How is extension defined in joint movement?

Extension is defined as the movement that increases the angle between two body parts at a joint. During this action, the segments connected by the joint move away from each other, effectively allowing the joint to open wider. For example, when you straighten your arm or leg, the angle at your elbow or knee increases, demonstrating extension in those joints.

This physiological movement is essential in various activities, as it allows for the full range of motion and functionality. Understanding the concept of extension is crucial for clinical exercise physiologists when designing and implementing exercise programs to promote joint health and functionality, especially for clients recovering from injuries or with joint limitations.