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首页> 外文期刊>American Journal of Physiology >Resistance training reduces the acute exercise-induced increase in muscle protein turnover.
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Resistance training reduces the acute exercise-induced increase in muscle protein turnover.

机译：阻力训练减少了急性运动引起的肌肉蛋白质更新的增加。

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摘要

We examined the effect of resistance training on the response of mixed muscle protein fractional synthesis (FSR) and breakdown rates (FBR) by use of primed constant infusions of [2H5]phenylalanine and [15N]phenylalanine, respectively, to an isolated bout of pleiometric resistance exercise. Trained subjects, who were performing regular resistance exercise (trained, T; n = 6), were compared with sedentary, untrained controls (untrained, UT; n = 6). The exercise test consisted of 10 sets (8 repetitions per set) of single-leg knee flexion (i.e., pleiometric muscle contraction during lowering) at 120% of the subjects' predetermined single-leg 1 repetition maximum. Subjects exercised one leg while their contralateral leg acted as a nonexercised (resting) control. Exercise resulted in an increase, above resting, in mixed muscle FSR in both groups (UT: rest, 0.036 +/- 0.002; exercise, 0.0802 +/- 0.01; T: rest, 0.045 +/- 0.004; exercise, 0.067 +/- 0.01; all values in %/h; P < 0.01). In addition, exercise resulted in an increase in mixed muscle FBR of 37 +/- 5% (rest, 0.076 +/- 0.005; exercise, 0.105 +/- 0.01; all values in %/h; P < 0.01) in the UT group but did not significantly affect FBR in the T group. The resulting muscle net balance (FSR - FBR) was negative throughout the protocol (P < 0.05) but was increased in the exercised leg in both groups (P < 0.05). We conclude that pleiometric muscle contractions induce an increase in mixed muscle protein synthetic rate within 4 h of completion of an exercise bout but that resistance training attenuates this increase. A single bout of pleiometric muscle contractions also increased the FBR of mixed muscle protein in UT but not in T subjects.
机译：我们研究了阻力训练对混合肌蛋白分数合成（FSR）和分解率（FBR）的影响，方法是分别使用引发的恒定输注[2H5]苯丙氨酸和[15N]苯丙氨酸对孤立的测压法抵抗运动。将接受定期抵抗运动（训练后的T; n = 6）的训练对象与久坐，未经训练的对照（未训练的UT; n = 6）进行比较。运动测试由10组（每组8次重复）单腿屈膝（即降低过程中的胸肌收缩）组成，受试者的预定单腿1次重复最大值为120％。受试者锻炼一只腿，而其对侧腿充当非运动（静止）对照。锻炼导致两组患者静息状态下混合肌FSR增加（UT：休息，0.036 +/- 0.002;运动，0.0802 +/- 0.01; T：休息，0.045 +/- 0.004;运动，0.067 + / -0.01;所有值均以％/ h表示; P <0.01）。此外，运动导致UT的混合肌FBR增加37 +/- 5％（休息0.076 +/- 0.005;运动0.105 +/- 0.01;所有值以％/ h表示; P <0.01） T组没有明显影响FBR。整个实验过程中产生的肌肉净平衡（FSR-FBR）为阴性（P <0.05），但两组运动腿的肌肉净平衡均增加（P <0.05）。我们得出的结论是，在进行一次运动后的4小时内，测压肌收缩会引起混合肌蛋白合成速率的增加，但是阻力训练会减弱这种增加。一次单次测压性肌肉收缩也可增加UT中混合肌肉蛋白的FBR，但不适用于T受试者。

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