NASM Senior Fitness Specialist (SFS) Practice Test – Exam Prep & Study Guide

Muscle contractions can be categorized based on how the muscle length changes while exerting force. In the scenario described, when a muscle exerts a force that is greater than the resistance placed on it, resulting in muscle shortening, this is identified as a concentric contraction.

During a concentric contraction, the muscle fibers generate enough tension to overcome the load, leading to movement. This happens during activities like lifting weights, where the muscle shortens as it contracts to lift the object.

Isometric contractions occur when the muscle exerts force without changing length, such as holding a weight in a stationary position. Eccentric contractions involve the muscle lengthening while under tension, usually when lowering a weight gradually. Isotonic contractions generally refer to movements that result in muscle length change, which includes both concentric and eccentric actions, but does not specify the shortening aspect.

Therefore, given the context of the question focusing on muscle shortening while exerting greater force than the resistance, the correct identification of this type of contraction is concentric.