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Health
Exercise and Your Heart
How Movement Builds Cardiovascular Fitness
Related Worksheets
Movement challenges your heart to deliver more oxygen-rich blood to working muscles. During exercise, your heart beats faster and pumps more blood with each beat, which helps your cells make ATP for movement. Over time, regular aerobic activity makes the cardiovascular system more efficient and resilient. This matters because better cardiovascular fitness supports endurance, healthy blood pressure, and lower risk of heart disease.
Key Facts
- Heart rate is the number of heartbeats per minute, measured in beats per minute or bpm.
- Stroke volume is the amount of blood pumped by one ventricle with each heartbeat.
- Cardiac output = heart rate x stroke volume.
- During exercise, cardiac output increases so more oxygen and nutrients reach active muscles.
- Estimated maximum heart rate = 220 - age.
- Moderate aerobic training often targets about 50% to 70% of maximum heart rate.
Vocabulary
- Cardiovascular fitness
- Cardiovascular fitness is the ability of the heart, lungs, blood, and blood vessels to deliver oxygen efficiently during sustained activity.
- Heart rate
- Heart rate is the number of times the heart beats in one minute.
- Stroke volume
- Stroke volume is the volume of blood pumped out of one ventricle during a single heartbeat.
- Cardiac output
- Cardiac output is the total volume of blood the heart pumps in one minute.
- Aerobic exercise
- Aerobic exercise is rhythmic activity that uses oxygen to help produce energy over an extended time.
Common Mistakes to Avoid
- Confusing heart rate with cardiac output is wrong because heart rate counts beats per minute, while cardiac output measures blood volume pumped per minute.
- Assuming a higher resting heart rate always means better fitness is wrong because trained hearts often pump more blood per beat and may have a lower resting heart rate.
- Skipping warm-ups and starting at maximum effort is a mistake because blood flow, breathing, and muscle temperature need time to rise safely.
- Thinking only intense workouts improve the heart is wrong because consistent moderate aerobic exercise can strongly build cardiovascular fitness over time.
Practice Questions
- 1 A 16-year-old student estimates maximum heart rate using 220 - age. What is the estimated maximum heart rate, and what is 60% of that value?
- 2 During exercise, a person's heart rate is 150 bpm and stroke volume is 100 mL per beat. Calculate cardiac output in mL per minute and L per minute.
- 3 Explain why regular aerobic exercise can lower resting heart rate even though it makes heart rate rise during a workout.