What is the term for the action when one or more muscles assist the prime mover?

The term for the action when one or more muscles assist the prime mover is synergy. In this context, the prime mover, also known as the agonist, is the muscle primarily responsible for producing a specific movement. Synergistic muscles work alongside the prime mover to enhance and support its action, helping to create smooth and coordinated movements.

For example, during a bicep curl, the biceps brachii is the prime mover responsible for elbow flexion, while several synergistic muscles, such as brachialis and brachioradialis, work in collaboration to assist with the motion. This cooperative function is essential in many physical activities, ensuring that movements are efficient and stable while reducing the risk of injury.

The concept of synergy is particularly important for understanding muscular interactions during exercise and rehabilitation, as it helps identify how different muscle groups contribute to movement patterns. Recognizing these relationships can be crucial for designing effective training programs or therapeutic interventions.