Muscle Fatigue

fiona.i.davidson
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Anjana
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fiona.i.davidson
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AQA GCSE Controlled Assessment ISA Biology 2015

Resource summary

Muscle Fatigue
  1. Research
    1. My first source was useful because the instructions and results table were clear and easy to follow
      1. The second source was not useful because there were no variables and not enough instructions
        1. Source 1 was the most useful because it was easier to follow and the instructions were more precise and the results we obtained would be more likely to yield accurate results.
        2. Resolution
          1. The resolution of the equipment was appropriate because the resolution of the stopwatch was 0.005 seconds and the smallest we need is around 10 seconds. The resolution for the metronome is 4 beats per second and the beat we would like it to play at constantly is around 200 beats a minute
          2. Another method we could have used is sandbags and how many sandbags someone could lift in one minute and giving them different recovery times between each test
            1. This method is better if the hypothesis was to do with recovery time but considering the fact we are measuring intensity of exercise, the method is not really very useful
            2. Hypothesis
              1. The more intense the exercise, the faster the muscle gets fatigued
                1. Exercising causes the muscles to contract faster and harder and so the muscles need more oxygen and glucose. But because the rate of energy needed is so high and there's not enough oxygen . This means the body starts anaerobically respiring and producing lactic acid. The build up of which causes the muscle to be fatigued
                2. Variables
                  1. Independent Variable
                    1. Intensity of exercise
                      1. Range: 0-5 loom bands
                        1. Interval: 1 loom band
                      2. I will use a metronome with a resolution of 4 beats a second to ensure that the timing is more accurate instead of rough estimation as to the variation of exercise.
                      3. Dependant Variable
                        1. I will use a stopwatch with a resolution of 0.005 seconds to ensure that the measuring is as accurate as possible and so the results will be more accurate and more precise
                        2. Control Variables
                          1. Same person
                            1. Same peg
                              1. Same elasticity of loom band
                                1. Same beat of the metronome
                                  1. Recovery time
                                2. Preliminary testing: Recovery time
                                  1. 10-50 minutes
                                    1. Having a big variation makes it very clear to see exactly what is too short, and what is too long
                                      1. The final choice was 20 minutes resting time because 10 minutes was too short and anything after 20 minutes made no difference and there was no difference in waiting any period of time after 20 minutes
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