a Dietetics and Nutrition Department, Escola Superior de Tecnologia da Saúde de Lisboa, Av. Dom João II Lote 4.69.01, 1990-096, Lisboa, Portugal.
b Laboratory of Physiology and Biochemistry of Exercise, Faculty of Human Kinetics, Universidade de Lisboa, Estrada da Costa, 1499-002, Cruz Quebrada, Dafundo, Portugal.
Appl Physiol Nutr Metab. 2019 Jan;44(1):7-12. doi: 10.1139/apnm-2018-0143. Epub 2018 Jun 15.
The purpose of this study was to evaluate the association between whey protein supplementation, body composition, and muscle strength in resistance-trained individuals. Forty-nine healthy males, aged 18 to 35 years and were engaged in resistance training for at least 1 year, were assigned into 2 groups according to whey protein intake (whey - n = 26, age: 30.7 ± 7.4 years, body mass: 75.8 ± 9.0 kg; without whey: n = 23, age: 31.0 ± 7.4 years, body mass: 77.9 ± 9.3 kg). Using a cross-sectional design, a morning assessment of body fat mass (FM) (by dual-energy X-ray absorptiometry) and strength (using 1-repetition maximum for bench press and back squat) was performed. Nutritional assessment was performed by 3-day food records. Regarding nutritional habits, differences between total energy intake (kcal) and estimated energy requirements (kcal) were observed. Results, from raw data or controlling for energy intake, estimated energy requirements, or achieved percentage of energy requirements, showed that whey protein supplementation was inversely correlated with whole-body FM (R = -0.367 (p = 0.010); R = -0.317 (p = 0.049); R = -0.380 (p = 0.011); R = -0.321 (p = 0.047), respectively), trunk FM (R = -0.396 (p = 0.005), R = -0.367 (p = 0.022), R = -0.423 (p = 0.004), R = -0.369 (p = 0.021), respectively) and android FM (R = -0.381 (p = 0.007), R = -0.332 (p = 0.039), R = -0.383 (p = 0.010), R = -0.336 (p = 0.036), respectively). No correlations were found between muscle strength outcomes and whey protein supplementation. The present data suggest that whey protein ingestion has a positive association with whole-body and regional (trunk and android) FM.
本研究旨在评估乳清蛋白补充、身体成分和肌肉力量之间的关联，研究对象为接受抗阻训练的个体。49 名年龄在 18 至 35 岁之间、接受抗阻训练至少 1 年的健康男性，根据乳清蛋白摄入量分为 2 组（乳清组：n = 26，年龄：30.7 ± 7.4 岁，体重：75.8 ± 9.0 公斤；无乳清组：n = 23，年龄：31.0 ± 7.4 岁，体重：77.9 ± 9.3 公斤）。采用横断面设计，在早晨进行身体脂肪量（FM）（通过双能 X 射线吸收法）和力量（通过卧推和深蹲 1 次重复最大重量）评估。通过 3 天的食物记录进行营养评估。关于营养习惯，观察到总能量摄入（千卡）和估计能量需求（千卡）之间存在差异。结果，无论原始数据还是控制能量摄入、估计能量需求或能量需求百分比，均表明乳清蛋白补充与全身 FM（R = -0.367（p = 0.010）；R = -0.317（p = 0.049）；R = -0.380（p = 0.011）；R = -0.321（p = 0.047））、躯干 FM（R = -0.396（p = 0.005），R = -0.367（p = 0.022），R = -0.423（p = 0.004），R = -0.369（p = 0.021））和腹部 FM（R = -0.381（p = 0.007），R = -0.332（p = 0.039），R = -0.383（p = 0.010），R = -0.336（p = 0.036））呈负相关。肌肉力量结果与乳清蛋白补充无相关性。本数据表明，乳清蛋白摄入与全身和局部（躯干和腹部）FM 呈正相关。
