Exercise-induced muscle damage (EIMD) leads to decrements in muscle performance, increases in intramuscular proteins and delayed-onset of muscle soreness (DOMS). Previous research demonstrated that one litre of milk-based protein-carbohydrate (CHO) consumed immediately following muscle damaging exercise can limit changes in markers of EIMD possibly due to attenuating protein degradation and/or increasing protein synthesis. If the attenuation of EIMD is derived from changes in protein metabolism then it can be hypothesised that consuming a smaller volume of CHO and protein will elicit similar effects. Three independent matched groups of 8 males consumed 500 mL of milk, 1,000 mL of milk or a placebo immediately following muscle damaging exercise. Passive and active DOMS, isokinetic muscle performance, creatine kinase (CK), myoglobin and interleukin-6 were assessed immediately before and 24, 48 and 72 h after EIMD. After 72 h 1,000 mL of milk had a likely benefit for limiting decrements in peak torque compared to the placebo. After 48 h, 1,000 mL of milk had a very likely benefit of limiting increases in CK in comparison to the placebo. There were no differences between consuming 500 or 1,000 mL of milk for changes in peak torque and CK. In conclusion, decrements in isokinetic muscle performance and increases in CK can be limited with the consumption of 500 mL of milk.

译文

运动引起的肌肉损伤(EIMD)导致肌肉性能下降,肌内蛋白增加和肌肉酸痛(DOMS)延迟发作。先前的研究表明,肌肉破坏性运动后立即食用一升基于牛奶的蛋白质碳水化合物(CHO),可以限制EIMD标记的变化,这可能是由于蛋白质降解减弱和/或蛋白质合成增加所致。如果EIMD的衰减是由于蛋白质代谢的变化引起的,则可以假设食用较少量的CHO和蛋白质会引起类似的效果。三个独立的匹配组(每组8位男性)在破坏肌肉的运动后立即饮用500 mL牛奶,1,000 mL牛奶或安慰剂。在EIMD之前和之后24、48和72 h评估被动和主动DOMS,等速运动肌性能,肌酸激酶(CK),肌红蛋白和白介素6。 72小时后,与安慰剂相比,1,000 mL牛奶可能有助于限制峰值扭矩的降低。 48小时后,与安慰剂相比,1,000 mL牛奶非常有可能限制CK的增加。摄入500或1,000 mL牛奶的峰值扭矩和CK变化无差异。总之,可以通过消耗500毫升牛奶来限制等速肌性能的下降和CK的增加。

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