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 maintaining the body's center of mass over its base of support. Stability is the body's ability to resist being moved out of balance or to remain steady when disturbed.

If muscles become excessively bulky or tight, they can physically limit movement or may not lengthen enough to let the joint move through its full range. This can restrict the joint's range of motion.

Synovial joints have a fluid-filled cavity that lubricates the joint and allows the bones to move freely. Fixed joints are tightly joined, and cartilaginous joints are connected by cartilage, so both allow much less movement.

Men typically have a higher center of gravity because their body mass is often distributed higher, which can make them less stable. A lower center of gravity generally makes it easier to maintain balance.

A joint's possible range of motion is the maximum movement its structure can allow. Its actual range of motion is the movement a person can achieve or uses in practice, which may be limited by flexibility, muscle tightness, pain, or injury.