Stability & Range of Motion Answers

If excess muscle is too bulky it can interfere with the motion of a joint, which means that too much muscle strength can reduce a joint's range of motion and can actually reduce flexibility.

Women generally have a lower center of gravity than men, which contributes to greater stability. Men generally have more muscle mass in their upper arms and bodies, which raises their center of gravity and can make them less stable on their feet.

Balance is the ability to maintain equilibrium by neutralizing the forces that disturb it. Stability, meanwhile, is the ability to maintain balance while participating in actions that are likely to upset balance. Standing on one leg for several minutes demonstrates good balance, while playing in a vigorous soccer game without tripping or falling demonstrates good stability.

Unlike fixed joints or cartilaginous joints, where the bones are connected by either connective tissue or cartilage, the bones in synovial joints are not directly joined by anything, which allows for a much greater range of motion.

Each type of joint has a possible range of motion associated with it. This possible range of motion depends upon the type of joint it is, rather than the characteristics of the individual who possesses this joint. A joint's actual range of motion, however, is dependent upon the fitness levels of the individual. Since the possible range of motion is the theoretical maximal range of motion, the actual range of motion will always be less.

Balance is the ability to keep the body's center of mass over its base of support. Stability is the ability to resist being moved out of equilibrium and to maintain or regain balance when disturbed.

If the muscles around a joint are very tight or bulky, they may not lengthen or move out of the way enough for the joint to move freely. This can limit the joint's range of motion.

Synovial joints have a joint cavity filled with lubricating synovial fluid, which reduces friction and allows the bone surfaces to move freely. Fixed joints are held firmly together, and cartilaginous joints are joined by cartilage, so they allow much less movement.

Men are typically taller and carry more of their mass in the upper body, giving them a higher center of gravity than women on average. A higher center of gravity can make them less stable on their feet.

A joint's possible range of motion is the full movement its structure allows. Its actual range of motion is how far a person can really move it, which may be limited by flexibility, muscle tightness, injury, or pain.