期刊
NITRIC OXIDE-BIOLOGY AND CHEMISTRY
卷 59, 期 -, 页码 10-20出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.niox.2016.06.008
关键词
Nitric oxide; L-arginine; Blood pressure; Muscle oxygenation; Metabolism; Fatigue
This study tested the hypothesis that watermelon juice supplementation would improve nitric oxide bioavailability and exercise performance. Eight healthy recreationally-active adult males reported to the laboratory on two occasions for initial testing without dietary supplementation (control condition). Thereafter, participants were randomly assigned, in a cross-over experimental design, to receive 16 days of supplementation with 300 mL center dot day(-1) of a watermelon juice concentrate, which provided similar to 3.4 g L-citrulline day(-1) and an apple juice concentrate as a placebo. Participants reported to the laboratory on days 14 and 16 of supplementation to assess the effects of the interventions on blood pressure, plasma [L-citrulline], plasma [L-arginine], plasma [nitrite], muscle oxygenation and time-to-exhaustion during severe-intensity exercise. Compared to control and placebo, plasma [L-citrulline] (29 +/- 4, 22 +/- 6 and 101 +/- 23 mu M), [L-arginine] (74 +/- 9 , 67 +/- 13 and 116 +/- 9 mu M) and [nitrite] (102 +/- 29, 106 +/- 21 and 201 +/- 106 nM) were higher after watermelon juice supplementation (P < 0.01). However, systolic blood pressure was higher in the watermelon juice (130 +/- 11) and placebo (131 +/- 9) conditions compared to the control condition (124 +/- 8 mmHg; P < 0.05). The skeletal muscle oxygenation index during moderate-intensity exercise was greater in the watermelon juice condition than the placebo and control conditions (P < 0.05), but time-to-exhaustion during the severe-intensity exercise test (control: 478 +/- 80, placebo: 539 +/- 108, watermelon juice: 550 +/- 143 s) was not significantly different between conditions (P < 0.05). In conclusion, while watermelon juice supplementation increased baseline plasma [nitrite] and improved muscle oxygenation during moderate-intensity exercise, it increased resting blood pressure and did not improvetime-to-exhaustionduring severe-intensity exercise. These findings do not support the use of watermelon juice supplementation as a nutritional intervention to lower blood pressure or improve endurance exercise performance in healthy adults. (C) 2016 Elsevier Inc. All rights reserved.
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