1Department of Ophthalmology, KU Eye, University of Kansas Medical Center, Prairie Village, Kansas; 2Department of Health, Sport, and Exercise Sciences, Biomechanics Laboratory, University of Kansas, Lawrence, Kansas; 3Department of Kinesiology, Human Performance Laboratory, California State University-San Bernardino, San Bernardino, California; 4Department of Exercise and Sport Science, Neuromuscular Research Laboratory, University of North Carolina-Chapel Hill, Chapel Hill, North Carolina; 5Department of Sport and Exercise Science, University of Central Florida, Orlando, Florida; and 6Department of Nutrition and Health Sciences, University of Nebraska-Lincoln, Lincoln, Nebraska.
J Strength Cond Res. 2013 Nov;27(11):3091-100. doi: 10.1519/JSC.0b013e31828c289f.
The purpose of this study was to examine the effects of 2 different types of protein supplementation on thigh muscle cross-sectional area (CSA), blood markers, muscular strength, endurance, and body composition after 8 weeks of low- or moderate-volume resistance training in healthy, recreationally trained, college-aged men. One hundred and six men were randomized into 5 groups: low-volume resistance training with bioenhanced whey protein (BWPLV; n = 22), moderate-volume resistance training with BWP (BWPMV; n = 20), moderate-volume resistance training with standard whey protein (SWPMV; n = 22), moderate-volume resistance training with a placebo (PLA; n = 21), or moderate-volume resistance training with no supplementation (CON; n = 21). Except for CON, all groups consumed 1 shake before and after each exercise session and one each on the nontraining day. The BWPLV, BWPMV, and SWPMV groups received approximately 20 g of whey protein per shake, whereas the BWP groups received 5 g of additional polyethylene glycosylated (PEG) leucine. Resistance training sessions were performed 3 times per week for 8 weeks. There were no interactions (p > 0.05) for muscle strength and endurance variables, body composition, muscle CSA, and safety blood markers, but the main effects for training were observed (p ≤ 0.05). However, the Albumin:Globulin ratio for SWPMV was lower (p = 0.037) than BWPLV and BWPMV. Relative protein intake (PROREL) indicated a significant interaction (p < 0.001) with no differences across groups at pre; however, BWPLV, BWPMV, and SWPMV had a greater intake than did PLA or CON at post (p < 0.001). This study indicated that 8 weeks of resistance training improved muscle performance and size similarly among groups regardless of supplementation.
本研究旨在探讨两种不同类型的蛋白质补充对健康、有规律运动的大学生男性进行低或中等强度抗阻训练 8 周后大腿肌肉横截面积（CSA）、血液标志物、肌肉力量、耐力和身体成分的影响。106 名男性被随机分为 5 组：低强度抗阻训练+生物增强乳清蛋白（BWPLV；n=22）、中强度抗阻训练+BWP（BWPMV；n=20）、中强度抗阻训练+标准乳清蛋白（SWPMV；n=22）、中强度抗阻训练+安慰剂（PLA；n=21）或中强度抗阻训练+不补充（CON；n=21）。除 CON 组外，所有组均在每次运动前后和非训练日各服用 1 份奶昔。BWPLV、BWPMV 和 SWPMV 组每份奶昔摄入约 20 克乳清蛋白，而 BWP 组摄入 5 克额外的聚乙二醇化（PEG）亮氨酸。抗阻训练每周进行 3 次，共 8 周。肌肉力量和耐力变量、身体成分、肌肉 CSA 和安全性血液标志物均无交互作用（p＞0.05），但观察到训练的主要作用（p≤0.05）。然而，SWPMV 的白蛋白：球蛋白比值较低（p=0.037），低于 BWPLV 和 BWPMV。相对蛋白质摄入量（PROREL）显示出显著的交互作用（p＜0.001），但各组在训练前没有差异；然而，BWPLV、BWPMV 和 SWPMV 的摄入量高于 PLA 或 CON（p＜0.001）。本研究表明，无论补充何种蛋白质，8 周的抗阻训练都能使各组的肌肉性能和大小得到相似的改善。
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