Breakfast before resistance exercise lessens urinary markers of muscle protein breakdown in young men: A crossover trial
Breakfast before resistance exercise lessens urinary markers of muscle protein breakdown in young men: A crossover trial
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抗阻运动前的早餐可减少年轻男性肌肉蛋白分解的尿液标记物：一项交叉试验
DOI：
10.1016/j.nut.2020.111088
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发表时间：
2021
期刊：
影响因子：
4.4
通讯作者：
Yukari Kawano
中科院分区：
文献类型：
--
作者：
Jun Yasuda;Tatsunosuke Gomi;Ayaka Kotemori;Yuri Yokoyama;Takahiro Yoshizaki;Azumi Hida;Yuki Tada;Yoichi Katsumata;Yukari Kawano
目的不吃早餐会延长前一天吃完最后一餐后开始的禁食状态，并会对肌肉蛋白质平衡产生负面影响。本交叉试验的目的是观察单次抗阻运动前不吃早餐对肌肉蛋白质分解(MPB)的影响，用尿3-甲基组氨酸/肌酐比值(3-MH/Cr)来评估。方法13名习惯吃早餐的健康青年男性，年龄(21.8±1.1)岁，分为吃早餐(EB)和不吃早餐(SB)两组。参与者在整个5天的实验中都食用了无肉饮食。在第5天，EB组在RE前2.5h(最大重复次数75%)吃早餐(497Kcal)，而SB组在餐后吃同样的早餐。结果在双向方差分析中，血胰岛素、游离脂肪酸水平以及3-MH/Cr比值与EB组有显著交互作用(P<；0.05)。与EB组相比，SB组胰岛素水平显著降低(P<；0.001；D=3.281)，游离脂肪酸水平显著升高(P<；0.001；D=0.1.437)和RE后(P=0.013；D=0.811)，3-MH/Cr比值分别为6(P<；0.001；D=0.0.878)和8h(P<；0.001；D=0.0.634)。在运动场上，早餐摄取在肌肉蛋白质正平衡方面的重要性得到了强调。
ObjectivesSkipping breakfast prolongs the fasting state initiated after the last meal consumed the previous day and can have negative effects on muscle protein balance. The aim of this crossover trial was to examine the effects of skipping breakfast before a single bout of resistance exercise (RE) on muscle protein breakdown (MPB), as assessed using the urinary 3-methylhistidine/creatinine ratio (3-MH/Cr).MethodsThirteen healthy young men, who habitually consumed breakfast (21.8 ± 1.1 y of age), were assigned to eating breakfast (EB) and skipping breakfast (SB) conditions. Participants consumed meat-free diets throughout the 5-d experiment. On day 5, individuals in the EB group consumed breakfast (497 kcal) 2.5 h before RE (75% repetition maximum), whereas those in the SB group consumed the same meal after dinner.ResultsIn the two-way analysis of variance, significant interactions were observed with blood insulin and free fatty acid levels, and the 3-MH/Cr ratio (P< 0.05). We confirmed a significantly greater decrease in the insulin level pre-RE (P <0.001;d= 3.281), and increases in the free fatty acid level pre-RE (P <0.001;d= 1.437) and post-RE (P =0.013;d= 0.811) and the 3-MH/Cr ratio 6 (P <0.001;d= 0.878) and 8 h (P <0.001;d= 0.634) post-RE in the SB condition than in the EB condition.ConclusionEating breakfast before RE can be beneficial for MPB suppression. The importance of breakfast consumption in terms of positive muscle protein balance is emphasized on sports fields.