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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. Method: 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. ...read more.


Candidate Experiment no. Initial Heart rate Heart rate After 1 minute of exercise Increase in heart rate per minute Mean increase in heart rate per minute. Boy 1 (11 years) 1 2 74 81 134 153 60 72 66 Boy 2 (12 years) 1 2 61 69 112 122 51 53 52 Boy 3 (13 years) 1 2 73 74 114 120 41 46 43.5 Boy 4 (14 years) 1 2 64 71 92 98 28 27 27.5 Boy 5 (15 years) 1 2 76 83 132 136 56 53 54.5 Boy 6 (16 years) 1 2 81 85 144 147 63 62 62.5 Discussion of results: The results show that the heart rate during exercise decreases with age from 11years- 14 years whereas the heart rate of the 15 and 16 year old increases. Heart rates achieved during exercise are expected to decrease with age. These results are therefore consistent with what was expected between 11 and 14 years however, the heart rates of the 15 and 16 year old do not agree with what was expected. ...read more.


Also there were several incidents were the candidates would lie about the number counted for the breathing rather because they were unsure how to. To trust the candidates to count how many breaths in a minute seemed to be a difficult issue whereby the candidate would force to exhale and inhale air instinctively for concentrating on their breathing, therefore giving incorrect data. Candidates also ran at their own pace therefore some candidates did more work than others. At some stage the stairs were wet and the assumption is that some of the candidates ran slower to prevent an accident. An attempt to find candidates that had the sane build and size seemed to be difficult as an 11 year old would not have the same build or size as a 16 year old. Improvements: The experimenters should take both the heart rate and breathing rate to minimise on errors caused by participants. Height and weight could be measured so that candidates are of equal height and weight. Using the same stopwatch to avoid errors of difference in the phone and stopwatch. ...read more.

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