Esen Ozcan, Karayigit Raci
Department of Health Professions, Manchester Metropolitan University, Manchester, UK.
Faculty of Sport Sciences, Ankara University, Ankara, Turkey.
J Diet Suppl. 2023;20(5):777-787. doi: 10.1080/19390211.2022.2119321. Epub 2022 Sep 12.
Research on the effect of L-arginine supplementation on exercise performance is still inconsistent and its influence on single-bout swimming performance has not been investigated. Therefore, the aim of this study was to assess if one-week L-arginine supplementation would enhance 200-m freestyle swimming performance in trained/developmental (regularly training ∼3 times per week with a purpose to compete) male swimmers. In a randomized, cross-over, double-blind design, 8 trained/developmental male swimmers (age 25 ± 5 years; mean ± SD) completed 200-m freestyle swimming time-trial on 3 separate occasions: a control trial; and after 2 separate 7-d supplementation periods, with a daily dose of either 8 g/d of L-arginine or placebo trials. Blood lactate concentration was measured immediately post time-trial swimming. Completion time of the 200-m freestyle swimming time-trial did not differ significantly (F = 4.55; P = 0.060; ŋp2 = 0.394) between control (149.40 ± 9.88 s), L-arginine (146.02 ± 10.34 s) and placebo trials (147.58 ± 10.86 s). There was no statistically significant difference in post time-trial swimming blood lactate concentration between trials (control: 11.2 ± 2.7; L-arginine: 13.1 ± 1.8; Placebo: 12.2 ± 2.7, F = 3.52; P = 0.058; ŋp2 = 0.335). One-week of supplementation with 8 g/d of L-arginine, had no ergogenic effect on middle-distance (200-m), freestyle swimming performance in trained/developmental male swimmers.
补充L-精氨酸对运动表现影响的研究结果仍不一致，且其对单次游泳表现的影响尚未得到研究。因此，本研究的目的是评估为期一周的L-精氨酸补充是否会提高训练有素/处于发育期（每周有目的地进行约3次常规训练）的男性游泳运动员200米自由泳的成绩。在一项随机、交叉、双盲设计中，8名训练有素/处于发育期的男性游泳运动员（年龄25±5岁；均值±标准差）在3个不同场合完成了200米自由泳计时赛：一次对照试验；以及在两个不同的7天补充期后，分别每日服用8克L-精氨酸或进行安慰剂试验。在计时赛游泳结束后立即测量血乳酸浓度。200米自由泳计时赛的完成时间在对照试验（149.40±9.88秒）、L-精氨酸试验（146.02±10.34秒）和安慰剂试验（147.58±10.86秒）之间没有显著差异（F=4.55；P=0.060；ŋp2=0.394）。各试验之间计时赛游泳后血乳酸浓度没有统计学上的显著差异（对照：11.2±2.7；L-精氨酸：13.1±1.8；安慰剂：12.2±2.7，F=3.52；P=0.058；ŋp2=0.335）。对训练有素/处于发育期的男性游泳运动员而言，为期一周每日补充8克L-精氨酸对中距离（200米）自由泳成绩没有促力作用。
