Derek is a gymnast, and his favorite event is the rings. to score well, he is required to hold a position for several seconds before continuing into the next move. in his favorite move, he performs shoulder abduction to form a "t" and then holds it without moving. while derek is holding this position, what type of contraction is his deltoid performing?
a. an eccentric contraction
b. a concentric contraction
c. a static contraction
d. a dynamic contraction