2.48 describe experiments to investigate the effect of exercise on breathing in humans

Independent variable: time of exercise, or even type of exercise

Dependent variable: breathing rate, breaths per minute

  1. Student A breathes as normally as possible, with an indication of when they breathe in and out
  2. Student B records the breathing rate of student A in breaths per minute before the exercise
  3. Student A runs one lap of a playing field (or another exercise)
  4. Student B records the total number of breaths taken in each minute after the exercise. Steps 2-4 are repeated 3 times for accuracy, though as the student A begins to feel tired, the accuracy may drop as the heart rate would already have been accelerated by the previous exercise. Although you cannot introduce a new student C, validity, you can repeat this experiment the next day when student A is well rested.
  5. Rate of breathing is plotted on a graph, breathing rate on the y axis and the time/type  of exercise on the x axis.
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