Faculty of Sport and Health Science, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga 525-8577, Japan.
Nutrients. 2019 Mar 13;11(3):612. doi: 10.3390/nu11030612.
Protein intake of >0.24 g/kg of body weight (BW) at a single meal is necessary to maximize muscle protein synthesis in a young population. However, the association between the protein intake rate for three meals and muscle mass in the young population has not been evaluated. We hypothesized that a protein intake of >0.24 g/kg BW at all three meals is effective for maintaining muscle mass. Therefore, we cross-sectionally examined the association between protein intake at all three meals with muscle mass in 266 healthy young subjects (aged 21.4 ± 2.4 years). Subjects were divided into the AP group, which achieved protein intake >0.24 g/kg BW at all three meals; and the NP group, which did not. We calculated total fat-free mass (FFM) and appendicular fat-free mass (AppFFM) with dual-energy X-ray absorptiometry, and the percentage of total FFM (TotalFFM%) and appendicular FFM (AppFFM%) were calculated as the percentage of BW (%BW). We demonstrated that TotalFFM% (77.0 ± 0.5 vs. 75.2 ± 0.4%, = 0.008) and AppFFM% (34.7 ± 0.3 vs. 34.1 ± 0.2%, = 0.058) were higher in the AP than in the NP group. This finding suggests that achieving protein intake of >0.24 g/kg BW at all three meals is important for muscle mass maintenance in young populations.
在年轻人中，每餐摄入>0.24 克/公斤体重的蛋白质是最大限度促进肌肉蛋白质合成所必需的。然而，三餐的蛋白质摄入量与年轻人肌肉量之间的关系尚未得到评估。我们假设三餐的蛋白质摄入量>0.24 克/公斤 BW 对维持肌肉量是有效的。因此，我们在 266 名健康年轻受试者（年龄 21.4 ± 2.4 岁）中进行了横断面研究，调查了三餐蛋白质摄入量与肌肉量之间的关系。受试者分为 AP 组，即三餐均达到>0.24 克/公斤 BW 的蛋白质摄入量；NP 组，即没有达到。我们使用双能 X 射线吸收法计算总去脂体重（FFM）和四肢去脂体重（AppFFM），并计算总 FFM（TotalFFM%）和四肢 FFM（AppFFM%）的百分比，作为体重的百分比（%BW）。我们表明，AP 组的 TotalFFM%（77.0 ± 0.5 比 75.2 ± 0.4%， = 0.008）和 AppFFM%（34.7 ± 0.3 比 34.1 ± 0.2%， = 0.058）均高于 NP 组。这一发现表明，在年轻人中，每餐摄入>0.24 克/公斤 BW 的蛋白质对于维持肌肉量是很重要的。
