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

Lookup NU author(s): Dr Tom Clifford, Dr Dean Allerton, Professor Emma Stevenson

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This is the authors' accepted manuscript of an article that has been published in its final definitive form by Canadian Science Publishing, 2017.

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Abstract

© 2017, Canadian Science Publishing. All rights reserved.This study examined whether beetroot juice (BTJ) would attenuate inflammation and muscle damage following a marathon. Using a double blind, independent group design, 34 runners (each having completed ca. ~16 previous marathons) 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 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-÷) 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, and 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.


Publication metadata

Author(s): Clifford T, Allerton DM, Brown MA, Harper L, Horsburgh S, Keane KM, Stevenson EJ, Howatson G

Publication type: Article

Publication status: Published

Journal: Applied Physiology, Nutrition and Metabolism

Year: 2017

Volume: 42

Issue: 3

Pages: 263-270

Print publication date: 01/03/2017

Online publication date: 09/11/2016

Acceptance date: 31/10/2016

Date deposited: 19/02/2018

ISSN (print): 1715-5312

ISSN (electronic): 1715-5320

Publisher: Canadian Science Publishing

URL: https://doi.org/10.1139/apnm-2016-0525

DOI: 10.1139/apnm-2016-0525


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