Your patient attempts to strengthen his triceps by positioning his shoulder at the end of range of shoulder and elbow extension. He reports weakness and inability to extend his shoulder more in this position
His report may best be explained by which of the following?
a. Active insufficiency of the biceps
b. Active insufficiency of the triceps
c. Passive insufficiency of the biceps
d. Passive insufficiency of the triceps
ANS: B
In a position of full shoulder and elbow extension, the triceps would be trying to contract when the
sarcomeres are already maximally shortened and there is maximal overlap between the
myofilaments. This position could also produce passive insufficiency of the biceps, but the
patient's complaint of "weakness" would indicate that the issue is more focused on an inability to
produce more tension rather than lengthen the antagonist muscle.
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