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Word Count: 625
Hand-Grip dynamometer are used to measure the strength and endurance of the muscles in your forearm and to a lesser extent your hand Using a handgrip dynamometer will increase your performance at work improve posture decrease chances for injury and prevent low back pain Endurance is the ability of a muscle to work for long periods of time without extreme fatigue It prevents unwanted fatigue from daily activities sport and recreation For the elderly person good hand grip strength may prevent a fall down stairs or in bathtubs and may help people from dropping jars It could help the elderly with opening jars as wellThree areas of rationale are used to measure strength-anatomical physiological and biochemical These are all interrelated The first area Anatomical Rationale-Hand grip strength is mainly a function of the muscles in the forearm and hand Eight muscles serve as the prime movers and stabilizers in hand grip strength Eleven other muscles assist in contraction of the handThe second is physiological Rationale which has six categories Six of the most common measurement terms in physiology are mass force work velocity power and energyThe third area is biochemical rationale exercise may be divided into three categories based upon the predominant metabolic pathway The primary biochemical reaction for strength or any muscle contraction is ATP Adenosine TriphosophateThe muscular strength is highly affected by the nervous system Emotional and mental factors play important part in strength testing If a subject is consistent with motivation strength variability should be minimized In women a daily variation in strength range is between 2 and 12 and 5 to 9 in menInstruments used to measure muscle strength are cable tensiometer dymameter free weights barbells isokinetics devices and load cells or elechromechanical devices Strength is usually measured in units of force or torque Kilogram kg and pounds lb is the force unit The torque unit may be expressed as a foot-pounds fl-lb or Newton meters nmThe procedures for handgrip
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