Tension in a relaxed resting muscle due to activity of some of the muscle fibres. Muscle tone is maintained involuntarily without fatigue through the activity of the nervous system, especially the reflex stimulation of the alpha motor neurones by the muscle spindles in the muscle concerned. The natural elasticity or turgor of muscle and connective tissue may also contribute to muscle tone. Muscle tone is particularly evident in muscles that are opposing the effects of gravity and maintaining body posture. The degree of muscle tone can be judged by the ease with which joints can be passively stretched and flexed.
Subjects: Sports and Exercise Medicine.