UMass Amherst KIN 430 - Biomechanics Lab H (2 pages)

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Biomechanics Lab H



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Biomechanics Lab H

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Pages:
2
School:
University of Massachusetts Amherst
Course:
Kin 430 - Biomechanics
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Emily Weimer Biomechanics Laboratory H Work and Power Subject Weight 645 N Trial 1 2 36 Trial 2 1 62 Trial 3 1 47 Trial 1 2 3 Avg Time s 2 36 1 62 1 47 1 82 Displacement m 1 8 1 8 1 8 1 8 Force N 645 645 645 645 Work J 1 161 1 161 1 161 1 161 Power W 491 95 716 67 789 80 666 14 Sample calculations Work Force x displacement o 645 1 8 1 161 J Power work time o 1 161 2 36 491 95 Discussion When looking at the table above you ll notice that the mechanical work values do not vary form trial to trial This is due to that fact that work is the product of force and displacement In this lab force is going to be equal to the participants weight and displacement is the total height of the steps climbed which both of these variables remain constant throughout all trials In contrast to this the mechanical power is much more variable This is because power is calculated from dividing work by time or by multiplying force by velocity Because the times vary from trial to trial the power is also going to vary based on those times This test could be used to get a general sense of somebody s maximal anaerobic capacity but there are other tests that could be used to produce much more accurate indicators This particular test is aimed towards individuals who are able to safely and quickly move up and down the stairs and it isn t particularly suited for older individuals as they have a higher risk of falling Although it isn t the most accurate test it is easy to conduct and inexpensive as it doesn t require anything besides a timer For the most part this test was pretty basic to participate in and didn t require too much effort so personally there weren t really limiting factors from a physiological standpoint My first trial was significantly higher than my other two trials which I think can be attributed to human error My lab partner would say go and then I would start so it is possible that she started the timer too early before I started going or that my reaction time was slowed For the second two trials she started the time once I started going up the stairs so the timer was based off of when I actually started rather than when she said go It s also possible that I wasn t going as hard as I could ve in the first trial and started to get the hang of it by the second trial As previously discussed there are different advantages and disadvantages to the different tests of anaerobic performance Due to the differences in testing methods in how power is measured there are also going to be variations in the results sometimes resulting in very different peak power results Some tests will look at an individual s physical attributes such as height weight gender and age as a basis for manipulating the results from the tests Different tests can be aimed towards different populations in our case it is geared toward individuals who can quickly move up the stairs in a safe manner The young female who recorded varied peak power results for vertical jump bike sprint and stair sprint could be due to a couple different factors First it could be based on difficulty In my opinion the stair sprint was a very easy test to complete but other individuals may disagree and be better at the bike sprint or vertical jump This particular young female participant had a vertical jump peak power more than four times as large as her bike sprint peak power It is hard to gather which of these test results should be viewed as the most accurate because they are so varied From this example you can see that the different tests clearly produce variation among results leading to inaccuracies when interpreting the data


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