What is a static or held muscle position where tension is developed but length and joint angle do not change?

The correct choice refers to isometric contraction, which is characterized by the development of tension in a muscle without any change in its length or the angle of the joint it crosses. This type of contraction occurs when the muscle exerts force against a resistance that does not allow for movement; for instance, holding a weight in a fixed position. During an isometric contraction, while the muscle is engaged and tension is produced, there is no overall shortening or lengthening of the muscle fibers, and thus, the joint angle remains static.

Dynamic contractions involve movement and change in muscle length, while both eccentric and concentric contractions describe situations where the muscle changes length while generating force—eccentric contractions lengthen the muscle as it resists force, and concentric contractions shorten the muscle as it works to produce movement. In contrast, isometric contractions are essential for stability and maintaining posture, playing a crucial role in various physical activities and rehabilitation efforts.