BME 251 HW 6

BME 251 HW 6 - Matthew Thompson BME 251 Section 2 Professor Paschal Homework 6 Problem 2 a Calculations on preceding pages b Marsh et al Journal of

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Matthew Thompson BME 251 Section 2 Professor Paschal Homework # 6 10/20/11
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Problem 2 a) Calculations on preceding pages b) “Marsh et al, Journal of Applied Physiology 51:160, 1981” data comparison: Our measurements, reflected in the graph above, indicate that the peak torque occurs at a joint angle between 0 o and 5 o of dorsiflexion, which we will approximate as -2.5 o of plantarflexion. This does not agree with the results of Marsh and her colleagues. Their observations were that maximum voluntary torque was developed at 10 o of plantarflexion. c) Calculations on preceding pages d) Our findings show that peak voluntary torque occurs at a joint angle of -2.5 o of plantarflexion, whereas maximum dorsiflexor force occurs at an angle of 5 o of plantarflexion. This makes sense because for muscles undergoing contraction there is an optimal length at which we observe the largest force and a small moment arm. This length corresponds to the situation in which there is maximal overlap between the myosin and actin filaments. The differences between our measurements and those of Marsh and her colleagues may result from the complexity of the experiments. For example, Marsh et al. made measurements at 11 different positions of the ankle corresponding to intervals of 5 o , as opposed to 5 different data points with 10 o intervals, and had 25 different subjects instead of just one.
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This note was uploaded on 02/08/2012 for the course EECE 213 taught by Professor Mendenhall during the Spring '11 term at Vanderbilt.

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BME 251 HW 6 - Matthew Thompson BME 251 Section 2 Professor Paschal Homework 6 Problem 2 a Calculations on preceding pages b Marsh et al Journal of

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