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首页> 外文期刊>American Journal of Physiology >Manipulation of dietary carbohydrates after prolonged effort modifies muscle sarcoplasmic reticulum responses in exercising males.
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Manipulation of dietary carbohydrates after prolonged effort modifies muscle sarcoplasmic reticulum responses in exercising males.

机译：长时间努力后，饮食中碳水化合物的处理会改变男性锻炼肌肉的肌浆网反应。

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The hypothesis tested was that disturbances in the sarcoplasmic reticulum (SR) Ca2+-cycling responses to exercise would associate with muscle glycogen reserves. Ten untrained males [peak O2 consumption (VO2 peak) = 3.41 +/- 0.20 (SE) l/min] performed a standardized cycle test (approximately 70% VO2 peak) on two occasions, namely, following 4 days of a high (Hi CHO)- and 4 days of a low (Lo CHO)-carbohydrate diet. Both Hi CHO and Lo CHO were preceded by a session of prolonged exercise designed to deplete muscle glycogen. SR Ca2+ cycling in crude homogenates prepared from vastus lateralis samples indicated higher (P < 0.05) Ca2+ uptake (microM x g protein(-1) x min(-1)) in Hi CHO compared with Lo CHO at 30 min (2.93 +/- 0.10 vs. 2.23 +/- 0.12) and at 67 min (2.77 +/- 0.16 vs. 2.10 +/- 0.12) of exercise, the point of fatigue in Lo CHO. Similar effects (P < 0.05) were noted between conditions for maximal Ca2+-ATPase (microM x g protein(-1) x min(-1)) at 30 min (142 +/- 8.5 vs. 107 +/- 5.0) and at 67 min (130 +/- 4.5 vs. 101 +/- 4.7). Both phase 1 and phase 2 Ca2+ release were 23 and 37% higher (P < 0.05) at 30 min of exercise and 15 and 34% higher (P < 0.05), at 67 min during Hi CHO compared with Lo CHO, respectively. No differences between conditions were observed at rest for any of these SR properties. Total muscle glycogen (mmol glucosyl units/kg dry wt) was higher (P < 0.05) in Hi CHO compared with Lo CHO at rest (+36%), 30 min (+53%), and at 67 min (+44%) of cycling. These results indicate that exercise-induced reductions in SR Ca2+-cycling properties occur earlier in exercise during low glycogen states compared with high glycogen states.
机译：检验的假设是肌质网（SR）的Ca2 +循环运动反应紊乱将与肌肉糖原储备相关。十个未经训练的雄性动物[O2峰值消耗量（VO2峰值）= 3.41 +/- 0.20（SE）l / min]在两次高强度（Hi）后两次进行了标准化循环测试（VO2峰值约70％） （低CHO）和低碳水化合物饮食4天。 Hi CHO和Lo CHO均需进行旨在消耗肌肉糖原的长时间运动。 SR Ca2 +在粗大均质样品中制备的粗匀浆中的循环表明，与30分钟时的Lo CHO相比，Hi CHO中的Ca2 +吸收量更高（P <0.05）microM xg蛋白（-1）x min（-1）（2.93 +/-） 0.10 vs. 2.23 +/- 0.12）和67分钟运动（2.77 +/- 0.16 vs.2。+/- 0.12），Lo CHO的疲劳点。在最大Ca2 + -ATPase（microM xg蛋白（-1）x min（-1））在30分钟时（142 +/- 8.5与107 +/- 5.0）的条件之间也发现了相似的影响（P <0.05） 67分钟（130 +/- 4.5与101 +/- 4.7）。与Lo CHO相比，Hi CHO期间在运动30分钟时第1期和第2期Ca2 +释放分别增加了23％和37％（P <0.05），在67分钟时分别增加了15％和34％（P <0.05）。对于这些SR特性，在静止状态下均未观察到差异。在静置（+36％），30分钟（+ 53％）和67分钟（+ 44％）的情况下，Hi CHO中的总肌肉糖原（mmol葡萄糖基单位/ kg干重）更高（P <0.05） ）骑自行车。这些结果表明，与高糖原状态相比，低糖原状态下运动引起的SR Ca2 +循环特性降低早于运动。

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