muscle testing, a method of evaluating the contractile unit, including the muscle, tendons, and associated tissues, of a moving part of the body by neurological or resistance testing. The tests may include shortened, middle, and lengthened range-of-motion ability; isokinetic measurement of muscle strength, power, and endurance; and functional tests, such as jogging or specific agility drills, as well as radiography, arthroscopy, electromyography, and other medical tests.