INTRODUCTION: BACKGROUND

Transcription

1 BACKGROUND A 150-pound adult has about 5.5 liters of blood on average, which the heart circulates about three times every minute. A person's heart is continuously beating to keep the blood circulating. Heart health experts say that the best ways to keep our hearts healthy is through a balanced diet, avoiding smoking and regular exercise. Exercise that is good for your heart should elevate your heart rate. But by how much, for how long and how often should your heart rate be elevated? This has to do with how fit you are and your maximum heart rate, which, for adults, is about 220 beats per minute (bpm) minus your age. For example, if you are 30 years old, your maximum heart rate would be 190 bpm. The American Heart Association (AHA) recommends doing exercise that increases a person's heart rate to between 50 to 85 percent of their maximum heart rate. This range is called the target heart rate zone. The AHA recommends a person gets at least 30 minutes of moderate to vigorous exercise exercise that elevates their heart rate to the target heart rate zone on most days of the week, or a total of about 150 minutes a week. INTRODUCTION: Have you ever wondered how many times your heart beats in a day, a month, a year or will beat in total throughout your life? Over an average lifetime, the human heart beats more than 2.5 billion times. For a person to keep their heart healthy, they should eat right, not smoke and get regular exercise. In this science activity, you'll measure your heart rate during different types of physical activities to find out which gives your heart the best workout to help keep it fit. A normal resting heart rate for adult s ranges from 60 to 100 beats a minute. Generally, a lower heart rate at rest implies more efficient heart function and better cardiovascular fitness. For example, a well-trained athlete might have a normal resting heart rate closer to 40 beats a minute.

2 To measure your heart rate, simply check your pulse. Place your index and third fingers on your neck to the side of your windpipe. To check your pulse at your wrist, place two fingers between the bone and the tendon over your radial artery which is located on the thumb side of your wrist. When you feel your pulse, count the number of beats in 15 seconds. Multiply this number by 4 to calculate your beats a minute. Keep in mind that many factors can influence heart rate, including: Activity level Fitness level Air temperature Body position (standing up or lying down, for example) Emotions Body size Medications Although there's a wide range of normal, an unusually high or low heart rate may indicate an underlying problem. Consult your doctor if your resting heart rate is consistently above 100 beats a minute (tachycardia) or if you're not a trained athlete and your resting heart rate is below 60 beats a minute (bradycardia) especially if you have other signs or symptoms, such as fainting, dizziness or PURPOSE: In this lab, you will design an experiment to determine the average resting heart rate, exercise heart rate, and post exercise heart rate of your classmates. Using the Vernier Labquest 2 and the Handgrip heart rate monitor, you will use Bio-Technology equipment. OBJECTIVES: 1. Familiarization of the Vernier technology. 2. Obtain various heart rates of your classmates, collect the data, graph the data, analyze it, and determine the averages of your team and the class. 3. You will be using Google documents and Google Spreadsheet to collect and graph data. HYPOTHESIS: If I do this, then this will happen. Write your hypothesis here: VARIABLES: What are the variables in this experiment. Independent Variable: Dependent Variable: Constant (or Control Variable)

3 EQUIPMENT/MATERIALS: Vernier Labquest 2 Vernier Handgrip Heart Rate Monitor Computer Google Spreadsheet High School Track LAB SETUP: 1. Log onto a laptop. The Heart Rate Lab Document will be shared with you by Mr. Hanson. In your google drive, open the document, click on file, then make a copy. Name the document Investigating Heart Rate Lab, your names, Team #, and period number. Share this document with your partners, and christopher.hanson@student.dodea.edu 2. All of your data, observations, analysis, and conclusions will be written on your Lab Document in your Google Drive. 3. LABQUEST 2: Look at LabQuest 2 and Handgrip Heart Rate Monitor connections. Mr. Hanson will show you how to connect to Channel 1 on the computer. You will turn on the LabQuest 2 during the procedures below. Do not turn on at this time, only when you are collecting data on Heart Rate. a. Once you hook up the Heart Rate Monitor and begin collecting data, you will need to wait about 15 seconds for your heart rate to display. b. Remember to be very careful with the Labquest equipment as it is very fragile. c. Once you are finished with the Labquest equipment, you will go through shut down procedures. PROCEDURES: 1. Throughout this experiment, write down your observations below. 2. Insure that you also write down your data that you collect for each of your teammates using a pen and piece of paper initially, then transferring that data to the data table below. 3. In the classroom, collect the resting heart rate using the Handgrip Heart Rate Monitor for each teammate. You will need to place that data in your data table below. 4. On the track or in the gym, for each of your teammates, you will need to run one lap around the track (2 laps if in the gym), immediately after you are finished, you will need to immediately take the exercise heart rate using the monitor. You will need to place that date in your data table below. 5. After you take the exercise heart rate, using your watch (stopwatch), you will need to wait 7 minutes before you take the post exercise heart rate for each of your teammates. Take it, and place the date in your data table below. OBSERVATIONS: Write your observations here. Observations include writing the names of each teammate, and focusing your observations on how they feel, describe their physical state before, during, and after exercise.

4 DATA TABLE: Put and * next to the member of your team. Use only the data for your team. Student Name Resting HR (Take for 2 minutes lowest HR) Exercise Peak HR (Immediately after Exercise) Post Exercise HR (After 7 minutes) Control: Mr. Hanson will be Resting at all times ANALYZE DATA: Write an analysis of your data here what does the data tell you and what does it mean? 1. Take the data from your data table and make three graphs using Google Spreadsheet. Mr. Hanson will show you how to use this program in class. 2. One graph for Resting HR, one for Peak Exercise HR, and one for Post Exercise HR. 3. Look at the data for each of your teammates, what does it tell you? Write that analysis here. Analysis: CONCLUSION: 1. What does this experiment tell you about Heart Rate in Human beings? Write your answer here: 2. Go online and find three mammals resting heart rate. Select one large mammal, one medium size, and one very small. Compare the heart rates of three mammals with the human resting heart rate. List the names of those mammals and their heart rate. What does this data tell you about the heart rate of mammals, of which classification we belong. Write your answers here:

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