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首页> 外文期刊>American Journal of Physiology >Utilization of skeletal muscle triacylglycerol during postexercise recovery in humans.
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Utilization of skeletal muscle triacylglycerol during postexercise recovery in humans.

机译：人体运动后恢复过程中骨骼肌三酰基甘油的利用。

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摘要

The utilization of muscle triacylglycerols was studied during and after prolonged bicycle ergometer exercise to exhaustion in eight healthy young men. Two days before exercise and in the postexercise recovery period, subjects were fed a carbohydrate-rich diet (65-70% of energy from carbohydrates). Exercise decreased muscle glycogen concentrations from 533 +/- 18 to 108 +/- 10 mmol/kg dry wt, whereas muscle triacylglycerol concentrations were unaffected (49 +/- 5 before vs. 49 +/- 8 mmol/kg dry wt after exercise). During the first 18 h after exercise, muscle glycogen concentrations were restored to 409 +/- 20 mmol/kg dry wt. In contrast, muscle triacylglycerol concentrations decreased (P < 0.05) to a nadir of 38 +/- 5 mmol/kg dry wt, and muscle lipoprotein lipase activity increased by 72% compared with values before exercise. Pulmonary respiratory exchange ratio values of 0.80-0.82 indicated a relatively high fractional lipid combustion despite the high carbohydrate intake. From 18 to 42 h of recovery, muscle glycogen synthesis was slow and muscle triacylglycerol concentrations and lipoprotein lipase activity were restored to the preexercise values. It is concluded that muscle triacylglycerol concentrations are not diminished during exhaustive glycogen-depleting exercise. However, in the postexercise recovery period, muscle glycogen resynthesis has high metabolic priority, resulting in postexercise lipid combustion despite a high carbohydrate intake. It is suggested that muscle triacylglycerols, and probably very low density lipoprotein triacylglycerols, are important in providing fuel for muscle metabolism in the postexercise recovery period.
机译：在八名健康的年轻人中，在长时间的自行车测功器运动至精疲力尽期间和之后研究了肌肉三酰甘油的利用。运动前两天，在运动后恢复期，受试者接受了富含碳水化合物的饮食（65-70％的能量来自碳水化合物）。运动将肌肉糖原浓度从533 +/- 18降低至108 +/- 10 mmol / kg干重，而肌肉三酰甘油浓度未受影响（运动前49 +/- 5 vs运动后49 +/- 8 mmol / kg干重）。运动后的头18小时内，肌肉糖原浓度恢复到409 +/- 20 mmol / kg干重。相比之下，肌肉三酰甘油浓度降低（P <0.05）至最低干重为38 +/- 5 mmol / kg，肌肉脂蛋白脂肪酶活性与运动前相比增加了72％。尽管摄入大量碳水化合物，但肺呼吸交换比值为0.80-0.82表示脂质燃烧的分数相对较高。从恢复的18到42 h，肌肉糖原合成缓慢，肌肉三酰甘油浓度和脂蛋白脂肪酶活性恢复到锻炼前的值。结论是，在消耗力竭的糖原消耗运动期间，肌肉三酰甘油的浓度并未降低。然而，在运动后恢复期中，肌肉糖原的再合成具有较高的代谢优先级，尽管摄取大量碳水化合物，但仍导致运动后脂质燃烧。建议在锻炼后恢复期，肌肉三酰基甘油以及可能非常低密度的脂蛋白三酰基甘油在为肌肉代谢提供燃料方面很重要。

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