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在紧张的运动或体力工作时,体内能源物质会大量消耗,物质代谢过程加快,特别是在缺氧条件下运动,肌肉收缩会产生大量的乳酸,并积存在体内。同时,运动时还消耗不少的维生素,当维生素B1缺乏时,肌肉运动中的中间产物丙酮酸含量会增加。如较长时间运动,可因脂肪分解产生酮体以及蛋白质分解产生氨、尿素、尿酸等。这些代谢产物均属酸性,又称“疲劳物质”,它在体内堆积过多就会增加血液的酸性,使血液PH值降低(PH值可由7.45降到7.0),人就会感到肌肉酸痛、麻木、关节僵硬,能力下降,即出现运动性疲劳。
In intense exercise or physical work, the body will consume a lot of energy substances, material metabolism accelerated, especially in hypoxic conditions of exercise, muscle contraction will produce a lot of lactic acid, and accumulated in the body. At the same time, exercise also consumes a lot of vitamins, when the lack of vitamin B1, the muscle activity of pyruvate in the intermediate product will increase. Such as a longer period of exercise, may be due to fat decomposition of ketone bodies and protein decomposition produce ammonia, urea, uric acid and so on. These metabolites are acidic, also known as “fatigued material,” which accumulates too much in the body that increases the acidity of the bloodstream and lowers the pH of the bloodstream (the pH drops from 7.45 to 7.0). People feel muscle soreness and numbness , Joint stiffness, decreased ability to exercise fatigue.