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Minimal muscle damage after a marathon and no influence of beetroot juice on inflammation and recovery

Clifford, Thomas, Allerton, Dean, Brown, Meghan, Harper, Liam D., Horsburgh, Steven, Keane, Karen, Stevenson, Emma and Howatson, Glyn (2016) Minimal muscle damage after a marathon and no influence of beetroot juice on inflammation and recovery. Applied Physiology, Nutrition, and Metabolism. ISSN 1715-5312

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Abstract

This study examined whether beetroot juice (BTJ) would attenuate inflammation and muscle
damage following a marathon. Using a double blind, independent group’s design, 34 runners
(~16 previous marathons completed) consumed either BTJ or an isocaloric placebo (PLA) for
3 days following a marathon. Maximal isometric voluntary contractions (MIVC),
countermovement jumps (CMJ), muscle soreness, serum cytokines, leucocytosis, creatine
kinase (CK), high sensitivity C-reactive protein (hs-CRP) and aspartate aminotransferase
(AST) were measured pre, post, and on the 2 days after the marathon. CMJ and MIVC were
reduced after the marathon (P<0.05) but no group differences were observed (P>0.05).
Muscle soreness was increased in the day after the marathon (BTJ; 45±48 vs. PLA; 46±39
mm) and had returned to baseline by day 2, irrespective of supplementation (P=0.694).
Cytokines (Interleukin-6; IL-6, interleukin-8, tumour necrosis factor-α) were increased
immediately post-marathon but apart from IL-6 had returned to baseline values by day 1 post.
No interaction effects were evident for IL-6 (P=0.213). Leucocytes increased 1.7 fold after
the race and remained elevated 2 days post, irrespective of supplement (P<0.0001). CK
peaked at 1 day post marathon (BTJ: 965±967 & PLA: 1141±979 IU·L-1) and like AST and
hs-CRP, was still elevated 2 days after the marathon (P<0.05); however, no group differences
were present for these variables. Beetroot juice did not attenuate inflammation or reduce
muscle damage following a marathon, possibly because most of these indices were not
markedly different from baseline values in the days after the marathon.

Item Type: Article
Subjects: Q Science > QP Physiology
Schools: School of Human and Health Sciences
Related URLs:
Depositing User: Liam Harper
Date Deposited: 09 Nov 2016 11:55
Last Modified: 03 Dec 2016 17:04
URI: http://eprints.hud.ac.uk/id/eprint/30013

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