Antioxidant-rich beetroot juice does not adversely affect acute neuromuscular adaptation following eccentric exercise

Clifford, Tom, Bell, Oliver, West, Dan, Howatson, Glyn and Stevenson, Emma (2017) Antioxidant-rich beetroot juice does not adversely affect acute neuromuscular adaptation following eccentric exercise. Journal of Sports Sciences, 35 (8). pp. 812-819. ISSN 0264-0414

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Official URL: http://dx.doi.org/10.1080/02640414.2016.1192670

Abstract

This study examined the effects of beetroot juice on the repeated bout effect (RBE) to eccentric exercise. Twenty-nine recreationally active males performed two bouts of 100-drop jumps, separated by 14–21 days. Using a double-blind, independent groups design, participants consumed either a higher dose beetroot juice (H-BT; 250 ml, n = 10), a lower dose beetroot juice (L-BT; 125 ml, n = 9) or an isocaloric placebo (PLA; 250 ml, n = 10) for 3 days after bout 1; no drinks were consumed after bout 2. Maximal isometric voluntary contraction (MIVC), countermovement jump (CMJ), pressure-pain threshold (PPT) and creatine kinase (CK) were measured pre, post, 24, 48 and 72 h following both bouts. In bout 2, CMJ and MIVC recovered quicker and CK activity was attenuated (versus bout 1) (P < 0.05) in all groups, demonstrating an RBE. At 24 h post bout 1, MIVC was 84.1 ± 16.1, 83.6 ± 11.6, 79.7 ± 15.1% relative to baseline values in the H-BT, L-BT and PLA groups, respectively; at 24 h post bout 2, MIVC recovered to 90.7 ± 13.7, 92.9 ± 6.9, 87.8 ± 6.9, in the H-BT, L-BT and PLA groups, respectively. These findings suggest that supplementation with antioxidant-rich beetroot juice does not adversely affect acute adaptations to a bout of eccentric exercise.

Item Type: Article
Additional Information: This study was funded as part of a doctoral degree that receives financial support from Gs Fresh Ltd.
Uncontrolled Keywords: muscle damage, antioxidants, exercise adaptation, inflammation
Subjects: C600 Sports Science
Department: Faculties > Health and Life Sciences > School of Life Sciences > Sport, Exercise and Rehabilitation
Depositing User: Ay Okpokam
Date Deposited: 20 Jun 2016 08:34
Last Modified: 26 May 2017 05:17
URI: http://nrl.northumbria.ac.uk/id/eprint/27141

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