UPDATE: Upon receiving various forms of feedback on this video, I have put together a few consideration that I would like to add to the ideas posted in this video. Some of them are briefly annotated throughout the video, but I will elaborate below. Thank you to all of the people who provide input and discussion. 1. As annotated, I did not initially mean to convey that the Watts of leg power potential should be contrasted directly to the Joules of kinetic energy upon impact from the height drop. However, I did consider the time interval of conccentric contraction to be similar between the vertical jump test and the recoil of a shoulder roll. This being said, if Zach needed to recoil 2700J in a powerful and very fast contraction: the contraction type and speed would be similar to that of a vertical jump. For example, lets say that the recoil takes place in 0.5 seconds. Given that the contraction displayed in his vertical jump of 5982 was generated over a similar interval of time (say 0.5 seconds), the work exerted equals 2991J - which is theoretically enough to redirect the anticipated 2700J of downward, kinetic energy. 2. This will not be completely accurate or all inclusive as an estimation because of the fact that isometric tension is generated in the muscle prior to the conccentric recoil. Eccentric muscle contraction is, by rights, capable of a greater force development than is conccentric. This is both good and bad for the argument of this formulation, in my eyes. Good: since the eccentric phase would be theoretically stronger than the conccentric, to measure the conccentric phase would be observing the capacity of the weakest link - which is ultimately a representation of the top potential of any system. 3. To increase accuracy, including bother eccentric and amortization phases in the measurement of leg power could be useful. Perhaps this can be done by testing leg power from a small drop-plyometric, rather than from a isometric squat. https://youtube/watch?v=JXJM1Fkwpr8
Posted on: Wed, 14 Jan 2015 00:39:15 +0000
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