Maintained due to partial contraction of relaxed portions of skeletal muscle. There are ALWAYS a few muscle fibers within a muscle that are contracted while most are relaxed. This is ESSENTIAL in maintaining posture.
Decreased or lost muscle tone. Muscles are "flaccid".
Wasting away of muscles due to disuse or severing the nerve supply.
Increase in the diameter of muscle fibers from forceful repetitive muscular activity such a weightlifting.