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优秀青少年运动员大运动量负荷后，血清肌红蛋（Ｍｙｏｇｌｏｂｉｎ，Ｍｂ）和磷酸葡萄糖异构酶（ｐｈｏｓｐｈｏｇｌｕｃｏｉｓｏｍｅｒａｓｅ，ＰＧＩ、ＥＣ５、３、１、９）即刻值均显著高于其正常安静值和常态训练值（ｐ＜０．００１）。休息２４小时后血清Ｍｂ恢复到安静值水平，ＰＧＩ下降活性却不显著，仍高于常态训练值和安静值（Ｐ＜０．０５）。以上结果说明２４小时休息足以恢复大运动量负荷所致的肌细胞膜损伤，但因此造成的肌细胞缺氧、酸性代谢产物对肌糖酵解的ＰＧＩ活性的后继影响并未完全消除，故认为可将血清该酶活性的升高作为肌肉疲劳的标志。
The excellent values of Myoglobin (Mb) and phosphoglucoisomerase (PGI, EC5,3,1,9) were significantly higher than those of the normal and normal training values p <0.001). Serum Mb returned to a resting level 24 hours after resting, but the activity of PGI did not decrease significantly, which was still higher than the normal training value and resting value (P <0.05). The above results indicate that resting at 24 hours is sufficient to restore muscle cell membrane damage caused by heavy exercise load. However, the subsequent effects of hypoxia and acidic metabolites on PGI activity of muscle glycolysis are not completely eliminated. Therefore, Elevated serum enzyme activity as a sign of muscle fatigue.