CAIE IGCSE Biology 9.2.4 Investigating Exercise & Heart Rate
Practise forming hypotheses and describing pulse-rate changes before, during and after controlled physical activity.
- Syllabus
- 2026–2028
- Course
- Biology 0610
Exam points
- write a testable directional hypothesis that physical activity increases heart rate above resting rate
- measure pulse consistently before exercise and at fixed intervals during activity or recovery
- describe the size and pattern of change using graph values rather than only stating that rate increases
9.2.4—Effect of physical activity on question 1
[Maximum number: 2]
A group of students investigated the effect of exercise on their heart rates.
They measured their heart rates:
- before exercise
- immediately after running 1 km
- one minute after running 1 km
Before doing the investigation they wrote a hypothesis.
Write a hypothesis for this investigation.
1 exercise will increase heart rate (from resting rate) ;
2 after exercise heart rate will, remain high / start decreasing ;
OR
3 there is no effect of exercise on heart rate ;
is the null hypothesis ;
A before exercise heart rate will be lower
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