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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
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accepted after revision 11. Dezember 2013

Publikationsdatum:
27. Februar 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
 

  • References

  • 1 Armstrong LE, Costill DL, Fink WJ. Influence of diuretic-induced dehydration on competitive running performance. Med Sci Sports Exerc 1985; 17: 456-461
    CrossrefPubMedSuche in Google Scholar
  • 2 Armstrong LE, Maresh CM, Gabaree CV, Hoffman JR, Kavouras SA, Kenefick RW, Castellani JW, Ahlquist LE. Thermal and circulatory responses during exercise: effects of hypohydration, dehydration, and water intake. J Appl Physiol 1997; 82: 2028-2035
    PubMedSuche in Google Scholar
  • 3 Bigard AX, Hervé S, Claveyrolas G, Martin S, Thimonier B, Arnaud MJ. Effects of dehydration and rehydration on EMG changes during fatiguing contractions. Med Sci Sports Exerc 2001; 10: 1694-1700
    PubMedSuche in Google Scholar
  • 4 Borg G. Psychophysical scaling with applications in physical work and the perception of exertion. Scandinavian J Env Hlth 1990; 16: 55-58
    PubMedSuche in Google Scholar
  • 5 Buono MJ, Wall AJ. Effect of hypohydration on core temperature during exercise in temperate and hot environments. Eur J Physiol 2000; 440: 476-480
    CrossrefPubMedSuche in Google Scholar
  • 6 Burge CM, Carey MF, Payne WR. Rowing performance, fluid balance, and metabolic function following dehydration and rehydration. Med Sci Sports Exerc 1993; 25: 1358-1364
    PubMedSuche in Google Scholar
  • 7 Cannon J, Kay D, Tarpenning KM, Marino FE. Reproducibility and changes in twitch properties associated with age and resistance training in young and elderly women. Scandinavian J Med Sci Sports 2008; 18: 627-635
    PubMedSuche in Google Scholar
  • 8 Evetovich TK, Boyd JC, Drake SM, Eschbach LC, Magal M, Soukup JT, Webster MJ, Whitehead MT, Weir JP. Effect of moderate dehydration on torque, electromyography, and mechanomyography. Muscle Nerve 2002; 26: 225-231
    CrossrefPubMedSuche in Google Scholar
  • 9 Goulet ED. Effect of exercise-induced dehydration on endurance performance: evaluating the impact of exercise protocols on outcomes using a meta-analytic procedure. Br J Sports Med 2013; 47: 679-686
    CrossrefPubMedSuche in Google Scholar
  • 10 Goulet EDB, Rousseau SF, Lamboley CRH, Plante GE, Dionne IJ. Pre-Exercise Hyperhydration Delays Dehydration and Improves Endurance Capacity during 2 h of Cycling in a Temperate Climate. J Physiol Anthropol 2008; 27: 263-271
    CrossrefPubMedSuche in Google Scholar
  • 11 Greiwe JS, Staffey K, Melrose DR, Narve MD, Kowlton RG. Effects of dehydration on isometric muscular strength and endurance. Med Sci Sports Exerc 1998; 30: 284-288
    PubMedSuche in Google Scholar
  • 12 Harriss DJ, Atkinson G. Ethical standards in sport and exercise science research; 2014 update. Int J Sports Med 2013; 34: 1025-1028
    Thieme ConnectPubMedSuche in Google Scholar
  • 13 Judelson DA, Maresh CM, Farrell MJ, Yamamoto LM, Armstrong LE, Kraemer WJ, Volek JS, Spiering BA, Casa DJ, Anderson JM. Effect of hydration state on strength, power, and resistance exercise performance. Med Sci Sports Exerc 2007; 39: 1817
    CrossrefPubMedSuche in Google Scholar
  • 14 Kay D, Marino FE. Failure of fluid ingestion to improve self-paced exercise performance in moderate-to-warm humid environments. J Therm Biol 2003; 28: 29-34
    CrossrefPubMedSuche in Google Scholar
  • 15 Kenefick RW, Cheuvront SN, Palombo LJ, Ely BR, Sawka MN. Skin temperature modifies the impact of hypohydration on aerobic performance. J Appl Physiol 2010; 109: 79-86
    CrossrefPubMedSuche in Google Scholar
  • 16 Kenefick RW, Hazzard MP, Mahood NV, Castellani JW. Thirst sensations and AVP responses at rest and during exercise-cold exposure. Med Sci Sports Exerc 2004; 36: 1528-1534
    CrossrefPubMedSuche in Google Scholar
  • 17 Laitano O, Kalsi KK, Pearson J, Lotlikar M, Reischak-Oliveira A, González-Alonso J. Effects of graded exercise-induced dehydration and rehydration on circulatory markers of oxidative stress across the resting and exercising human leg. Eur J Appl Physiol 2011; 112: 1937-1944
    PubMedSuche in Google Scholar
  • 18 Levels K, Koning JJ, Foster C, Daanen HAM. The effect of skin temperature on performance during a 7.5-km cycling time trial. Eur J Appl Physiol 2012; 112: 3387-3395
    CrossrefPubMedSuche in Google Scholar
  • 19 Marino FE, Cannon J, Kay D. Neuromuscular responses to hydration in moderate to warm ambient conditions during self-paced high-intensity exercise. Br J Sports Med 2010; 44: 961-967
    CrossrefPubMedSuche in Google Scholar
  • 20 Marino FE, Lambert MI, Noakes TD. Superior performance of African runners in warm humid but not in cool environmental conditions. J Appl Physiol 2004; 96: 124-130
    CrossrefPubMedSuche in Google Scholar
  • 21 Minshull C, James L. The effects of hypohydration and fatigue on neuromuscular activation performance. Appl Physiol Nutr Metab 2013; 38: 21-26
    CrossrefPubMedSuche in Google Scholar
  • 22 Montain SJ, Smith SA, Mattot RP, Zientara GP, Jolesz FA, Sawka MN. Hypohydration effects on skeletal muscle performance and metabolism: a 31P-MRS study. J Appl Physiol 1998; 84: 1889-1894
    PubMedSuche in Google Scholar
  • 23 Moquin A, Mazzeo RS. Effect of mild dehydration on the lactate threshold in women. Med Sci Sports Exerc 2000; 32: 396-402
    CrossrefPubMedSuche in Google Scholar
  • 24 Morrison S, Sleivert GG, Cheung SS. Passive hyperthermia reduces voluntary activation and isometric force production. Eur J Appl Physiol 2004; 91: 729-736
    CrossrefPubMedSuche in Google Scholar
  • 25 Nybo L, Jensen T, Nielsen B, González-Alonso J. Effects of marked hyperthermia with and without dehydration on VO2 kinetics during intense exercise. J Appl Physiol 2001; 90: 1057-1064
    PubMedSuche in Google Scholar
  • 26 Riebe D, Maresh CM, Armstrong LE, Kenefick RW, Castellani JW, Echegaray M, Clark BA, Camaione DN. Effects of oral and intravenous rehydration on ratings of perceived exertion and thirst. Med Sci Sports Exerc 1997; 29: 117-124
    PubMedSuche in Google Scholar
  • 27 Saboisky J, Marino FE, Kay D, Cannon J. Exercise heat stress does not reduce central activation to non-exercised human skeletal muscle. Exp Physiol 2003; 88: 783-790
    CrossrefPubMedSuche in Google Scholar
  • 28 Saltin B. Aerobic and anaerobic work capacity after dehydration. J Appl Physiol 1964; 19: 1114-1118
    PubMedSuche in Google Scholar
  • 29 Sawka MN, Burke LM, Eichner ER, Maughan RJ, Montain SJ, Stachenfeld NS. ACSM Position Stand: Exercise and fluid replacement. Med Sci Sports Exerc 2007; 39: 377-390
    CrossrefPubMedSuche in Google Scholar
  • 30 Sharwood K, Collins M, Goedecke J, Wilson G, Noakes T. Weight changes, sodium levels, and performance in the South African Ironman Triathlon. Clin J Sport Med 2002; 12: 391-399
    CrossrefPubMedSuche in Google Scholar
  • 31 Shibasaki M, Aoki K, Morimoto K, Johnson JM, Takamata A. Plasma hyperosmolality elevates the internal temperature threshold for active thermoregulatory vasodilation during heat stress in humans. Am J Physiol 2009; 297: R1706-R1712
    PubMedSuche in Google Scholar
  • 32 Slater GJ, Rice AJ, Sharpe K, Tanner R, Jenkins D, Gore CJ, Hahn AG. Impact of acute weight loss and/or thermal stress on rowing ergometer performance. Med Sci Sports Exerc 2005; 37: 1387
    CrossrefPubMedSuche in Google Scholar
  • 33 Tatterson AJ, Hahn AG, Martini DT, Febbraio MA. Effects of heat stress on physiological responses and exercise performance in elite cyclists. J Sci Med Sport 2000; 3: 186-193
    CrossrefPubMedSuche in Google Scholar
  • 34 Tucker R, Marle T, Lambert EV, Noakes TD. The rate of heat storage mediates an anticipatory reduction in exercise intensity during cycling at a fixed rating of perceived exertion. J Physiol 2006; 574: 905-915
    CrossrefPubMedSuche in Google Scholar
  • 35 Whyte DG, Johnson AK. Thermoregulatory role of periventricular tissue surrounding the anteroventral third ventricle (AV3V) during acute heat stress in the rat. Clin Exp Pharmacol Physiol 2005; 32: 457-461
    CrossrefPubMedSuche in Google Scholar
  • 36 Zouhal H, Groussard C, Minter G, Vincent S, Cretual A, Gratas-Delamarche A, Delamarche P, Noakes TD. Inverse relationship between percentage body weight change and finishing time in 643 forty-two-kilometre marathon runners. Br J Sports Med 2011; 45: 1101-1105
    CrossrefPubMedSuche in Google Scholar