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Matthew Thompson
BME 251 Section 2
Professor Paschal
Homework # 6
10/20/11
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View Full Document 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.
 Spring '11
 mendenhall

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