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Clifford, Tom, Allerton, Dean M, Brown, Meghan A 
ORCID: 0000-0003-3260-977X, Harper, Liam, Horsburgh, Steven, Keane, Karen M, Stevenson, Emma J and Howatson, Glyn
(2017)
Minimal muscle damage after a marathon and no influence of beetroot juice on inflammation and recovery.
Applied Physiology, Nutrition, and Metabolism, 42 (3).
pp. 263-270.
doi:10.1139/apnm-2016-0525
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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 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-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, 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.
| Item Type: | Article |
|---|---|
| Article Type: | Article |
| Uncontrolled Keywords: | Exercise recovery; betalains; running; marathon; Functional foods; neuromuscular function. |
| Related URLs: | |
| Subjects: | G Geography. Anthropology. Recreation > GV Recreation Leisure > GV557 Sports > GV1060 Track and field athletics G Geography. Anthropology. Recreation > GV Recreation Leisure > GV557 Sports R Medicine > RC Internal medicine > RC1200 Sports Medicine |
| Divisions: | Schools and Research Institutes > School of Education and Science |
| Research Priority Areas: | Health, Life Sciences, Sport and Wellbeing |
| Depositing User: | Anne Pengelly |
| Date Deposited: | 07 Nov 2016 14:59 |
| Last Modified: | 31 Aug 2023 09:09 |
| URI: | https://eprints.glos.ac.uk/id/eprint/4149 |
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