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Heart Rate
1. What is Your Heart Rate?Exploring Numerical Data Erica Seals Fall 2009 Education 373
2. Science Standard 2: Scientific Thinking Indicator 4.2.4: Use numerical data to describe and compare objects and events. Taken from: http://dc.doe.in.gov/Standards/AcademicStandards/StandardSearch.aspx Link to activity: http://www.indianastandardsresources.org/files/sci/sci_4_2_4.pdf
3. Definitions Data: Individual facts or items of information Describe: To give an account of in speech or writing. Compare: To examine in order to note similarities or differences. Heart rate: The number of heart beats per minute. http://www.dictionary.com/ http://www.thefreedictionary.com/
4. Purpose Students will use their observations and numerical data to describe and compare their heart rates before and after exercise.
5. Communication Ask students questions: Have you ever felt your heart race after you have exercised? Activity Have students predict which heart rate will be faster: before or after exercise? Have students run in place for 30 seconds. How much faster is your heart beating now than it was before? Inform students that they will soon learn to measure and accurately compare their heart rates using numerical data.
6. Group Practice Demonstrate how to find your pulse. Have students practice. Have students count their heart beats for 30 seconds. Explain Students can find their heart rates by multiplying the number of heartbeats for 30 seconds by two. http://myhealth.ucsd.edu/library/healthguide/en-us/images/media/medical/hw/hwkb17_071.jpg
7. Gathering Data Divide students into groups of three or four. Timer- uses stopwatch to time heart beat Heart Beater- counts pulse before and after exercise Recorder- writes down results Distribute stopwatches and What Is Your Heart Rate handouts to each group. Students take turns being the timer/heart beater/recorder and complete the handout. http://www.defencejobs.gov.au/fitness/images/img_stopWatch.jpg
8. Directions 1. Heart Beater – find your pulse. When the Timer starts the stopwatch, count how many times your heart beats while you are sitting still. The Timer will stop you at 30 seconds. The Recorder will record the number of heart beats. 2. Next, the Heart Beater will run in place for 1 minute while the Timer times him/her. 3. After the run, the Heart Beater will take his/her pulse again, while the Timer times him/her for 30 seconds. 4. The Recorder will record the number of heart beats and the group will calculate the heart rates. 5. Trade jobs so that each person has a chance to be the Heart Beater. http://www.indianastandardsresources.org/files/sci/sci_4_2_4.pdf
10. Describe the Data Ask students to share their resting and exercising heart rates. Question: “Was your exercise heart rate higher or lower than your resting heart rate?” Challenge students to explain the difference between the two heart rates.
11. Summary What was your resting heart rate? What was your exercise heart rate? What is the difference between your resting heart rate and your exercise heart rate? How did you measure each heart rate? Why do you think there is a difference between your resting heart rate and your exercise heart rate?
