Biology lab What effect does age have on the breathing rate and heart rate during exercise?

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Biology: Design lab write-up

Research question: What effect does age have on the breathing rate and heart rate during exercise?

Introduction: The experiment is based upon the idea that heart and breathing rate changes after exercise to a certain extent in different ages. During exercise an individual needs to obtain sufficient oxygen to meet his/her energy needs. Extra oxygen can be provided by increased breathing and heart rate The experiment is tested on different boys of different ages assumingly with the same built and height. There are many factors that affect heart rate which includes exposure to heat, stress, drugs (some), emotions, infections and fevers, caffeine intake and age. This research examines the effect of exercise on an individual’s heart and breathing rate.

Hypothesis: Boys heart and breathing rate during exercise goes down with age.


Independent variable: Age

Dependent variable: breathing rate and heart rate

Controlled variable: duration of exercise, type of exercise, gender(boys), height and weight

Measured the participants’ heart rate per minute by using two fingers on their wrist or neck. The candidate had to count their breathing rate per minute. Every exhale and inhale was considered one.

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The candidate then took to the stairs where the subject ran at his own pace. Each candidate ran for 1 minute (60 seconds) under a stopwatch or phone.

Once the participant had run 1 minute, the pulse and breathing rate it taken quickly for one minute. Again the candidate measures their own breathing rate as the heart rate is taken for him by the wrist or the neck (depending on where we found a good beat)

The candidate then took the exercise once again later in the day to ensure accuracy/reliability. ( repeat in method)


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