Changes in resistance training performance, rating of perceived exertion, and blood biomarkers after six weeks of supplementation with L-citrulline vs. L-citrulline DL-malate in resistance-trained men: a double-blind placebo-controlled trial.

IF 4.5 2区 医学 Q1 NUTRITION & DIETETICS
Davoud Bayat, Mohammad Azizi, Naser Behpour, Grant M Tinsley
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引用次数: 0

Abstract

Purpose: This study aimed to investigate and compare the effects of chronic supplementation with L-Citrulline (LC) vs. L-Citrulline DL-malate (CM) on resistance training (RT) performance.

Methods: Thirty-three resistance-trained men were randomly assigned to ingest LC (8 g), CM (12 g), or Placebo (PL) daily, along with participation in a 6-week RT protocol. Muscular strength (1-repetition maximum [1RM] for hack squat [HS] and bench press [BP]), muscular endurance (repetitions to failure [RTF] for HS, leg extension [LE], BP, and incline press [IP]), rating of perceived exertion (RPE), and blood biomarkers (lactate, urea, and nitric oxide metabolites [NOX]) were assessed before and after the intervention. This study was registered on irct.ir (IRCTID: IRCT20221128056642N1).

Results: Comparing mean ∆ scores revealed a significant difference between LC and PL (p < 0.001) and between CM and PL (p = 0.026) for total upper body (the sum of BP and IP) RTF, but only a trend for difference between LC and PL (p = 0.070) for total lower body (the sum of HS and LE) RTF. A significant time effect for NOX was detected only for LC (p = 0.014) and CM (p = 0.003). In addition, a significant difference between CM and PL (p = 0.009) and a marginally significant difference between LC and PL (p = 0.057) was detected regarding post-exercise NOX values at post-intervention. There were no other between-group differences for any outcome measure.

Conclusion: Chronic citrulline supplementation seems to enhance upper body muscular endurance and post-exercise NOX response to RT, but there is no apparent difference between LC and CM in these aspects.

在抗阻训练的男性中,补充l -瓜氨酸与l -瓜氨酸dl -苹果酸6周后,抗阻训练表现、感知运动等级和血液生物标志物的变化:一项双盲安慰剂对照试验。
目的:本研究旨在调查和比较长期补充l -瓜氨酸(LC)和l -瓜氨酸dl -苹果酸(CM)对阻力训练(RT)性能的影响。方法:33名接受抗阻训练的男性被随机分配每天摄入LC (8g)、CM (12g)或安慰剂(PL),并参与为期6周的RT方案。在干预前后评估肌肉力量(蹲蹲[HS]和卧推[BP]的1次最大重复[1RM])、肌肉耐力(HS、腿伸[LE]、BP和俯卧[IP]的重复至失败[RTF])、感知用力等级(RPE)和血液生物标志物(乳酸、尿素和一氧化氮代谢物[NOX])。这项研究是直接注册的。IRCTID: IRCT20221128056642N1结果:比较平均∆评分,LC与PL在总上体(BP与IP之和)RTF上有显著差异(p p = 0.026),而LC与PL在总下体(HS与LE之和)RTF上有显著差异(p = 0.070)。只有LC (p = 0.014)和CM (p = 0.003)检测到NOX的显著时间效应。此外,在干预后运动后NOX值方面,CM和PL之间存在显著差异(p = 0.009), LC和PL之间存在微显著差异(p = 0.057)。没有其他任何结果测量的组间差异。结论:慢性补充瓜氨酸似乎可以增强上肢肌肉耐力和运动后对RT的NOX反应,但LC和CM在这些方面没有明显差异。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of the International Society of Sports Nutrition
Journal of the International Society of Sports Nutrition NUTRITION & DIETETICS-SPORT SCIENCES
CiteScore
8.80
自引率
3.90%
发文量
34
审稿时长
6-12 weeks
期刊介绍: Journal of the International Society of Sports Nutrition (JISSN) focuses on the acute and chronic effects of sports nutrition and supplementation strategies on body composition, physical performance and metabolism. JISSN is aimed at researchers and sport enthusiasts focused on delivering knowledge on exercise and nutrition on health, disease, rehabilitation, training, and performance. The journal provides a platform on which readers can determine nutritional strategies that may enhance exercise and/or training adaptations leading to improved health and performance.
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