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首页> 外文期刊>Journal of Nutritional Science and Vitaminology >Relationship between Dietary Protein or Essential Amino Acid Intake and Training-Induced Muscle Hypertrophy among Older Individuals
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Relationship between Dietary Protein or Essential Amino Acid Intake and Training-Induced Muscle Hypertrophy among Older Individuals

机译：老年人膳食蛋白或必需氨基酸摄入和训练诱导的肌肉肥大的关系

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摘要

Dietary protein intake is critical for maintaining an optimal muscle mass, especially among older individuals. Although protein supplementation during resistance training (RT) has been shown to further augment training-induced muscle mass in older individuals, the impact of daily variations in protein intake on training-induced muscle mass has not been explored thus far. Therefore, this study aimed to investigate the relationship between the dietary protein and amino acid intake and RT-induced muscle hypertrophy among older individuals. Ten healthy older men (n=10; mean age=69 +/- 2 y; body weight (BW)=61.5 +/- 2.2 kg; height=1.65 +/- 0.02 m) participated in progressive RT performed 3 times/wk for 12 wk. Body composition (using DXA) and nutritional assessments (using a 3-d dietary record) were performed before and after the training period. Leg lean mass (LLM) increased significantly (15.0 +/- 0.8 vs. 15.4 +/- 0.8 kg, p0.05) after RT, with no change in dietary nutrient intake. The average dietary protein intake was 1.62 +/- 0.11 g/kg BW/d, while essential amino acids was 600 +/- 51 mg/kg BW/d. Although the correlation between the increase in LLM and dietary protein intake was not significant, a significant correlation was found between the increase in LLM and dietary essential amino acid (EAA) intake. Furthermore, there were significant correlations between the increase in LLM and protein as well as EAA (especially leucine) intake at breakfast among subjects with suboptimal protein intake (p0.05). Our study findings indicate that dietary protein as well as EAA intake may be significant contributing factors in muscle hypertrophic response during RT among healthy older men.
机译：膳食蛋白摄入是维持最佳肌肉质量的关键，特别是在老年人中。虽然在抗性训练（RT）期间蛋白质补充已经显示出进一步增强培训诱导的老年人肌肉肿块，但到目前为止还没有探讨蛋白质摄入量对训练诱导的肌肉肿块的影响。因此，本研究旨在调查老年人膳食蛋白和氨基酸摄入与RT诱导的肌肉肥厚之间的关系。十个健康的老年人（n = 10;平均年龄= 69 +/- 2 y;体重（bw）= 61.5 +/- 2.2 kg;高度= 1.65 +/- 0.02 m）参加逐步RT进行3次/周12周。在训练期之前和之后进行身体成分（使用DXA）和营养评估（使用3-D饮食记录）。腿部稀质质量（LLM）在室温下显着增加（15.0 +/- 0.8 kg，p＆ 0.05），膳食营养摄入量没有变化。平均膳食蛋白摄入量为1.62 +/- 0.11g / kg bw / d，而主要氨基酸为600 +/- 51mg / kg bw / d。虽然LLM和膳食蛋白摄入量的增加不显着，但在LLM和膳食必需氨基酸（EAA）的增加之间发现了显着的相关性。此外，LLM和蛋白质的增加与EAA（特别是亮氨酸）在早餐中摄入次优蛋白摄入的受试者（P <0.05）之间存在显着相关性。我们的研究结果表明，在健康老年人中，膳食蛋白以及EAA摄入可能是肌肉肥厚反应中的显着因素。

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