Beetroot juice is more beneficial than sodium nitrate for attenuating muscle pain after strenuous eccentric-bias exercise
Beetroot juice is more beneficial than sodium nitrate for attenuating muscle pain after strenuous eccentric-bias exercise
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DOI：
10.1139/apnm-2017-0238
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发表时间：
2017-11-01
影响因子：
3.4
通讯作者：
Stevenson, Emma J.
中科院分区：
文献类型：
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作者：
Clifford, Tom;Howatson, Glyn;Stevenson, Emma J.
本研究的目的是比较甜菜根汁 (BTJ) 和纯硝酸盐饮料（硝酸钠；SN）对运动引起的肌肉损伤 (EIMD) 指数的影响。 30 名休闲活跃的男性在进行 100 次跳伞后立即以及在 24 小时和 48 小时饮用 BTJ (n = 10)、硝酸盐匹配的 SN 饮料 (n = 10) 或等热量安慰剂 (PLA；n = 10)。为了评估肌肉损伤，在跳伞之前、之后立即以及之后 24、48 和 72 小时测量最大等长随意收缩 (MIVC)、反向运动跳跃 (CMJ)、压力疼痛阈值 (PPT)、肌酸激酶 (CK) 和高敏 C 反应蛋白 (hs-CRP)。 BTJ 和 SN 增加血清一氧化氮，在摄入后 2 小时达到峰值（分别为 136 +/- 78 和 189 +/- 79 mu mol.L-1）。运动后所有组的 PPT 均下降（P = 0.001），但与 SN 和 PLA 相比，BTJ 的 PPT 减弱（P = 0.043）。 BTJ 后 72 小时时 PPT 为基线值的 104% +/- 26%，SN 后为 94% +/- 16%，PLA 后为 91% +/- 19%。所有组的 MIVC 和 CMJ 均在运动后减少（-15% 至 25%），并且在 72 小时内均未恢复至基线；然而，没有观察到组间差异（P > 0.05）。运动后血清CK升高，但不存在组间差异（P > 0.05）。 hsCRP 水平未因运动方案而改变（P > 0.05）。这些数据表明，对于减轻与 EIMD 相关的肌肉疼痛，BTJ 补充剂比 SN 更有效，并且任何镇痛作用都可能是由于 BTJ 中除硝酸盐以外的植物营养素或它们之间的相互作用所致。
The aim of this study was to compare the effects of beetroot juice (BTJ) and a nitrate only drink (sodium nitrate; SN) on indices of exercise-induced muscle damage (EIMD). Thirty recreationally active males consumed either BTJ (n = 10), a nitrate-matched SN drink (n = 10), or an isocaloric placebo (PLA; n = 10) immediately and at 24 and 48 h after performing 100 drop jumps. To assess muscle damage, maximal isometric voluntary contractions (MIVCs), countermovement jumps (CMJs), pressure-pain threshold (PPT), creatine kinase (CK), and high-sensitivity C-reactive protein (hs-CRP) were measured before, immediately after and at 24, 48, and 72 h following the drop jumps. BTJ and SN increased serum nitric oxide, which peaked at 2 h post-ingestion (136 +/- 78 and 189 +/- 79 mu mol.L-1, respectively). PPT decreased in all groups postexercise (P = 0.001), but was attenuated with BTJ compared with SN and PLA (P = 0.043). PPT was 104% +/- 26% of baseline values at 72 h after BTJ, 94% +/- 16% after SN, and 91% +/- 19% after PLA. MIVC and CMJ were reduced following exercise (-15% to 25%) and did not recover to baseline by 72 h in all groups; however, no group differences were observed (P > 0.05). Serum CK increased after exercise but no group differences were present (P > 0.05). hsCRP levels were unaltered by the exercise protocol (P > 0.05). These data suggest that BTJ supplementation is more effective than SN for attenuating muscle pain associated with EIMD, and that any analgesic effects are likely due to phytonutrients in BTJ other than nitrate, or interactions between them.