Isometric exercise is best described as which of the following?

Isometric exercise is best described as which of the following?

• A. Contraction of the muscle without length change
• B. Movement through full ROM
• C. Resistance at a fixed velocity
• D. Dynamic contractions with joint movement

Answer: (A)

Isometric exercise involves generating muscle tension without changing the length of the muscle. In this type of contraction, the muscle tenses against resistance but the joint angle remains the same, so there is no visible movement of the limb. This is why a plank or a wall-sit is described as isometric. The other options describe movements where the muscle length changes or the joint moves, such as moving through a full range of motion (dynamic length changes), or contracting at a constant speed with movement (isokinetic), or general dynamic contractions with joint movement. So the exact description that matches is a muscle contraction with no change in length.

Isometric exercise involves generating muscle tension without changing the length of the muscle. In this type of contraction, the muscle tenses against resistance but the joint angle remains the same, so there is no visible movement of the limb. This is why a plank or a wall-sit is described as isometric. The other options describe movements where the muscle length changes or the joint moves, such as moving through a full range of motion (dynamic length changes), or contracting at a constant speed with movement (isokinetic), or general dynamic contractions with joint movement. So the exact description that matches is a muscle contraction with no change in length.