Muscle strength imbalances and injuries
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1 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
2 Overload injury vicious cycle Musculotendinous tensile overload Tissue injury Micro and/or macrotears Clinical symptoms Pain Instability Disfunction Decreased performance functional biomechanical deficits Muscular weakness Inflexibility Scar tissue Muscle strength imbalance Sublinical adaptations Healing Return to participation Kibler WB, Chandler TJ, Pace BK. Principles of rehabilitation after chronic tendon injuries. Clin Sports Med 11:663, 1992
3 Muscle imbalance Failure of the agonist-antagonist relation when agonistic/antagonistic muscle groups function cooperativelly to control the joints that they cross. Sahrmann, 1987 Caillet, 1977
4 Muscle strenth imbalance and injuries Throwers or tennis players: rotator cuff injuries ER/IR muscle imbalances Greiwe RM et al Orthopedic Clin N Am 2010; 41 (3):
5 Knee injuries Hamstring injury Muscle imbalance (low H:Q ratio). Muscle fatigue Tighness Insufficient warm up Previous injury Petersen J, Holmich P.Br J Sports Med Jun;39(6): Croisier JL.Sports Med. 2004;34(10):
6 Reliable, valid, feasible and safe tool to evaluate dynamic muscle strength? Isokinetic dynamometry
7 Muscle imbalance assessment parmeters: Ratios Agonist / antagonist ratios Agonist conc / antagonist conc Agonist ecc / antagonist ecc Agonist ecc / antagonist conc (functional ratio) agonist ecc / conc ratios
8 Knee dynamic ratios Dvir Z, Eger G, Halperin N, Shklar A. Thigh muscle activity and anterior cruciate ligament insufficiency. Clinical Biomechanics, 4: 87-91, 1989 hamstring ecc /quadriceps conc The only ratio affected in defficient ACL. Aagaard P, Simonsen EB, Magnusson SP, Larsson B, Dyhre-Poulsen P. A new concept for isokinetic hamstring: quadriceps muscle strength ratio. Am J Sports Med Mar-Apr;26(2): the functional hamstring:quadriceps ratio detects better hamstring contribution to dynamic joint stability.
9 Shoulder dynamic ratios Wilk KE, et al. The strength characteristics of internal and external rotation muscles in professional baseball pitchers. Am J Sports Med 21: 61-66, 1993 ER ecc /IR conc David G et al. EMG and strength correlates of selected shoulder muscles during rotations of the glenohumeral joint. Clin Biomech 15: , 2000 ERconc/IRconc ratio is less relevant than ERecc/IRconc
10 Rahnama N, Lees A, Bambaecichi E. A comparison of muscle strength and flexibility between the preferred and non-preferred leg in English soccer players. Ergonomics, vol. 48: male soccer players Velocities: 60, 120 and 300º/s Positioning seated
11 Croisier JL, Crielaard JM. Hamstring muscle tear with recurrent complaints: an isokinetic profile. Isokinet Exerc Sci 2000; 8: Croisier JL, Forthomme B, Namurois M, Vanderthommen M, Creilaard JM. Hamstring muscle strain recurrence and strength performance disorders. Am J Sports Med. 2002;30:
12 Michelle R. Devan, et al. A Prospective Study of Overuse Knee Injuries Among Female Athletes With Muscle Imbalances and Structural Abnormalities. Journal of Athletic Training 2004;39(3): women (hockey, soccer and basketball) Sitting position Velocities 60 and 300º/s concentric MAIN FINDING Hamstring:quadriceps ratio overuse knee injury prediction value.
13 462 soccer players preseason evaluation Seated position Velocities 60 and 240º/s conc 30 and 120º/s ecc
14 MAIN FINDINGS Deficits and H:Q ratios (specially Hamstring ecc /quadriceps conc ) have hamstring injury predictive value. Individualized intervention and isokinetic test follow-up reduced injury incidence. Croisier et al, 2008
15 Knee muscle imbalances Author N Gender Sport Velocities Mode Results Yeung SS, m 9 f Sprinters 60,120,240 Conc Ecc H:Q conc ratio predicitive value Bojsen-Møller J, m 11 f Sailing 30, 240 Conc Ecc Lower H:Q ratio Bennell K, m Autralian football 60,180 Conc Ecc Not predict. Injury risk Forbes H, m Soccer 60 Conc Ecc Differences H:Q among ages
16 Gulick DT 2001 Side dominance does not affect dynamic control strength ratios in the shoulder. Isokinetics Exercise Science 9: Velocities: Positioning: Subjects n 90 and 120º/s Non-athletic 30 15M;16F Results: Vel / side ER ecc /IR conc 90º/s / Dom º/s / Dom º/s / non Dom º/s / non Dom 1.13
17 Noffal GJ 2003 Isokinetic Eccentric-to-Concentric Strength Ratios of the Shoulder Rotator Muscles in Throwers and Nonthrowers. Am J Sports Med 31: Velocities: Positioning: Subjects n 300º/s Baseball players (BP) 16 Non athletic (NA) 43 Results: Subject / side ER ecc /IR conc BP / Dom 1.17* BP / no Dom 1.48 NA / Dom 1.37 NA / no Dom 1.60
18 Bak K, Magnusson P 1997 Shoulder strength and range of motion in symptomatic and pain-free elite swimmers. Am J Sports Med 25: Velocities: Positioning: Subjects n 30º/s Elite swimmers 15 With shoulder pain 7 Without 8 9 M; 6 F Results: Ratio Injured Uninjured Control RE conc /RI conc 0.83* * RE ecc /RI ecc RE ecc /RI conc 1.08* 0.89* 0.86*
19 Shoulder ER/IR muscle imbalances Author N Gender Sport Velocities Mode Results Newsham KR, 1998 Michael JW, m Baseball 180,300,450 Conc No dominance effect m 15 f Handball 60,180 Conc No dominance effect Andrade S, f Handball 30,90,300 Conc Ecc Wong E, C 27NC 37 m 21 f Climbing 60 Conc Ecc Differences regarding dominance Climbers lower ER:IR Saccol MF, m 14f Edouard P, m Rugby (R) / non-athletic (NA) Tennis 60,180 Conc Ecc 60,240 Conc Ecc Dominance effect No Differences H:Q (R a NA)
20 8 former epicondylitis patients vs 8 healthy controls M E T H Dynamometer Biodex system 3 DFM and PFM 60º of Total ROM (20º of DF and 40º of PF) Positioning * * Forthomme B et al. Isokin Exerc Sci 2002 O D S ISOKINETIC TEST: Con test at 30 and 90º/sec (5 reps) Ecc test at 60º/sec (5 reps) Fatigue test Con at 60º/sec (until exhaustion)
21 R E S U L T S Dorsal flexor/palmar flexor (DF/PF) ratios Patients Controls p DF/PF ratio Con 90º/sec 0.39± ±0.19 0,731 DF/PF ratio Con 30º/sec 0.41± ±0.14 0,042 DF/PF ratio Ecc 60º/sec 0.42± ±0.20 0,013
22 Key points Muscle imbalances are probably one of the main biomechanical deficit related to musculoskeletal injury Isokinetic assessment of imbalances has provided valid data to predict injury and assess hamstring injury treatment and prevention programs in soccer players. However, isokinetic dynamometry use in muscle imbalances assessment is not generalized in sports/musculoskeletal settings. Beyond isokinetic devices availability, protocol and results variability may be a cause. Further research is needed pertaining female sports participants, joints and sportive activities not yet tested. Practice guidelines for clinicians would be highly welcome.
23 Research Project Muscle imbalances and thightness assessment around the knee joint Male and female elite hockey players Relationship with previous injuries and prospective analysis of new injuries.
24
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