Exercise-induced dehydration does not alter time trial or neuromuscular performance

Journal article


Stewart, C. J, Whyte, Douglas G.., Cannon, Jack, Wickham, James and Marino, Frank E. 2014. Exercise-induced dehydration does not alter time trial or neuromuscular performance. International Journal of Sports Medicine. 35 (9), pp. 725 - 730. https://doi.org/10.1055/s-0033-1364022
AuthorsStewart, C. J, Whyte, Douglas G.., Cannon, Jack, Wickham, James and Marino, Frank E.
Abstract

This study examined the effect of exercise-induced dehydration by ~4% body mass loss on 5-km cycling time trial (TT) performance and neuromuscular drive, independent of hyperthermia. 7 active males were dehydrated on 2 occasions, separated by 7 d. Participants remained dehydrated (DEH, −3.8±0.5%) or were rehydrated (REH, 0.2±0.6%) over 2 h before completing the TT at 18–25 °C, 20–30% relative humidity. Neuromuscular function was determined before dehydration and immediately prior the TT. The TT started at the same core temperature (DEH, 37.3±0.3°C; REH, 37.0±0.2 °C (P > 0.05). Neither TT performance (DEH, 7.31±1.5 min; REH, 7.10±1.3 min (P > 0.05)) or % voluntary activation were affected by dehydration (DEH, 88.7±6.4%; REH, 90.6±6.1% (P > 0.05)). Quadriceps peak torque was significantly elevated in both trials prior to the TT (P < 0.05), while a 19% increase in the rate of potentiated peak twitch torque development (P < 0.05) was observed in the DEH trial only. All other neuromuscular measures were similar between trials. Short duration TT performance and neuromuscular function are not reduced by dehydration, independent of hyperthermia.

Keywordsdehydration; neuromuscular; temperature
Year2014
JournalInternational Journal of Sports Medicine
Journal citation35 (9), pp. 725 - 730
PublisherGeorg Thieme Verlag
ISSN1439-3964
Digital Object Identifier (DOI)https://doi.org/10.1055/s-0033-1364022
Web address (URL)http://ezproxy.acu.edu.au/login?url=http://dx.doi.org/10.1055/s-0033-1364022
Page range725 - 730
Research GroupSports Performance, Recovery, Injury and New Technologies (SPRINT) Research Centre
Place of publicationGermany
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