Effect of betaine supplementation on power performance and fatigue
Effect of betaine supplementation on power performance and fatigue
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DOI：
10.1186/1550-2783-6-7
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发表时间：
2009-02-27
影响因子：
5.1
通讯作者：
Faigenbaum, Avery D.
中科院分区：
文献类型：
--
作者：
Hoffman, Jay R.;Ratamess, Nicholas A.;Faigenbaum, Avery D.
背景资料：本研究的目的是探讨15天的甜菜碱补充对肌肉耐力，功率性能和疲劳率在积极college aged men.Methods：24名男性受试者被随机分配到两组之一。第一组（BET; 20.4 +/- 1.3岁;身高：176.8 +/- 6.6 cm;体重：77.8 +/- 13.4 kg）每天服用补充剂，第二组（PL; 21.4 +/- 4.7岁;身高：181.3 +/- 5.9 cm;体重：83.3 +/- 5.2 kg）服用安慰剂。受试者在补充开始前（T1）和补充后7天（T2）和14天（T3）进行测试。每个测试期均在2天内进行。在测试的第一天，受试者进行垂直跳跃力量（VJP）和卧推投掷（BPT）力量测试。此外，受试者在下蹲和卧推练习中都需要以75%的1-RM进行尽可能多的重复。在每次重复时评估峰值和平均功率。在第二天的测试科目进行了两个30秒Wingate无氧功率测试（WAnT），每个测试分开了5分钟的积极rest.Results：没有差异被视为在T2或T3的重复进行到筋疲力尽或在90%的峰值和平均功率组之间的卧推运动的重复次数。在T2时，BET下蹲运动中进行的重复次数显著大于（p < 0.05）PL。在90%或更高的峰值功率下进行的重复次数在T2和T3时BET显著大于PL。结论：两周的甜菜碱补充剂在活跃的大学男性中似乎可以改善蹲下运动的肌肉耐力，并提高重复的质量。
Background: The purpose of this study was to examine the efficacy of 15 days of betaine supplementation on muscle endurance, power performance and rate of fatigue in active college-aged men.Methods: Twenty-four male subjects were randomly assigned to one of two groups. The first group (BET; 20.4 +/- 1.3 years; height: 176.8 +/- 6.6 cm; body mass: 77.8 +/- 13.4 kg) consumed the supplement daily, and the second group (PL; 21.4 +/- 4.7 years; height: 181.3 +/- 5.9 cm; body mass: 83.3 +/- 5.2 kg) consumed a placebo. Subjects were tested prior to the onset of supplementation (T1) and 7 (T2) and 14 days (T3) following supplementation. Each testing period occurred over a 2-day period. During day one of testing subjects performed a vertical jump power (VJP) and a bench press throw (BPT) power test. In addition, subjects were required to perform as many repetitions as possible with 75% of their 1-RM in both the squat and bench press exercises. Both peak and mean power was assessed on each repetition. On day two of testing subjects performed two 30-sec Wingate anaerobic power tests (WAnT), each test separated by a 5-min active rest.Results: No differences were seen at T2 or T3 in the repetitions performed to exhaustion or in the number of repetitions performed at 90% of both peak and mean power between the groups in the bench press exercise. The number of repetitions performed in the squat exercise for BET was significantly greater (p < 0.05) than that seen for PL at T2. The number of repetitions performed at 90% or greater of peak power in the squat exercise was significantly greater for BET at both T2 and T3 than PL. No differences in any power assessment (VJP, BPT, WAnT) was seen between the groupsConclusion: Two-weeks of betaine supplementation in active, college males appeared to improve muscle endurance of the squat exercise, and increase the quality of repetitions performed.