PDF(Pubmed)
Abstract：
OBJECTIVE: Citrulline (CIT) and beetroot extract (BR) have separately shown benefits in rowing performance-related outcomes. However, effects of combined supplementation remain to be elucidated. The main purpose of this research was to study the effects of 1 week of daily co-supplementation of 3.5 g BR (500 mg NO3-) plus 6 g CIT on aerobic performance, maximal strength, and high-intensity power and peak stroke in elite male rowers compared to a placebo and to a BR supplementation.
METHODS: 20 elite rowers participated in this randomized, double-blind, placebo-controlled crossover trial completing 1 week of supplementation in each group of study: Placebo group (PLAG); BR group (BRG); and BR + CIT group (BR-CITG). 3 main physical tests were performed: aerobic performance, Wingate test and CMJ jump, and metabolic biomarkers and physiological outcomes were collected.
RESULTS: The Wingate all-out test showed no between-condition differences in peak power, mean power, relative power, or fatigue index (P > 0.05), but clearance of lactate was better in BR-CITG (P < 0.05). In the performance test, peak power differed only between PLAG and BR-CITG (P = 0.036), while VO2peak and maximum heart rate remained similar. CMJ jumping test results showed no between-condition differences, and blood samples were consistent (P > 0.200).
CONCLUSIONS: Supplementation with 3.5 g of BR extract plus 6 g of CIT for 7 days improved lactate clearance after Wingate test and peak power in a performance test. No further improvements were found, suggesting longer period of supplementation might be needed to show greater benefits.
METHODS: 20 elite rowers participated in this randomized, double-blind, placebo-controlled crossover trial completing 1 week of supplementation in each group of study: Placebo group (PLAG); BR group (BRG); and BR + CIT group (BR-CITG). 3 main physical tests were performed: aerobic performance, Wingate test and CMJ jump, and metabolic biomarkers and physiological outcomes were collected.
RESULTS: The Wingate all-out test showed no between-condition differences in peak power, mean power, relative power, or fatigue index (P > 0.05), but clearance of lactate was better in BR-CITG (P < 0.05). In the performance test, peak power differed only between PLAG and BR-CITG (P = 0.036), while VO2peak and maximum heart rate remained similar. CMJ jumping test results showed no between-condition differences, and blood samples were consistent (P > 0.200).
CONCLUSIONS: Supplementation with 3.5 g of BR extract plus 6 g of CIT for 7 days improved lactate clearance after Wingate test and peak power in a performance test. No further improvements were found, suggesting longer period of supplementation might be needed to show greater benefits.
摘要：
目的：瓜氨酸（CIT）和甜菜根提取物（BR）在赛艇表现相关结果中分别显示出益处。然而,联合补充的效果仍有待阐明。这项研究的主要目的是研究每日共补充1周3.5gBR（500mgNO3-）加6gCIT对有氧性能的影响，最大强度,与安慰剂和补充BR相比，精英男性赛艇运动员的高强度力量和峰值中风。
方法：20名精英赛艇运动员参与了这项随机研究，双盲,在每组研究中完成1周补充的安慰剂对照交叉试验:安慰剂组(PLAG);BR组(BRG);和BR+CIT组(BR-CITG)。进行了3项主要物理测试：有氧性能，翼门测试和CMJ跳跃，并收集代谢生物标志物和生理结果。
结果：Wingate全力以赴测试显示峰值功率没有条件之间的差异，平均力量，相对功率,或疲劳指数（P>0.05），BR-CITG中乳酸清除率较好（P<0.05）。在性能测试中，峰值功率仅在PLAG和BR-CITG之间有所不同(P=0.036)，而VO2峰值和最大心率保持相似。CMJ跳跃测试结果显示条件之间没有差异，和血液样本一致（P>0.200）。
结论：补充3.5gBR提取物加6gCIT7天后可改善Wingate试验后的乳酸清除率和性能试验中的峰值功率。没有发现进一步的改进，提示可能需要更长的补充时间才能显示出更大的益处。
方法：20名精英赛艇运动员参与了这项随机研究，双盲,在每组研究中完成1周补充的安慰剂对照交叉试验:安慰剂组(PLAG);BR组(BRG);和BR+CIT组(BR-CITG)。进行了3项主要物理测试：有氧性能，翼门测试和CMJ跳跃，并收集代谢生物标志物和生理结果。
结果：Wingate全力以赴测试显示峰值功率没有条件之间的差异，平均力量，相对功率,或疲劳指数（P>0.05），BR-CITG中乳酸清除率较好（P<0.05）。在性能测试中，峰值功率仅在PLAG和BR-CITG之间有所不同(P=0.036)，而VO2峰值和最大心率保持相似。CMJ跳跃测试结果显示条件之间没有差异，和血液样本一致（P>0.200）。
结论：补充3.5gBR提取物加6gCIT7天后可改善Wingate试验后的乳酸清除率和性能试验中的峰值功率。没有发现进一步的改进，提示可能需要更长的补充时间才能显示出更大的益处。
