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Health Grade 6-8 Answer Key

Health: Fitness Data: Heart Rate Zones and Recovery

Use heart rate data to understand exercise intensity and recovery

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Health: Fitness Data: Heart Rate Zones and Recovery

Use heart rate data to understand exercise intensity and recovery

Health - Grade 6-8

Instructions: Read each problem carefully. Use the formulas and data provided. Show your work in the space provided.
  1. 1

    A common estimate for maximum heart rate is 220 minus age. Maya is 12 years old. What is her estimated maximum heart rate?

    Subtract Maya's age from 220.

    Maya's estimated maximum heart rate is 208 beats per minute because 220 - 12 = 208.
  2. 2

    Use Maya's estimated maximum heart rate of 208 beats per minute. Her moderate zone is 50% to 70% of her maximum heart rate. What is her moderate zone range? Round to the nearest whole number.

    Maya's moderate zone is about 104 to 146 beats per minute because 50% of 208 is 104 and 70% of 208 is 145.6, which rounds to 146.
  3. 3

    A fitness tracker shows Jordan's heart rate during a workout: 92, 118, 135, 158, and 122 beats per minute. Which reading is the highest intensity moment?

    Find the greatest number in the list.

    The highest intensity moment is 158 beats per minute because it is the largest heart rate reading in the set.
  4. 4

    A student's target heart rate zone for vigorous activity is 150 to 180 beats per minute. During soccer practice, their heart rate is 162 beats per minute. Is the student in the vigorous zone?

    Yes, the student is in the vigorous zone because 162 beats per minute is between 150 and 180 beats per minute.
  5. 5

    Lina checks her heart rate right after jogging and again one minute later. Right after jogging, it is 168 beats per minute. One minute later, it is 132 beats per minute. How much did her heart rate decrease?

    Subtract the one-minute heart rate from the heart rate right after jogging.

    Lina's heart rate decreased by 36 beats per minute because 168 - 132 = 36.
  6. 6

    Recovery heart rate is how much the heart rate drops after exercise. A larger drop during the first minute often shows better recovery. Student A drops from 170 to 140 beats per minute. Student B drops from 165 to 150 beats per minute. Which student had the larger one-minute recovery drop?

    Student A had the larger one-minute recovery drop. Student A dropped 30 beats per minute, while Student B dropped 15 beats per minute.
  7. 7

    Use this zone guide: light activity is 50% to 60% of maximum heart rate, moderate activity is 60% to 70%, vigorous activity is 70% to 85%, and near maximum is 85% to 100%. A student has a maximum heart rate of 200 beats per minute and is exercising at 150 beats per minute. What percent of maximum heart rate is this, and which zone is it?

    Divide the exercise heart rate by the maximum heart rate, then multiply by 100.

    The student is exercising at 75% of maximum heart rate because 150 divided by 200 equals 0.75. This is in the vigorous activity zone.
  8. 8

    During a bike ride, Sam records these heart rates every 5 minutes: 105, 128, 142, 146, 138, and 120 beats per minute. What is the range of the heart rate data?

    The range is 41 beats per minute because the highest value is 146 and the lowest value is 105, so 146 - 105 = 41.
  9. 9

    A student wants to stay in a moderate zone of 120 to 150 beats per minute. Their heart rate readings are 116, 124, 139, 151, and 147 beats per minute. Which readings are in the moderate zone?

    Include numbers that are at least 120 and no more than 150.

    The readings in the moderate zone are 124, 139, and 147 beats per minute because they are between 120 and 150 beats per minute.
  10. 10

    A class compares average resting heart rates before and after four weeks of regular activity. The average resting heart rate was 78 beats per minute before and 74 beats per minute after. What changed, and by how much?

    The average resting heart rate decreased by 4 beats per minute because 78 - 74 = 4.
  11. 11

    Explain why a person's heart rate usually increases during exercise.

    Think about what muscles need when they work harder.

    A person's heart rate usually increases during exercise because working muscles need more oxygen and energy, so the heart pumps blood faster to deliver oxygen and nutrients.
  12. 12

    Nico's heart rate is 176 beats per minute during a sprint. His estimated maximum heart rate is 208 beats per minute. What percent of his maximum heart rate is he using? Round to the nearest whole percent.

    Nico is using about 85% of his maximum heart rate because 176 divided by 208 is about 0.846, which rounds to 85%.
  13. 13

    A cool-down walk helps heart rate return toward resting level. Kai's heart rate after exercise is 160 beats per minute. After 2 minutes of walking, it is 128 beats per minute. After 4 minutes, it is 104 beats per minute. Describe the trend in Kai's heart rate.

    Look at whether the numbers go up, go down, or stay the same.

    Kai's heart rate is decreasing over time. It drops from 160 to 128 and then to 104 beats per minute as Kai cools down.
  14. 14

    A student's resting heart rate is 72 beats per minute. After jumping rope, the student's heart rate is 156 beats per minute. How many beats per minute above resting is the exercise heart rate?

    The exercise heart rate is 84 beats per minute above resting because 156 - 72 = 84.
  15. 15

    Write one safe choice a student should make if their heart rate feels too high, they feel dizzy, or they have chest pain during exercise.

    Safety comes before finishing a workout.

    A safe choice is to stop exercising, tell an adult, and rest. If symptoms are serious or do not improve, the student should get medical help.
LivePhysics™.com Health - Grade 6-8 - Answer Key