This question is about the difference in recruitment order between voluntary movement and functional electrical stimulation...
This question is about the difference in recruitment order between voluntary movement and functional electrical stimulation (FES).
A. How does the size principle of motor axon recruitment limit functional electrical stimulation of muscles used for walking?
B. In FES, how does this affect fine control and muscle fatigue?
Homework Answers
|
1 |
According to Henneman's size principle, in presence of a load, the recruitment of motor unit is observed from smallest to largest. The slow twitch-low force, fatigue resistant muscle fibers are activated first followed by less fatigue-resistant muscle fibers. |
|
2 |
Muscle atrophy is associated with resistance to a rapid fatigue compromised by upper-motor neuron lesions in the spinal cord. The reduction of muscle fatigue is associated with stimulation at the motor point innervating the target muscle. |
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