Difficulty: Easy

Average Score: 82%

A researcher measured the heart rates of 20 male athletes and 20 female athletes before and immediately after 30 minutes of continuous strenuous exercise. The strenuous exercise included running for 15 minutes and bicycling for 15 minutes. The researcher recorded the data in the table.

Which hypothesis is suitable for this investigation?

Rationale

Body temperature, breathing rate, and heart rate increase with exercise.

This hypothesis provides a direct correlation between exercise and physiological responses, making it suitable for investigating how these systems react under physical exertion. It effectively addresses the expected changes in these vital signs, which are commonly observed during exercise.

A (Body temperature, breathing rate, and heart rate depend on the health of the subject.) YOUR ANSWER

This choice does not directly relate to exercise since it focuses on the overall health of the individual rather than the specific physiological changes that occur during physical activity. While health can influence these vital signs, it does not capture the immediate response to exercise.

B (Many of the body's systems respond to exercise.) YOUR ANSWER

While this statement is true, it is too vague and does not specify which systems or how they respond. It lacks the precision needed to investigate the specific changes in body temperature, breathing rate, and heart rate that occur during exercise.

D (Subjects at rest have better health than subjects that exercise.) YOUR ANSWER

This hypothesis contradicts the common understanding of health, which typically associates regular exercise with better overall health outcomes. It also fails to address the physiological responses of the body during exercise and is therefore not suitable for this investigation.

Conclusion

The hypothesis that body temperature, breathing rate, and heart rate increase with exercise is the most appropriate for this investigation, as it directly connects physiological responses to physical activity. In contrast, the other choices either lack specificity, focus on health rather than exercise, or present contradictory views, making them unsuitable for exploring the mechanisms at play during exercise.

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