In an individual with paraparesis secondary to an incomplete spinal cord lesion, the increase in Achilles tendon tension during gait coincides with the stretch of the triceps surae during passive dorsiflexion of the foot in the stance phase
The increase in Achilles tendon tension is not correlated with an increase in EMG. What causes the abnormal muscle resistance to stretch?
A. Spasticity
B. Contracture
C. Cocontraction
D. Hyperreflexia
E. Atrophy
ANS: B
Rationale: The abnormal triceps surae resistance to stretch is caused by contracture. The shortened muscle cannot stretch as much as a normal length muscle.
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