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我们知道,激烈运动时产生的乳酸大量进入血液,大部分由肝细胞利用重新合成肝糖元,另一部分在血浆中离解放出H~+,后者与血浆中碳酸盐结合形成解离程度较低的碳酸,PH值发生微小变动。当血乳酸值升到一定程度,H~+浓度大量增加,血液中的NaHCO_2/H_2CO_3缓冲系统被破坏,以致pH值明显下降,影响神经肌肉接点的信号传递,组织兴奋性随之降低。PH值的变动亦抑制PFK的活性,使能量产生降低。因此,现在对造成运动员跑速下降原因的流行看法是,随着运动强度和时间的增加,运动员体内参加代谢的基质缺少且平衡紊乱,代谢产物积累,肌肉细胞中pH值下降,通过抑制糖酵解过程,从而可能限制肌肉工作的能力。影响肌球蛋白和肌动蛋白的相互作用,导致疲劳状态出现。根据功与能之间的关系,可以认为运
We know that intense exercise produces large amounts of lactic acid into the blood, most of the use of liver cells by the re-synthesis of hepatic glycogen, the other part of the plasma dissociates H ~ +, which in combination with the formation of plasma carbonate dissociation degree Lower carbonic acid, PH value changes slightly. When the blood lactic acid value rises to a certain extent, the concentration of H ~ + increases greatly, and the NaHCO 2 / H 2 CO 3 buffer system in the blood is damaged, resulting in a significant decrease of pH, affecting the signal transmission of neuromuscular junctions and decreasing the excitability of tissues. Changes in pH also inhibit the activity of PFK, resulting in reduced energy production. Therefore, the prevailing view that causes the decline of run-speed of athletes now is that with the increase of exercise intensity and time, the body of athletes participating in metabolism lack and disorder of balance, the accumulation of metabolites, the decrease of pH in muscle cells, Solve the process, which may limit the ability of muscle work. Affect the interaction between myosin and actin, resulting in the appearance of fatigue. According to the relationship between work and energy, can be considered luck