Analysis on the Change of Hand Grip Strength as per the Circumference of Upper Arm and Forearm and the Muscle Activity of Upper Arm and Forearm as per the Duration of Gripping

Abstract

Recently, people ’s interest in health are beingincreased and it is easily found in a fitness centerthat women show keen interest in muscle develop -ment and muscular strength as well as men. When it comes to the symbol of exerciser, you cant’beat the abdominal muscles, pectoralis muscle, firmarm muscle and broad shoulders. Everyone may havehis own reason for exercising. However, most ofexercisers try to make their arm muscle so firm as tobe exposed even with the clothes on it. And peopleestimate the arm strength generally with the girthof arm, that is, the extent of muscle thickness ofarm. The grip strength is the grasping power of handsand normally indicates the muscular strength ofmuscles of arm. The hand is a part of human bodythat is used frequently in activities of daily living andcarries out complex functions. The hand movementsare assorted into 3 big categories of clenching, pick -ing up and grasping. Making all these movementsrequires various kinds of element, among which thegrip strength comes under the most important ele -ment(1). The item of grip strength is indispensable to evalu -ate the hand function in the fields of orthopedics,rehabilitation medicine and industrial medicine. Notonly the muscles of hand are related to the gripstrength but also such muscles as flexor carpi radi-alis, flexor carpi ulnaris, flexor digitorum superfi-cialis, flexor pollicis longus, flexor hallucis brevis,flexor digiti minimi brevis, lumbricale andinterosseous muscle are related and the grip strengthappears as the result of cooperation among all theserelated muscles. Generally the grip strength isrecalled when people talk about the strength ofarm(2). The grip strength both of male and female starts togrow from the age of 10s and it reaches the top levelat the age of 30s to dwindle afterwards. The highestgrip strength of female in their 30s is weaker by43.31%, compared to that of male in their 30s andfemales are weaker by 39.67% than males when wecompare them in terms of overall average(3). The grip strength turns out to show the highest