Outlaw Jordan J, Smith-Ryan Abbie E, Buckley Amanda L, Urbina Stacie L, Hayward Sara, Wingfield Hailee L, Campbell Bill, Foster Cliffa, Taylor Lem W, Wilborn Colin D
1Human Performance Laboratory, University of Mary Hardin-Baylor, Belton, Texas; 2Applied Physiology Laboratory, Exercise and Sport Science, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina; 3Departmentof Health and Exercise Studies, North Carolina State University, Raleigh, North Carolina; and 4Exercise and Performance Nutrition Laboratory, University of South Florida, Tampa, Florida.
J Strength Cond Res. 2016 Sep;30(9):2627-37. doi: 10.1519/JSC.0000000000000665.
Outlaw, JJ, Smith-Ryan, AE, Buckley, AL, Urbina, SL, Hayward, S, Wingfield, HL, Campbell, B, Foster, C, Taylor, LW, and Wilborn, CD. Effects of β-alanine on body composition and performance measures in collegiate women. J Strength Cond Res 30(9): 2627-2637, 2016-The purpose of this study was to evaluate the effects of β-alanine (BA) supplementation and resistance training on body composition and performance. In a double-blind placebo-controlled design, 16 untrained collegiate females (mean ± SD: 21.0 ± 2.2 years; 64.8 ± 8.5 kg; 164.5 ± 7.0 cm; 30.1 ± 5.1 percent body fat [%BF]) completed 8 weeks of resistance training while consuming either 3.4 g BA or placebo (PL; 5 g maltodextrin) before training sessions. Training consisted of 4 days per week upper- and lower-body exercises. Lean body mass (LBM), fat mass (FM), and %BF were assessed using dual-energy x-ray absorptiometry. Maximal oxygen consumption (V[Combining Dot Above]O2max), aerobic time to exhaustion, Wingate peak power, bench press and leg press 1RM (BPmax; LPmax), and repetitions at 65% (BPreps; LPreps), vertical jump (VJ), and standing broad jump were assessed using standard National Strength and Conditioning Association guidelines. All measurements were taken at baseline (T1), 4 weeks (T2), and 8 weeks (T3). Repeated-measures analysis of variance and 95% confidence intervals were used to determine significance. Body composition (LBM, FM, and %BF) improved over time (p < 0.01) for both groups. Maximal strength and VJ increased significantly from baseline to T3 (p ≤ 0.05). There was a significant interaction for LPreps (p = 0.040), with only BA group resulting in significantly greater LPreps (p = 0.041) at T2 and T3. Results from this study suggest that 8 weeks, 4 days per week progressive resistance training and BA supplementation may be effective for improving lower-body muscular endurance. β-alanine had no additive effects on body composition or maximal strength in collegiate women.
奥特洛，JJ；史密斯 - 瑞安，AE；巴克利，AL；乌尔维纳，SL；海沃德，S；温菲尔德，HL；坎贝尔，B；福斯特，C；泰勒，LW；威尔伯恩，CD。β - 丙氨酸对大学女生身体成分和运动表现指标的影响。《力量与体能研究杂志》30(9)：2627 - 2637，2016年——本研究的目的是评估补充β - 丙氨酸（BA）和进行抗阻训练对身体成分和运动表现的影响。在一项双盲安慰剂对照设计中，16名未经训练的大学女生（平均±标准差：21.0±2.2岁；64.8±8.5千克；164.5±7.0厘米；体脂率[％BF]为30.1±5.1％）在每次训练前摄入3.4克BA或安慰剂（PL；5克麦芽糊精），同时完成8周的抗阻训练。训练包括每周4天上半身和下半身练习。使用双能X线吸收法评估去脂体重（LBM）、脂肪量（FM）和％BF。使用美国国家体能协会标准指南评估最大摄氧量（V̇O2max）、有氧耐力时间、温盖特峰值功率、卧推和腿举1RM（BPmax；LPmax）以及65％重量时的重复次数（BPreps；LPreps）、垂直跳（VJ）和立定跳远。所有测量均在基线（T1）、4周（T2）和8周（T3）时进行。采用重复测量方差分析和95％置信区间来确定显著性。两组的身体成分（LBM、FM和％BF）均随时间改善（p < 0.01）。从基线到T3，最大力量和VJ显著增加（p≤0.05）。LPreps存在显著交互作用（p = 0.040），仅BA组在T2和T3时LPreps显著更高（p = 0.041）。本研究结果表明，每周4天、为期8周的渐进式抗阻训练和补充BA可能对提高下半身肌肉耐力有效。β - 丙氨酸对大学女生的身体成分或最大力量没有附加作用。
