Hwang Paul S, Andre Thomas L, McKinley-Barnard Sarah K, Morales Marroquín Flor E, Gann Joshua J, Song Joon J, Willoughby Darryn S
1Department of Health, Human Performance, and Recreation, Exercise and Biochemical Nutrition Laboratory, Baylor University, Waco, Texas;2Department of Health, Kinesiology and Sport, University of South Alabama, Mobile, Alabama; and3Department of Statistical Science, Baylor University, Waco, Texas.
J Strength Cond Res. 2017 Apr;31(4):869-881. doi: 10.1519/JSC.0000000000001807.
Hwang, PS, Andre, TL, McKinley-Barnard, SK, Morales Marroquín, FE, Gann, JJ, Song, JJ, and Willoughby, DS. Resistance training-induced elevations in muscular strength in trained men are maintained after 2 weeks of detraining and not differentially affected by whey protein supplementation. J Strength Cond Res 31(4): 869-881, 2017-Resistance training (RT) with nutritional strategies incorporating whey protein intake postexercise can stimulate muscle protein synthesis and elicit hypertrophy. The early phases of training-induced anabolic responses can be attenuated with longer-term training. It is currently unknown if short-term detraining (DT) can restore these blunted anabolic responses during a subsequent retraining (ReT) period. Twenty resistance-trained men (age 20.95 ± 1.23 years; n = 20) were randomized into one of 2 groups (PRO or CHO; 25 g) in a double-blind manner. Participants followed a 4-day per week RT program (4-week RT; 2-week DT; 4-week ReT) while consuming their respective supplement only on workout days during RT and ReT, but every day during DT. At baseline, 4 weeks after RT (post-RT), 2 weeks after DT (post-2-week DT), and after 4 weeks of ReT after DT (post-ReT), leg press strength (LPS) was assessed and rectus femoris cross-sectional area and lean mass changes were assessed by ultrasonography and dual-energy x-ray absorptiometry, respectively. A factorial 2 × 4 (group by time) analyses of variance with repeated measures were used with a probability level at ≤0.05. LPS was elevated throughout the 10-week training study (p = 0.003) with no decrease in LPS after DT in both groups. Although not statistically significant, both groups retained lean mass after DT. A 2-week period of DT appeared to retain muscular strength in resistance-trained men. Therefore, a short-term period of DT can potentially retain lower-body strength in young resistance-trained men irrespective of supplementing with 25 g of whey protein postexercise.
黄，PS，安德烈，TL，麦金利 - 巴纳德，SK，莫拉莱斯·马罗金，FE，甘恩，JJ，宋，JJ，以及威洛比，DS。训练有素的男性在进行2周停训后，抗阻训练引起的肌肉力量提升得以维持，且不受乳清蛋白补充剂的差异影响。《力量与体能研究杂志》31(4): 869 - 881, 2017 - 结合运动后摄入乳清蛋白的营养策略进行抗阻训练（RT）可以刺激肌肉蛋白质合成并引发肥大。训练诱导的合成代谢反应的早期阶段可能会随着长期训练而减弱。目前尚不清楚短期停训（DT）是否能在随后的再训练（ReT）期间恢复这些减弱的合成代谢反应。20名抗阻训练男性（年龄20.95±1.23岁；n = 20）被双盲随机分为2组之一（PRO或CHO；25克）。参与者遵循每周4天的抗阻训练计划（4周抗阻训练；2周停训；4周再训练），在抗阻训练和再训练期间仅在锻炼日服用各自的补充剂，但在停训期间每天服用。在基线、抗阻训练4周后（抗阻训练后）、停训2周后（停训2周后）以及停训后再训练4周后（再训练后），评估腿举力量（LPS），并分别通过超声和双能X线吸收法评估股直肌横截面积和瘦体重变化。使用重复测量的2×4（组×时间）析因方差分析，概率水平≤0.05。在为期10周的训练研究中，两组的腿举力量均有所提高（p = 0.003），停训后腿举力量均未下降。虽然无统计学意义，但两组在停训后均保留了瘦体重。2周的停训期似乎能使抗阻训练男性保持肌肉力量。因此，短期停训有可能使年轻的抗阻训练男性保持下肢力量，无论运动后是否补充25克乳清蛋白。
