Repeated muscle damage blunts the increase in heat strain during subsequent exercise heat stress : WestminsterResearch

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Title	Repeated muscle damage blunts the increase in heat strain during subsequent exercise heat stress
Authors	Dolci, A., Fortes, M.B., Walker, F.S., Haq, A., Riddle, T. and Walsh, N.P.
Abstract	Exercise-induced muscle damage (EIMD) has recently been shown to increase heat strain during exercise heat stress (HS), and represents a risk factor for exertional heat illness (EHI). We hypothesised that a repeated bout of EIMD blunts the increase in rectal temperature (T re) during subsequent endurance exercise in the heat. Sixteen non-heat-acclimated males were randomly allocated to EIMD (n = 9) or control (CON, n = 7). EIMD performed a downhill running treatment at -10 % gradient for 60 min at 65 % [Formula: see text]O2max in 20 °C, 40 % RH. CON participants performed the same treatment but at +1 % gradient. Following treatment, participants rested for 30 min, then performed HS (+1 % gradient running for 40 min at 65 % [Formula: see text]O2max in 33 °C, 50 % RH) during which thermoregulatory measures were assessed. Both groups repeated the treatment and subsequent HS 14 days later. Isometric quadriceps strength was assessed at baseline, and 48 h post-treatment. The decrease in leg strength 48 h post-EIMD trial 1 (-7.5 %) was absent 48 h post-EIMD trial 2 (+2.9 %) demonstrating a repeated bout effect. Final T re during HS was lower following EIMD trial 2 (39.25 ± 0.47 °C) compared with EIMD trial 1 (39.59 ± 0.49 °C, P < 0.01), with CON showing no difference. Thermal sensation and the T re threshold for sweating onset were also lower during HS on EIMD trial 2. The repeated bout effect blunted the increase in heat strain during HS conducted after EIMD. Incorporating a muscle-damaging bout into training could be a strategy to reduce the risk of EHI and improve endurance performance in individuals undertaking heavy exercise with an eccentric component in the heat.
Keywords	Thermoregulation · Eccentric · Inflammation · Muscle injury · Hyperthermia · Cross-adaptation · Heat illness · Heat stroke · Heat shock protein
Journal	European Journal of Applied Physiology
Journal citation	115 (7), pp. 1577-1588
ISSN	1439-6319
Year	2015
Publisher	Springer
Digital Object Identifier (DOI)	https://doi.org/10.1007/s00421-015-3143-7
Web address (URL)	http://www.ncbi.nlm.nih.gov/pubmed/25736783
Published	04 Mar 2015

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Repeated muscle damage blunts the increase in heat strain during subsequent exercise heat stress

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