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Int J Sports Med 2014; 35(09): 725-730
DOI: 10.1055/s-0033-1364022
Physiology & Biochemistry
© Georg Thieme Verlag KG Stuttgart · New York

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

C. J. Stewart
1   School of Biomedical Sciences, Charles Sturt University, Bathurst, Australia
,
D. G. Whyte
3   School of Human Movement Studies, Charles Sturt University, Bathurst, Australia
,
J. Cannon
1   School of Biomedical Sciences, Charles Sturt University, Bathurst, Australia
,
J. Wickham
2   School of Exercise Science, Australian Catholic University, Melbourne, Australia
,
F. E. Marino
1   School of Biomedical Sciences, Charles Sturt University, Bathurst, Australia
› Author Affiliations
Further Information

Publication History



accepted after revision 11 December 2013

Publication Date:
27 February 2014 (online)

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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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