Exercise-induced Dehydration Does not Alter Time Trial or Neuromuscular Performance

C. J. Stewart; D. G. Whyte; J. Cannon; J. Wickham; F. E. Marino

doi:10.1055/s-0033-1364022

International Journal of Sports Medicine, Inhaltsverzeichnis

Int J Sports Med 2014; 35(09): 725-730
DOI: 10.1055/s-0033-1364022

Physiology & Biochemistry

Exercise-induced Dehydration Does not Alter Time Trial or Neuromuscular Performance

C. J. Stewart

¹School of Biomedical Sciences, Charles Sturt University, Bathurst, Australia

,

D. G. Whyte

³School of Human Movement Studies, Charles Sturt University, Bathurst, Australia

,

J. Cannon

¹School of Biomedical Sciences, Charles Sturt University, Bathurst, Australia

,

J. Wickham

²School of Exercise Science, Australian Catholic University, Melbourne, Australia

,

F. E. Marino

¹School of Biomedical Sciences, Charles Sturt University, Bathurst, Australia

› Institutsangaben

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.

Key words

dehydration - neuromuscular - temperature

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Referenzen

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