The effects of beetroot juice supplementation on indices of muscle damage following eccentric exercise
The effects of beetroot juice supplementation on indices of muscle damage following eccentric exercise
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DOI：
10.1007/s00421-015-3290-x
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发表时间：
2016-02-01
影响因子：
3
通讯作者：
Stevenson, Emma J.
中科院分区：
文献类型：
--
作者：
Clifford, Tom;Bell, Oliver;Stevenson, Emma J.
目的富含抗氧化剂和抗炎植物化学物质的食物可能会减轻骨骼肌损伤;因此，本研究探讨了食用富含抗氧化剂的甜菜根汁是否会减轻离心运动对骨骼肌的损伤作用。方法采用双盲、独立组设计，30名娱乐活跃的男性被分配食用高剂量的甜菜根汁（H-BT; 250 ml）、较低剂量的甜菜根汁（L-BT; 125 ml）或等热量安慰剂（PLA; 250 ml），在完成100滴跳跃后立即（x3份）、24（x2份）和48 h（x2份）。最大等长自主收缩（MIVC）、反向运动跳跃（CMJ）、压痛阈值（PPT）、肌酸激酶（CK）、白细胞介素-6（IL-6）、白细胞介素-8（IL-8）和肿瘤坏死因子-α分别在术前、术后、术后2个月和术后3个月测量肿瘤坏死因子-α（TNF-α）。（仅血液指标），24，结果CMJ功能恢复较快（相对于基线）48时H-BT与PLA（91.7 +/- 12.2 vs. 74.4 +/-17.3%; P = 0.009，ES = 1.00）和运动后72 h（93.4 +/- 7.7 vs. 86 +/-5.9%; P = 0.046，ES = 1.25）。运动后24、48和72 h，H-BT和L-BT的PPT均大于PLA（P < 0.001）;运动后72 h，H-BT和L-BT的PPT已恢复至基线水平，但PLA仍降低（基线值的80.1 ± 28.9%）。甜菜根汁对MIVC、CK、IL-6、TNF-alpha和IL-8均无影响（P > 0.05）。结论急性补充甜菜根汁可减轻离心运动引起的肌肉酸痛和CMJ表现下降;需要进一步研究甜菜根汁的抗炎作用以阐明其确切机制。
Purpose Foods rich in antioxidant and anti-inflammatory phytochemicals might attenuate skeletal muscle damage; thus, the present study investigated whether consuming an antioxidant rich beetroot juice would attenuate the muscle-damaging effects of eccentric exercise.Methods Using a double blind, independent groups design, 30 recreationally active males were allocated to consume a high dose of beetroot juice (H-BT; 250 ml), a lower dose of beetroot juice (L-BT; 125 ml), or an isocaloric placebo (PLA; 250 ml) immediately (x3 servings), 24 (x2 servings) and 48 h (x2 servings) following completion of 100-drop jumps. Maximal isometric voluntary contractions (MIVC), countermovement jumps (CMJ), pressure pain threshold (PPT), creatine kinase (CK), interleukin-6 (IL-6), interleukin-8 (IL-8) and tumour necrosis factor-alpha (TNF-alpha) were measured pre, post, 2 (blood indices only), 24, 48 and 72 h following the drop jumps.Results CMJ performance recovered quicker (relative to baseline) in H-BT vs. PLA at 48 (91.7 +/- 12.2 vs. 74.4 +/- 17.3 %; P = 0.009, ES = 1.00) and 72 h postexercise (93.4 +/- 7.7 vs. 86 +/- 5.9 %; P = 0.046, ES = 1.25). PPT was greater in both the H-BT and L-BT vs. PLA at 24, 48 and 72 h postexercise (P < 0.001); PPT had returned to baseline in H-BT and L-BT at 72 h postexercise, but was still reduced in PLA (80.1 +/- 28.9 % of baseline values). MIVC, CK, IL-6, TNF-alpha and IL-8 were unaffected by beetroot juice (P > 0.05).Conclusions Acute beetroot juice supplementation attenuated muscle soreness and decrements in CMJ performance induced by eccentric exercise; further research on the anti-inflammatory effects of beetroot juice are required to elucidate the precise mechanisms.