FAPTA i March 2006
A Discussion of Job Content Validation and Isokinetic Technology Gary Soderberg, Ph.D., PT, FAPTA i March 2006 Testing of human function is difficult because of the great capability associated with our
More informationThe Reliability of Four Different Methods. of Calculating Quadriceps Peak Torque Angle- Specific Torques at 30, 60, and 75
The Reliability of Four Different Methods. of Calculating Quadriceps Peak Torque Angle- Specific Torques at 30, 60, and 75 By: Brent L. Arnold and David H. Perrin * Arnold, B.A., & Perrin, D.H. (1993).
More informationPOST-ACTIVATION POTENTIATION AND VERTICAL JUMP PERFORMANCE. Cody Hardwick
POST-ACTIVATION POTENTIATION AND VERTICAL JUMP PERFORMANCE Cody Hardwick Submitted in partial fulfillment of the requirements For the degree Master of Science in Kinesiology In the School of Public Health
More informationValidity of Data Extraction Techniques on the Kinetic Communicator (KinCom) Isokinetic Device
Validity of Data Extraction Techniques on the Kinetic Communicator (KinCom) Isokinetic Device By: Laurie L. Tis, PhD, AT,C * and David H. Perrin, PhD, AT,C Tis, L.L., & Perrin, D.H. (1993). Validity of
More informationImpact of Contraction Intensity and Velocity on Vastus Lateralis SEMG Power Spectrum and Amplitude
Impact of Contraction Intensity and Velocity on SEMG Power Spectrum and Amplitude J.P. Miller 1 R.V. Croce 1 W.J. Smith 2 1 Motor Control and Biomechanics Laboratory, Department of Kinesiology, University
More informationEffect of Preload and Range of Motion on Isokinetic Torque in Women
Effect of Preload and Range of Motion on Isokinetic Torque in Women By: Laurie L. Tis, David H. Perrin, Arthur Weltman, Donald W. Ball, and Joe H. Gieck * Tis, L.L., Perrin, D.H., Weltman, A., Ball, D.W.,
More informationIMPROVEMENT OF MUSCLE STRENGTH IN REHABILITATION BY THE USE OF SURFACE ELECTROMYOGRAPHY
IMPROVEMENT OF MUSCLE STRENGTH IN REHABILITATION BY THE USE OF SURFACE ELECTROMYOGRAPHY Rainbow-K.Y. Law, Kevin-S.C. Kwong, Christina-W.Y. Hui-Chan Department of Rehabilitation Sciences, The Hong Kong
More informationEMG Analysis of Lower Extremity Muscles in Three Different Squat Exercises
REPORT EMG Analysis of Lower Extremity Muscles in Three Different Squat Exercises Gaston Ariel NISHIWAKI 1, Yukio URABE 1 and Kosuke TANAKA 1 1 Department of Sport Rehabilitation, Graduate School of Health
More informationCan Muscle Power Be Estimated From Thigh Bulk Measurements? A Preliminary Study
Journal of Sport Rehabilitation, 1999, 8.50-59 O 1999 Human Kinetics Publishers, Inc. Can Muscle Power Be Estimated From Thigh Bulk Measurements? A Preliminary Study Eric Maylia, John A. Fairclough, Leonard
More informationComparison of N-K Table Offset Angles with the Human Knee Flexor Torque Curve
Comparison of N-K Table Offset Angles with the Human Knee Flexor Torque Curve By: Daniel J. LaPlaca *, Douglas R. Keskula, Kristinn I. Heinrichs, and David H. Perrin LaPlaca, D.J., Keskula, D., Heinrichs,
More informationResistive Eccentric Exercise: Effects of Visual
Resistive Eccentric Exercise: Effects of Visual Feed back on Maximum Moment of Knee Extensors and Flexors Eleftherios Kellis, BScl Vasilios Baltzopoulos, Ph D, M Phil, BSc2 Copyright 1996. All rights reserved.
More informationMaximal isokinetic and isometric muscle strength of major muscle groups related to age, body weight, height, and sex in 178 healthy subjects
Maximal isokinetic and isometric muscle strength of major muscle groups related to age, body weight, height, and sex in 178 healthy subjects Test protocol Muscle test procedures. Prior to each test participants
More informationIntramachine and intermachine reproducibility of concentric performance: A study of the Con-Trex MJ and the Cybex Norm dynamometers
Isokinetics and Exercise Science 12 (4) 91 97 91 IOS Press Intramachine and intermachine reproducibility of concentric performance: A study of the Con-Trex MJ and the Cybex Norm dynamometers C. Bardis
More informationINTERNATIONAL JOURNAL OF PHARMACEUTICAL RESEARCH AND BIO-SCIENCE
A STUDY TO ANALYSE THE ISOMETRIC STRENGTH AND ISOKINETIC PEAK TORQUES OF HAMSTRING AND QUADRICEPS AT DIFFERENT ANGLES AND ANGULAR VELOCITY OF KNEE USING ISOKINETIC DEVICE IN NORMAL INDIVIDUALS SHANTHI
More informationRelationship Between Active Hamstring Stretch Reflex Latency and Functional Knee Stability*
Relationship Between Active Hamstring Stretch Reflex Latency and Functional Knee Stability* Nicholas Clark, BEd, BSc, MSc, MCSP, MMACP, CSCS 1,2 1 Integrated Physiotherapy & Conditioning Ltd. London. UK.
More informationReliability of Lower Extremity Functional Performance Tests
Reliability of Lower Extremity Functional Performance Tests Lori A. Bolgla, PT' Douglas R. Keskula, Ph D, PT, ATC2 ports medicine clinicians commonly see athletes who have sustained a lower extremity injury
More informationdifferentiate between the various types of muscle contractions; describe the factors that influence strength development;
CHAPTER 6 Muscles at Work After completing this chapter you should be able to: differentiate between the various types of muscle contractions; describe the factors that influence strength development;
More informationp< e-mail: m.abbaszadeh@mubabol.ac.ir strain gauge (repeatability) (accuracy) SG110 EMG SENIAM ASIS Biodex Medical System, Inc., Shirley, New York, Drouin Biometrics (EMG) DataLog RMS Band pass filter:
More informationBiomechanics of Skeletal Muscle and the Musculoskeletal System
Biomechanics of Skeletal Muscle and the Musculoskeletal System Hamill & Knutzen (Ch 3) Nordin & Frankel (Ch 5), or Hall (Ch. 6) Muscle Properties Ø Irritability Ø Muscle has the capability of receiving
More informationMENISCAL REPAIR WITH WEIGHT RESTRICTIONS CLINICAL PRACTICE GUIDELINES
MENISCAL REPAIR WITH WEIGHT RESTRICTIONS CLINICAL PRACTICE GUIDELINES Progression is time and criterion-based, dependent on soft tissue healing, patient demographics and clinician evaluation. Contact Ohio
More informationperformance in young jumpers
BIOLOGY OF EXERCISE VOLUME 5.2, 2009 Isokinetic muscle strength and running long jump performance in young jumpers D.O.I: http:doi.org/10.4127/jbe.2009.0030 YIANNIS KOUTSIORAS, ATHANASIOS TSIOKANOS, DIMITRIOS
More information***Note: Figures may be missing for this format of the document ***Note: Footnotes and endnotes indicated with brackets
Isokinetic Strength of the Trunk and Hip in Female Runners By: Laurie L. Tis, MEd, ATC *, David H. Perrin, PhD, ATC, David B. Snead, PhD, Arthur Weltman University of Virginia and Washington University
More informationBARBELL HIP THRUST. Eckert, RM 1 and Snarr, RL 1,2
Eckert, RM and Snarr, RL. Barbell hip thrust. J Sport Human Perf 2014;2(2):1-9. DOI: 10.12922/jshp.0037.2014 1 SHORT REPORT BARBELL HIP THRUST OPEN ACCESS Eckert, RM 1 and Snarr, RL 1,2 1 School of Nutrition
More informationAnterior Tibial Translation During Progressive Loading of the ACL-Deficient Knee During Weight-Bearing and Nonweight-Bearing Isometric Exercise
Anterior Tibial Translation During Progressive Loading of the ACL-Deficient Knee During Weight-Bearing and Nonweight-Bearing Isometric Exercise H. john Yack, PhD, PT, 01' lias M. Riley, BS, ATC, PAC2 Terry
More informationAnterior Cruciate Ligament Rehabilitation. Rehab Summit Omni Orlando Resort at ChampionsGate Speaker: Terry Trundle, PTA, ATC, LAT
Anterior Cruciate Ligament Rehabilitation Rehab Summit Omni Orlando Resort at ChampionsGate Speaker: Terry Trundle, PTA, ATC, LAT ACL Graft Selection 1. Autograft Bone-Patella Tendon Bone Hamstrings: Semitendinosus
More informationCSEP-Certified Certified Personal Trainer (CSEP-CPT) CPT) Musculoskeletal Fitness Theory
CSEP-Certified Certified Personal Trainer (CSEP-CPT) CPT) Musculoskeletal Fitness Theory 1 Basic Anatomy Key Concepts: 3.23-3.25 3.25 2 Force & Levers 1 st class» seesaw» muscles that extend neck R F AF
More informationWhen are athletes ready for return to sports??? Functional Testing for Return to Sports. Important Factors Involved in Return to Sport
Functional Testing for Return to Sports Meg Jacobs PT Momentum Physical Therapy and Sports Rehab Mjacobs@wegetyouhealthy.com When are athletes ready for return to sports??? Post ACL reconstruction, average
More informationTREATMENT GUIDELINES FOR GRADE 3 PCL TEAR
GENERAL CONSIDERATIONS Posterior cruciate ligament (PCL) injuries occur less frequently than anterior cruciate ligament (ACL) injuries, but are much more common than previously thought. The PCL is usually
More informationTest-Retest Reliability of the Lateral Step-up Test in Young Adult Healthy Subjects
Test-Retest Reliability of the Lateral Step-up Test in Young Adult Healthy Subjects Capt Michael Ross, MSEd, PT' linicians often assess muscular performance in order to determine an individual's level
More informationObesity is associated with reduced joint range of motion (Park, 2010), which has been partially
INTRODUCTION Obesity is associated with reduced joint range of motion (Park, 2010), which has been partially attributed to adipose tissues around joints limiting inter-segmental rotations (Gilleard, 2007).
More informationD: there are no strength gains typically at this early stage in training
Name: KIN 410 Final Motor Control (B) units 6, + FALL 2016 1. Place your name at the top of this page of questions, and on the answer sheet. 2. Both question and answer sheets must be turned in. 3. Read
More informationA descriptive profile of age-specific knee extension flexion strength in elite junior tennis players
728 ORIGINAL ARTICLE A descriptive profile of age-specific knee extension flexion strength in elite junior tennis players Todd S Ellenbecker, E Paul Roetert, Tetsuro Sueyoshi, Scott Riewald... Br J Sports
More informationWarm-Up and Stretching Exercises
Warm-Up and Stretching Exercises Most athletes (swimmers included) use a combination of controlled movement exercises and specific joint/muscle stretching to improve performance potential. The proposed
More informationRelationship between Selected Physical Characteristics and Functional Capacity in the Anterior Cruciate Ligament-Insufficient Athlete
Relationship between Selected Physical Characteristics and Functional Capacity in the Anterior Cruciate Ligament-Insufficient Athlete By: Scott M. Lephart, PhD, ATC *, David H. Perrin, PhD, ATC, Freddie
More informationRehabilitation Guidelines for Anterior Cruciate Ligament (ACL) Reconstruction
Rehabilitation Guidelines for Anterior Cruciate Ligament (ACL) Reconstruction The knee is the body's largest joint, and the place where the femur, tibia, and patella meet to form a hinge-like joint. These
More informationCAN TRAINING IMPROVE YOUR ABILITY TO CO-CONTRACT? Jordan Yurchevich. St. Francis Xavier University. October 9, 2006
CAN TRAINING IMPROVE YOUR ABILITY TO CO-CONTRACT? Jordan Yurchevich 200306793 St. Francis Xavier University October 9, 2006 1 Introduction The aim of the present study is to determine whether or not training
More informationABDOMINAL MUSCLE ACTIVATION IN TWO TRUNK-CURL TESTS
ABDOMINAL MUSCLE ACTIVATION IN TWO TRUNK-CURL TESTS D. Knudson' and D. Johnston Z 'California State University, Chico, CA, USA zbaylor University, Waco, TX USA INTRODUCTION Health-related fitness test
More informationLifting your toes up towards your tibia would be an example of what movement around the ankle joint?
NAME: TEST 1 ANATOMY IN SPORT SCIENCE: SEMESTER 1, 2017 TOTAL MARKS = 58 Total: / 58 marks Percentage: Grade: TERMINOLOGY: The structures that connect bone to bone are called: The ankle joint is to the
More informationMuscular Strength and Endurance:
PE 1- Assignment #5 6 1 Name: Per: Date: Teacher: STRESS BREAK Participating in physical activities that improve your self-esteem is a great way to deal with stress. The better you feel about yourself,
More informationGender Differences in the Activity and Ratio of Vastus Medialis Oblique and Vastus Lateralis Muscles during Drop Landing
Original Article Gender Differences in the Activity and Ratio of Vastus Medialis Oblique and Vastus Lateralis Muscles during Drop Landing J. Phys. Ther. Sci. 21: 325 329, 2009 MIN-HEE KIM 1), WON-GYU YOO
More informationLifting your toes up towards your tibia would be an example of what movement around the ankle joint?
NAME: TEST 1 ANATOMY IN SPORT SCIENCE: SEMESTER 2, 2016 TOTAL MARKS = 72 Total: /72 marks Percentage: Grade: TERMINOLOGY: The structures that connect bone to bone are called: The hip joint is to the shoulder
More informationRole of Body and Joint Position on lsokinetic Exercise and Testing
Journal of Sport Rehabilitation, 1993, 2, 141-1 49 O 1993 Human Kinetics Publishers, Inc. Role of Body and Joint Position on lsokinetic Exercise and Testing Donna D. Smith This paper reviews the role of
More informationBiomechanics of Skeletal Muscle and the Musculoskeletal System
Biomechanics of Skeletal Muscle and the Musculoskeletal System Hamill & Knutzen (Ch 3) Nordin & Frankel (Ch 5), or Hall (Ch. 6) Muscle Properties 1 Muscle Properties (cont.) Functions of Muscle Produce
More informationLooped Band Placed Around Thighs Increases EMG of Gluteal Muscles Without Hindering Performance During Squatting
Journal of Performance Health Research Volume 1, Issue 1. Pages 60 71 DOI: 10.25036/jphr.2017.1.1.sprakin 2017 Performance Health www.performancehealthresearch.com Original Research OPEN ACCESS Looped
More informationISOKINETIC TESTING AND DATA INTERPRETATION
ISOKINETIC TESTING AND DATA INTERPRETATION PRINCIPLES OF ISOKINETIC The principle behind Isokinetic exercise and testing is that the lever arm moves at a preset fixed speed allowing for accommodating resistance
More informationFunctional Movement Screen (Cook, 2001)
Functional Movement Screen (Cook, 2001) TEST 1 DEEP SQUAT Purpose - The Deep Squat is used to assess bilateral, symmetrical, mobility of the hips, knees, and ankles. The dowel held overhead assesses bilateral,
More informationSkeletal Muscles and Functions
Skeletal Muscles and Functions Huei-Ming Chai, PT, Ph.D. School of Physical Therapy National Taiwan University Classification of Muscles striated muscles skeletal muscles: voluntary contraction cardiac
More informationElectromyographic Activity Recorded from an Unexercised Muscle During Maximal Isometric Exercise of the Contralateral Agonists and Antagonists
Electromyographic Activity Recorded from an Unexercised Muscle During Maximal Isometric Exercise of the Contralateral Agonists and Antagonists KATHLEEN L. DEVINE, MS, BARNEY F. LeVEAU, PhD, and H. JOHN
More informationQuads (machines) Cable Lunge
Cable Lunge Cable Lunge 1) Stand with feet hip width apart and a cable attached around your waist. Take left leg and step back approximately 2 feet standing on the ball of the foot. 2) Start position:
More informationMuscle strength imbalances and injuries
Muscle strength imbalances and injuries Joaquim Chaler PM&R department. Egarsat-SUMA.Terrassa, Barcelona Lecturer. Psicology, Education and Sports Science School Blanquerna. Universitat Ramon Llull. Barcelona
More informationEccentric and Concentric Force-Velocity Relationships of the Quadriceps Femoris Muscle
Eccentric and Concentric Force-Velocity Relationships of the Quadriceps Femoris Muscle Nancy M. Cress, MS, PT' Kristin S. Peters, MS, PT2 \die M. Chandler, MS, PT3 unctional activity involves patterns
More informationExercise Highlight REVERSE LUNGE TO PLYOMETRIC SPRINTER-START
Exercise highlight: Reverse lunge to plyometric sprinter-start. J. Aust. Strength Cond. 21(4)5-13. 2013 ASCA. Exercise Highlight REVERSE LUNGE TO PLYOMETRIC SPRINTER-START Ronald L. Snarr, M.Ed., CSCS,
More informationPower. Introduction This power routine is created for men and women athletes or advanced trainers, and should not be completed by beginners.
Power Power Introduction This power routine is created for men and women athletes or advanced trainers, and should not be completed by beginners. Power and plyometrics routines focus on explosive movements
More informationThe Biomechanics of Human Skeletal Muscle
AML2506 Biomechanics and Flow Simulation Day 03B The Biomechanics of Human Skeletal Muscle Session Speaker Dr. M. D. Deshpande 1 Session Objectives At the end of this session the delegate would have understood
More informationRelative Isometric Force of the Hip Abductor and Adductor Muscles
Relative Isometric Force of the Hip Abductor and Adductor Muscles WARREN W. MAY, Captain, AMSC A-LTHOUGH THE CONCEPT of the muscular force curve is not new, its clinical application has been generally
More informationDynamic Bracing for ACLD and ACLR Knees. Gary R. Bledsoe, L.O. Vice President Research and Development
Dynamic Bracing for ACLD and ACLR Knees Gary R. Bledsoe, L.O. Vice President Research and Development Table of Contents Introduction 1 Problems of ACLD & ACLR Knees 2 Previous Options 3 Dynamic Knee Bracing
More informationKnee Injuries. PSK 4U Mr. S. Kelly North Grenville DHS. Medial Collateral Ligament Sprain
Knee Injuries PSK 4U Mr. S. Kelly North Grenville DHS Medial Collateral Ligament Sprain Result from either a direct blow from the lateral side in a medial direction or a severe outward twist Greater injury
More informationchapter Plyometric Training
chapter 18 Plyometric Training Chapter Objectives Explain the physiology of plyometric exercise. Identify the phases of the stretch-shortening cycle. Identify components of a plyometric training program.
More informationRETURN TO SPORT PROTOCOL CO.RE
RETURN TO SPORT PROTOCOL CO.RE WHO CAN USE THIS PROGRAM This protocol is designed as a return to sport program following anterior cruciate ligament reconstruction but applies equally well to rehabilitation
More informationDAY 2 III. WORKOUT RULES
DAY 2 III. WORKOUT RULES A. Order of Exercise 1. Largest amount of muscle mass to smallest amount of muscle mass, eg., squats -- calf raises 2. Complex exercise to assisting, eg., squats -- leg ext. 3.
More informationAnterior Cruciate Ligament (ACL) Injury Prevention Program at St. Charles Hospital. St.Charles. Sports Medicine
Anterior Cruciate Ligament (ACL) Injury Prevention Program at St. Charles Hospital St.Charles Sports Medicine 200 Belle Terre Road Port Jefferson New York 11777 (631) 474-6797 www.stcharles.org www.stcharles.org
More informationT he anterior cruciate ligament (ACL) is a complex three
126 ORIGINAL ARTICLE Effect of verbal instructions on muscle activity and risk of injury to the anterior cruciate ligament during landing E J Cowling, J R Steele, P J McNair... See end of article for authors
More informationChapter 14 Training Muscles to Become Stronger
Chapter 14 Training Muscles to Become Stronger Slide Show developed by: Richard C. Krejci, Ph.D. Professor of Public Health Columbia College 11.22.11 Objectives 1. Describe the following four methods to
More informationOutline. Training Interventions for Youth Baseball Athletes. 3 Rehabilitation Focus Points. What Training to Perform?
Outline Training Interventions for Youth Baseball Athletes Tim L. Uhl PhD ATC PT FNATA Division of Athletic Training Department of Rehabilitation Sciences College of Health Sciences University of Kentucky
More informationDifferences in the movement pattern of a forward lunge in two types of anterior cruciate ligament deficient patients: copers and non-copers
Clinical Biomechanics 17 (2002) 586 593 www.elsevier.com/locate/clinbiomech Differences in the movement pattern of a forward lunge in two types of anterior cruciate ligament deficient patients: copers
More informationNeuromuscular Response to Cyclic Loading of the Anterior Cruciate Ligament
Neuromuscular Response to Cyclic Loading of the Anterior Cruciate Ligament Paola Sbriccoli,* MD, PhD, Moshe Solomonow,* PhD, MD(Hon), Bing-He Zhou,* EE, Yun Lu,* MD, and Robert Sellards,* MD From the *Occupational
More informationP3 Week One - M-W-F Workout Routine:
P3 Week One - M-W-F Workout Routine: P3 Week One - M-W-F Workout Routine: Circuit Training Exercises Side Deltoid Raise w/ band Triceps Extensions Ball Pushups: Ball Squat: (hold dumbbells on your side
More informationMuscular Considerations for Movement. Kinesiology RHS 341 Lecture 4 Dr. Einas Al-Eisa
Muscular Considerations for Movement Kinesiology RHS 341 Lecture 4 Dr. Einas Al-Eisa Role of muscles Prime mover Synergist Agonist Antagonist Stabilizers Neutralizers Role of muscles Agonist: Muscles producing
More informationComparison of Weight-Bearing and Non-Weight-Bearing Conditions on Knee Joint Reposition Sense
Comparison of Weight-Bearing and Non-Weight-Bearing Conditions on Knee Joint Reposition Sense By: Michael J. Higgins and David H. Perrin Higgins, M.J., Perrin, D.H. (1997). Comparison of weight bearing
More informationACL Rehabilitation and Return To Play
ACL Rehabilitation and Return To Play Seth Gasser, MD Director of Sports Medicine Florida Orthopaedic Institute Introduction Return to Play: the point in recovery from an injury when a person is safely
More informationACL REHAB. Steve Sanchez, PT, OCS, Cert MDT
ACL REHAB Steve Sanchez, PT, OCS, Cert MDT Objectives Problems with the stiff ACL knee Importance of full knee extension early Identify loads during common exercises and activities Describe exs to achieve
More informationRN(EC) ENC(C) GNC(C) MN ACNP *** MECHANISM OF INJURY.. MOST IMPORTANT *** - Useful in determining mechanism of injury / overuse
HISTORY *** MECHANISM OF INJURY.. MOST IMPORTANT *** Age of patient Sport / Occupation - Certain conditions are more prevalent in particular age groups (Osgood Schlaters in youth / Degenerative Joint Disease
More informationEffect of a Lateral Step-up Exercise Protocol
Effect of a Lateral Step-up Exercise Protocol on Quadriceps and Lower Extremity Performance Teddy W. Worrell, EdD, PT, SCS, ATC' Bonnie Borchert, MS, PT, ATC2 Kristi Erner, MS, PT2 /die Fritz, MS, PT,
More informationEffect of Horizontal Support on Abdominal Muscle Activation and Load During a Vertical Chest Press Exercise on a Dual Adjustable Pulley Apparatus
Effect of Horizontal Support on Abdominal Muscle Activation and Load During a Vertical Chest Press Exercise on a Dual Adjustable Pulley Apparatus D.S. Peckinpaugh C.T. Guzell Department of Kinesiology
More informationInvestigation of Human Whole Body Motion Using a Three-Dimensional Neuromusculoskeletal Model
Investigation of Human Whole Body Motion Using a Three-Dimensional Neuromusculoskeletal Model 1 Akinori Nagano, 2 Senshi Fukashiro, 1 Ryutaro Himeno a-nagano@riken.jp, fukashiro@idaten.c.u-tokyo.ac.jp,
More informationBy: TEDDY W. WORRELL, MEd, PT, ATC, CRAID R. DENEGAR, PhD, ATC, SUSAN L. ARMSTRONG, MEd, ATC, and DAVID H. PERRIN, PhD, ATC
Effect of Body Position on Hamstring Muscle Group Average Torque By: TEDDY W. WORRELL, MEd, PT, ATC, CRAID R. DENEGAR, PhD, ATC, SUSAN L. ARMSTRONG, MEd, ATC, and DAVID H. PERRIN, PhD, ATC Worrell, T.W.,
More informationLower Extremity Physical Performance Testing. Return to Function (Level I): Core Stability
Physical performance testing is completed with patients in order to collect data and make observations regarding the overall function of the limb integrated into the entire functional unit of the body,
More informationGOLFERS TEN PROGRAM 1. SELF STRETCHING OF THE SHOULDER CAPSULE
GOLFERS TEN PROGRAM 1. SELF STRETCHING OF THE SHOULDER CAPSULE POSTERIOR CAPSULAR STRETCH Bring your arm across your chest toward the opposite shoulder. With the opposite arm grasp your arm at your elbow.
More informationThe Golfers Ten Program. 1. Self Stretching of the Shoulder Capsule
The Golfers Ten Program 1. Self Stretching of the Shoulder Capsule A. Posterior capsular stretch Bring your arm across your chest toward the opposite shoulder. With the opposite arm grasp your arm at your
More informationCONTROL OF THE BOUNDARY CONDITIONS OF A DYNAMIC KNEE SIMULATOR
CONTROL OF THE BOUNDARY CONDITIONS OF A DYNAMIC KNEE SIMULATOR J. Tiré 1, J. Victor 2, P. De Baets 3 and M.A. Verstraete 2 1 Ghent University, Belgium 2 Ghent University, Department of Physical Medicine
More informationNeither Stretching nor Postactivation Potentiation Affect Maximal Force and Rate of Force Production during Seven One-Minute Trials
Neither Stretching nor Postactivation Potentiation Affect Maximal Force and Rate of Force Production during Seven One-Minute Trials David M. Bazett-Jones Faculty Sponsors: Jeffery M. McBride & M. R. McGuigan
More informationIsokinetic Evaluation of Internal/External Tibial Rotation Strength After the Use of Hamstring Tendons for Anterior Cruciate Ligament Reconstruction
Isokinetic Evaluation of Internal/External Tibial Rotation Strength After the Use of Hamstring Tendons for Anterior Cruciate Ligament Reconstruction Tanya Armour,* PhD, Lorie Forwell, MSc, PT, Robert Litchfield,
More informationACTIVITY TYPE. Stretching COACHING RESOURCE
ACTIVITY TYPE Stretching 161 Stretching, Warm-up and Cool-down A regular stretching, warm-up and cool-down routine is an essential component of any athlete s program no matter what their age or competition
More informationMuscular Training This is a sample session for strength, endurance & power training exercises
Muscular Training This is a sample session for strength, endurance & power training exercises Presenter: Leslie McAdam CCAA Trainer Education Coordinator lbrown59@uwo.ca 519-661-1607 1-866-661-1603 X81607
More informationAnterior Cruciate Ligament (ACL) Reconstruction Protocol. Hamstring Autograft, Allograft, or Revision
Anterior Cruciate Ligament (ACL) Reconstruction Protocol Hamstring Autograft, Allograft, or Revision As tolerated should be understood to perform with safety for the reconstruction/repair. Pain, limp,
More informationCHAPTER 1: 1.1 Muscular skeletal system. Question - text book page 16. Question - text book page 20 QUESTIONS AND ANSWERS. Answers
QUESTIONS AND ANSWERS CHAPTER 1: 1.1 Muscular skeletal system Question - text book page 16 Using the information on pages 12 to 14 above, complete the table below. joint joint type articulating bones associated
More informationClinical Use of the Johnson Anti-Shear Device: How and Why to Use It
0196-6011 /86/0706-0304$02.00/0 THE JOURNAL OF ORTHOPAEDIC AND SPORTS PHYSICAL THERAPY Copyr~ght 8 1986 by The Orthopaedic and Sports Physical Therapy Sections of the American Physical Therapy Association
More informationRe-establishing establishing Neuromuscular
Re-establishing establishing Neuromuscular Control Why is NMC Critical? What is NMC? Physiology of Mechanoreceptors Elements of NMC Lower-Extremity Techniques Upper-Extremity Techniques Readings Chapter
More informationAnterior Cruciate Ligament Hamstring Rehabilitation Protocol
Anterior Cruciate Ligament Hamstring Rehabilitation Protocol Focus on exercise quality avoid overstressing the donor area while it heals. Typically, isolated hamstring strengthening begins after the 6
More informationMENTOR METHOD OF TRAINING
MENTOR METHOD OF TRAINING When trying to improve performance on the field of play or on the court, whatever your sport, it is important that you understand where it all begins. For an athlete there are
More informationQuads (medicine ball)
Saggital Front Reach Saggital Front Reach 1) Start position: Stand with feet hip width apart. Hold medicine ball or dumbbell at waist. 2) Step forward 2-3 feet with the heel striking first and lean torso
More informationA Comparison of the Immediate Effects of Eccentric Training vs Static Stretch on Hamstring Flexibility in Basketball Players Dr.
A Comparison of the Immediate Effects of Eccentric Training vs Static Stretch on Hamstring Flexibility in Basketball Players Dr. Mandeep Thour* *Assistant Professor, Department of Physical Education SGGS
More informationIsometric Knee Extension Strength as a Function of Joint Angle, Muscle Length and Motor Unit Activity
Acta Orthopaedica Scandinavica ISSN: 0001-6470 (Print) (Online) Journal homepage: http://www.tandfonline.com/loi/iort19 Isometric Knee Extension Strength as a Function of Joint Angle, Muscle Length and
More informationCHANGES IN LOWER-LIMB MUSCLE FORCES WITH PROPHYLACTIC KNEE BRACING DURING LANDING AND STOP-JUMP TASKS
CHANGES IN LOWER-LIMB MUSCLE FORCES WITH PROPHYLACTIC KNEE BRACING DURING LANDING AND STOP-JUMP TASKS Katie Ewing 1, Rezaul Begg 2, Peter Lee 1 Department of Mechanical Engineering, University of Melbourne,
More informationChapter 20: Muscular Fitness and Assessment
Chapter 20: Muscular Fitness and Assessment American College of Sports Medicine. (2010). ACSM's resource manual for guidelines for exercise testing and prescription (6th ed.). New York: Lippincott, Williams
More informationAnterior Cruciate Ligament (ACL) Rehabilitation
Thomas D. Rosenberg, M.D. Vernon J. Cooley, M.D. Anterior Cruciate Ligament (ACL) Rehabilitation Dear Enclosed you will find a copy of our Anterior Cruciate Ligament (ACL) Rehabilitation program and the
More information