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健美的体型以先天遗传和后天生活条件为基础,但主要是通过长期的全面身体锻炼而逐渐形成和保持的。经常游泳的人,多具有令人羡慕的体型,宽宽的肩膀,结实的胸脯,富于弹性的肌肉,全身匀称又富于曲线美。那么,其中的奥秘何在呢? 游泳时,水的阻力要比空气阻力大800多倍。人们在水中游泳,两臂划水同时两腿打水或蹬水,全身肌肉群都参加了活动。根据流体力学速度与阻力平方成正比的定律,人体在水中运动,速度若增加2倍,阻力就增加4倍;速度若增加了3倍,阻力就增加9倍。因而,游速越快,阻力越大,越能反射性地引起大脑皮层动员更多的肌纤维参加运动,促使全身的肌肉得到良好的锻炼。尤其是与上肢摆动划水有关的胸大肌、三角肌、肱
Bodybuilding body shape based on genetic and acquired conditions, but mainly through long-term comprehensive physical exercise and gradually formed and maintained. Often swimming people, with more enviable size, wide shoulders, strong breasts, flexible muscles, body symmetry and rich in the curve of the United States. So, what’s the secret? Swim, water resistance than air resistance more than 800 times. People swimming in the water, his arms paddling at the same time his legs water or pedal water, the whole body muscle groups have participated in the activities. According to the law of fluid mechanics proportional to the square of the resistance, the human body moves in the water. If the speed increases by 2 times, the resistance increases by 4 times. If the speed increases by 3 times, the resistance increases by 9 times. Thus, the faster swimming speed, the greater the resistance, the more reflex can cause the cerebral cortex to mobilize more muscle fibers to participate in sports, to promote good muscle training. Especially with the upper limb swinging pectoralis major, deltoid, brachial