Which term describes the degree to which a joint can be moved by muscle contraction?

The term that describes the degree to which a joint can be moved by muscle contraction is dynamic flexibility. This involves the ability of the muscles to actively contract in order to create movement around a joint. Dynamic flexibility reflects not only the range of motion available at a joint but also the strength and functional capacity of the muscles that support that joint during movement.

In contrast, static flexibility pertains to the range of motion of a joint without any muscle activation or movement, often assessed when a person's body is at rest. Passive flexibility involves the ability to stretch a joint through an external force, such as a partner or gravity, without any muscle contraction. Active flexibility is sometimes seen as a hybrid, as it requires muscle contraction but more focused on the capability to maintain a position rather than dynamic movement. Thus, dynamic flexibility is specifically concerned with the movement aspect facilitated by muscle contraction, making it the most precise term for this concept.