A 36-year-old athlete exercised on a stationary bicycle for 8 minutes. A fitness tracker recorded her heart rate every minute. The table below shows the results:
| Time (minutes) | Heart rate (beats per minute) |
|---|---|
| 0 | 65 |
| 1 | 90 |
| 2 | 115 |
| 3 | 135 |
| 4 | 150 |
| 5 | 160 |
| 6 | 165 |
| 7 | 165 |
| 8 | 165 |
The safe maximum heart rate for a person exercising can be calculated using the formula:
safe maximum heart rate=220−age in years \text{safe maximum heart rate} = 220 - \text{age in years} safe maximum heart rate=220−age in yearsCalculate the safe maximum heart rate for this athlete.
Identify the athlete's maximum recorded heart rate during the exercise from the table.
The athlete concluded that she exercised within a safe heart rate limit. Explain whether this conclusion is correct by comparing your answers to parts 1 and 2.
51 exam-style questions on AQA GCSE Biology 4.2 Respiration, covering 4.2.1 Aerobic and anaerobic respiration, 4.2.2 Response to exercise, and 4.2.3 Metabolism. Each one has a worked solution and a mark scheme showing where the marks go.