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我国部分青少年体型细长、肌肉无力、胸围窄小,被称为“豆芽菜”体型。要改变“豆芽菜”体型,必须参加体育锻炼,使肌肉发达有力、胸围扩大、体重增加。体育锻炼可使肌肉纤维增粗、肌肉血管供血增加,促进新陈代谢,使新生细胞增生加快。经常锻炼的青少年的胸围可以比同龄人大2～3厘米以上,肺活量多200毫升以上。另外,经常锻炼的人的肌肉相当于体重总量的50°,不锻炼的人仅占体重的35—10°。长期锻炼使肌肉中的毛细血管腔加大和数量增多,肌肉纤维不断变粗,身体显得丰满而结实。
Some of our young slender body, muscle weakness, chest narrow, known as “bean sprouts” body. To change the “bean sprouts” size, you must participate in physical activity, muscle strong, enlarged chest, weight gain. Physical exercise can make muscle fiber thickening, increased blood supply to the muscle blood vessels, promote metabolism, accelerate the proliferation of newborn cells. Regular exercise of young people bust can be larger than their peers 2 to 3 cm above the lung capacity more than 200 ml. In addition, the muscles of people who exercise regularly are equivalent to 50 ° of the total body weight, and those who do not exercise only 35-10 ° of the body weight. Long-term exercise so that the capillary cavity in the muscle to increase and increase the number of muscle fibers continue to thicken, the body appears plump and strong.