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Alan's Case Study Answers

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Errors: The time of rest varied between trials due to technical difficulties that resulted in more rest as the problem was being resolved. Also, after tests with higher step rates, it took longer for the participant’s heart rate and breathing rate to return to the baseline level. This represents a random error since each test had slightly more or less rest, and thus might have had slightly better or worse efficiency. Additionally, one of the participants (Alan) had exercised earlier in the day, possibly reducing muscle efficiency. This represents a systematic error since all of the trials done with Alan might have lower efficiency than expected. There was also one trial (70 bpm for participant 2, Matt) where the nose plug fell off in the

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