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What is the difference between a concentric and an eccentric muscle contraction?
In a concentric contraction the muscle is shortening and in an eccentric
contraction the muscle is lengthening.
Is the muscle force for a certain level of activation greater for concentric or eccentric contraction?
For a certain level of activation, a muscle will produce a greater force
during an eccentric contraction than during a concentric contraction.
Calculate the physiological cross-sectional area for the gastrocnemius specimen in the previous worked example for pennation angles of 0° and 30° and comment on how the physiological cross-sectional area is related to pennation angle.
Thus, as the pennation angle increases the physiological cross-sectional area decreases according to the cosine function.
What is electromyography?
Electromyography is the study of the electrical signal associated with the
contractions of muscles.
Is there a relationship between EMG and muscle force?
There is a relationship between EMG and muscle force. However, it is only
possible to characterise this relationship under controlled conditions.
What is the distribution problem?
The distribution problem is the problem of how the total muscle force is
distributed between all the muscles crossing a joint.
Name the three segments of the lower limb.
The three segments of the lower limb are the thigh, leg and foot.
Name the three major joints of the lower limb
The three major joints of the lower limb are the hip, knee and ankle.