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European Journal of Applied Physiology

, Volume 109, Issue 5, pp 887–898 | Cite as

Thermoregulation, pacing and fluid balance during mass participation distance running in a warm and humid environment

  • Jason K. W. LeeEmail author
  • Amanda Q. X. Nio
  • Chin Leong Lim
  • Eunice Y. N. Teo
  • Christopher ByrneEmail author
Original Article

Abstract

Deep body temperature (T c), pacing strategy and fluid balance were investigated during a 21-km road race in a warm and humid environment. Thirty-one males (age 25.3 ± 3.2 years; maximal oxygen uptake 59.1 ± 4.2 ml kg−1 min−1) volunteered for this study. Continuous T c responses were obtained in 25 runners. Research stations at approximately 3-km intervals permitted accurate assessment of split times and fluid intake. Environmental conditions averaged 26.4°C dry bulb temperature and 81% relative humidity. Peak T c was 39.8 ± 0.5 (38.5–40.7) °C with 24 runners achieving T c > 39.0°C, 17 runners ≥39.5°C, and 10 runners ≥40.0°C. In 12 runners attaining peak T c ≥ 39.8°C, running speed did not differ significantly when T c was below or above this threshold (208 ± 15 cf. 205 ± 24 m min−1; P = 0.532). Running velocity was the main significant predictor variable of ∆T c at 21 km (R 2 = 0.42, P < 0.001) and was the main discriminating variable between hyperthermic (T c ≥ 39.8°C) and normothermic runners (T c < 39.8°C) up to 11.8 km. A reverse J-shaped pacing profile characterised by a marked reduction in running speed after 6.9 km and evidence of an end-spurt in 16 runners was observed. Variables relating to fluid balance were not associated with any T c parameters or pacing. We conclude that hyperthermia, defined by a deep body temperature greater than 39.5°C, is common in trained individuals undertaking outdoor distance running in environmental heat, without evidence of fatigue or heat illness.

Keywords

Core temperature Hyperthermia Hydration Fatigue Performance 

Notes

Acknowledgments

The authors express their thanks to the volunteers for their participation. We also thank HQ Commandos and HQ Signal (4th Singapore Armoured Brigade) of the Singapore Armed Forces for their participation and support in this research. Finally, we would like to thank Margaret Yap, Teo Ya Shi, Sharon Sng, Chia Ee Von, Jacinta Yeo, David Fan, Priscilla Fan, Grace Teo, Caleb Gan, Joselin Lim, Soh Boon Kee, Evania Tan, Lydia Law, Ian Ng and the student volunteers from ITE College East for their role in data collection. We are grateful to Dr Raija Laukkanen at Polar Electro Oy, Kempele, Finland, for donating the Polar RS800sd running computer. Dr Chris Byrne was supported by an international outgoing short visit grant from the Royal Society, UK.

References

  1. Abbiss CR, Laursen PB (2008) Describing and understanding pacing strategies during athletic competition. Sports Med 38:252–293CrossRefGoogle Scholar
  2. Armstrong LE, Maresh CM, Gabaree CV, Hoffman JR, Kavouras SA, Kenefick RW, Castellani JW, Ahlquist LE (1997) Thermal and circulatory responses during exercise: effects of hypohydration, dehydration, and water intake. J Appl Physiol 82:2028–2035PubMedGoogle Scholar
  3. Bland JM, Altman DG (1986) Statistical methods for assessing agreement between two methods of clinical measurement. Lancet 1:307–310PubMedGoogle Scholar
  4. Burke LM, Wood C, Pyne DB, Telford RD, Saunders PU (2005) Effect of carbohydrate intake on half-marathon performance of well-trained runners. Int J Sport Nutr Exerc Metab 15:573–589PubMedGoogle Scholar
  5. Byrne C, Lim CL (2007) The ingestible telemetric body core temperature sensor: a review of validity and exercise applications. Br J Sports Med 41:126–133. doi: 10.1136/bjsm.2006.026344 CrossRefPubMedGoogle Scholar
  6. Byrne C, Lee JKW, Chew SAN, Lim CL, Tan EYM (2006) Continuous thermoregulatory responses to mass-participation distance running in heat. Med Sci Sports Exerc 38:803–810. doi: 10.1249/01.mss.0000218134.74238.6a CrossRefPubMedGoogle Scholar
  7. Casa DJ, Armstrong LE, Hillman SK, Montain SJ, Reiff RV, Rich BSE, Roberts WO, Stone JA (2000) National Athletic Trainers’ Association position statement: fluid replacement for athletes. J Athl Train 35:212–224PubMedGoogle Scholar
  8. Cheuvront SN, Haymes EM (2001) Ad libitum fluid intakes and thermoregulatory responses of female distance runners in three environments. J Sports Sci 19:845–854CrossRefPubMedGoogle Scholar
  9. Costill DL, Kammer WF, Fisher A (1970) Fluid ingestion during distance running. Arch Environ Health 21:520–525PubMedGoogle Scholar
  10. DuBois D, DuBois EF (1916) A formula to estimate the approximate surface area if height and weight be known. Arch Intern Med 17:863–871Google Scholar
  11. Dugas JP, Oosthuizen U, Tucker R, Noakes TD (2009) Rates of fluid ingestion alter pacing but not thermoregulatory responses during prolonged exercise in hot and humid conditions with appropriate convective cooling. Eur J Appl Physiol 105:69–80. doi: 10.1007/s00421-008-0876-6 CrossRefPubMedGoogle Scholar
  12. Ely BR, Ely MR, Cheuvront SN, Kenefick RW, DeGroot DW, Montain SJ (2009) Evidence against a 40°C core temperature threshold for fatigue in humans. J Appl Physiol 107:1519–1525. doi: 10.1152/japplphysiol.00577.2009 CrossRefPubMedGoogle Scholar
  13. Eston R, Hawes M, Martin A, Reilly T (2009) Human body composition. In: Eston R, Reilly T (eds) Kinanthropometry and exercise physiology laboratory manual: tests, procedures and data, vol 1: anthropometry. Routledge, London, pp 3–53Google Scholar
  14. Gagge AP, Gonzalez RR (1996) Mechanisms of heat exchange: biophysics and physiology. In: Fregly MJ, Blatteis CM (eds) Handbook of physiology: environmental physiology. American Physiological Society, Bethesda, pp 45–84Google Scholar
  15. Galloway SD, Maughan RJ (1997) Effects of ambient temperature on the capacity to perform prolonged cycle exercise in man. Med Sci Sports Exerc 29:1240–1249PubMedGoogle Scholar
  16. Gonzalez-Alonso J, Teller C, Andersen SL, Jensen FB, Hyldig T, Nielsen B (1999) Influence of body temperature on the development of fatigue during prolonged exercise in the heat. J Appl Physiol 86:1032–1039PubMedGoogle Scholar
  17. Hausswirth CY, Le Meur Y, Couturier A, Bernard T, Brisswalter J (2009) Accuracy and repeatability of the Polar® RS800sd to evaluate stride rate and running speed. Int J Sports Med 30:354–359. doi: 10.1055/s-0028-1105936 CrossRefPubMedGoogle Scholar
  18. Havenith G, Coenen JML, Kistemaker L, Kenney WL (1998) Relevance of individual characteristics for human heat stress response is dependent on exercise intensity and climate type. Eur J Appl Physiol 77:231–241. doi: 10.1007/s004210050327 CrossRefGoogle Scholar
  19. Hayward JS, Eckerson JD, Dawson BT (1986) Effect of mesomorphy on hyperthermia during exercise in a warm, humid environment. Am J Phys Anthropol 70:11–17. doi: 10.1002/ajpa.1330700104 CrossRefPubMedGoogle Scholar
  20. Hew-Butler T, Verbalis JG, Noakes TD (2006) International Marathon Medical Directors Association Updated fluid recommendation: position statement from the International Marathon Medical Directors Association (IMMDA). Clin J Sport Med 16:283–292CrossRefPubMedGoogle Scholar
  21. King RF, Cooke C, Carroll S, O’Hara J (2008) Estimating changes in hydration status from changes in body mass: considerations regarding metabolic water and glycogen storage. J Sports Sci 26:1361–1363CrossRefPubMedGoogle Scholar
  22. Margaria R, Cerretelli P, Aghemo P, Sassi G (1963) Energy cost of running. J Appl Physiol 18:367–370PubMedGoogle Scholar
  23. Marino FE (2004) Anticipatory regulation and avoidance of catastrophe during exercise-induced hyperthermia. Comp Biochem Physiol B Biochem Mol Biol 139:561–569. doi: 10.1016/j.cbpc.2004.09.010 CrossRefPubMedGoogle Scholar
  24. Maron MB, Wagner JA, Horvarth SM (1977) Thermoregulatory responses during competitive marathon running. J Appl Physiol 42:909–914PubMedGoogle Scholar
  25. Martin AD, Spenst LF, Drinkwater DT, Clarys JP (1990) Anthropometric estimation of muscle mass in men. Med Sci Sports Exerc 22:729–733CrossRefPubMedGoogle Scholar
  26. Maughan RJ, Leiper JB, Thompson J (1985) Rectal temperature after marathon running. Br J Sports Med 19:192–195CrossRefPubMedGoogle Scholar
  27. Maughan RJ, Shirreffs SM, Leiper JB (2007) Errors in the estimation of hydration status from changes in body mass. J Sports Sci 25:797–804. doi: 10.1080/02640410600875143 CrossRefPubMedGoogle Scholar
  28. Mitchell JW, Nadel ER, Stolwijk JA (1972) Respiratory weight losses during exercise. J Appl Physiol 32:474–476PubMedGoogle Scholar
  29. Montain SJ, Coyle EF (1992) Influence of graded dehydration on hyperthermia and cardiovascular drift during exercise. J Appl Physiol 73:1340–1350PubMedGoogle Scholar
  30. Noakes TD (2002) IMMDA advisory statement of guidelines for fluid replacement during marathon running. New Stud Athl 17:15–24Google Scholar
  31. Noakes TD, Myburgh KH, Du Plessis J, Lang L, Lambert M, Van Der Riet C, Schall R (1991) Metabolic rate, not percent dehydration, predicts rectal temperature in marathon runners. Med Sci Sports Exerc 23:443–449PubMedGoogle Scholar
  32. Nybo L, Nielsen B (2001) Hyperthermia and central fatigue during prolonged exercise in humans. J Appl Physiol 91:1055–1060PubMedGoogle Scholar
  33. Parsons K (2003) Measurement methods and assessment techniques. In: Human thermal environments: the effect of hot, moderate and cold environments on human health, comfort and performance. Taylor and Francis, London, pp 93–130Google Scholar
  34. Passe D, Horn M, Stofan J, Horswill C, Murray R (2007) Voluntary dehydration in runners despite favorable conditions for fluid intake. Int J Sport Nutr Exerc Metab 17:284–295PubMedGoogle Scholar
  35. Pugh LG (1970) Oxygen intake in track and treadmill running with observations on the effect of air resistance. J Physiol 207:823–835PubMedGoogle Scholar
  36. Pugh LG, Corbett JL, Johnson RH (1967) Rectal temperatures, weight losses, and sweat rates in marathon running. J Appl Physiol 23:347–352PubMedGoogle Scholar
  37. Robinson S (1963) Temperature regulation in exercise. Pediatrics 2:691–702Google Scholar
  38. Rothstein A, Adolph EF, Wills JH (1947) Voluntary dehydration. In: Adolph EF, and Associates (eds) Physiology of man in the desert. Interscience, New York, pp 254–270Google Scholar
  39. Sawka MN, Burke LM, Eichner ER, Maughan RJ, Stachenfeld NS (2007) American College of Sports Medicine position stand. Exercise and fluid replacement. Med Sci Sports Exerc 39:377–390. doi: 10.1249/mss.0b013e31802ca597 Google Scholar
  40. Selley EA, Kolbe T, Van Zyl CG, Noakes TD, Lambert MI (1995) Running intensity as determined by heart rate is the same in fast and slow runners in both the 10- and 21-km races. J Sports Sci 13:405–410CrossRefPubMedGoogle Scholar
  41. Tatterson AJ, Hahn AG, Martin DT, Febbraio MA (2000) Effects of heat stress on physiological responses and exercise performance in elite cyclists. J Sci Med Sport 3:186–193. doi: 10.1016/S1440-2440(00)80080-8 Google Scholar
  42. Townshend AD, Worringham CJ, Stewart IB (2010) Spontaneous pacing during overground hill running. Med Sci Sports Exerc 42:160–169CrossRefPubMedGoogle Scholar
  43. Tucker R, Noakes TD (2009) The physiological regulation of pacing strategy during exercise: a critical review. Br J Sports Med 43:e1. doi: 10.1136/bjsm.2009.057562 CrossRefPubMedGoogle Scholar
  44. Tucker R, Rauch L, Harley YX, Noakes TD (2004) Impaired exercise performance in the heat is associated with an anticipatory reduction in skeletal muscle recruitment. Pflugers Arch Eur J Physiol 448:422–430. doi: 10.1007/s00424-004-1267-4 Google Scholar
  45. Tucker R, Marle T, Lambert EV, Noakes TD (2006) The rate of heat storage mediates an anticipatory reduction in exercise intensity during cycling at a fixed rating of perceived exertion. J Physiol 574:905–915. doi: 10.1113/jphysiol.2005.101733 CrossRefPubMedGoogle Scholar
  46. Wilk B, Bar-Or O (1996) Effect of drink flavour and NaCL on voluntary drinking and hydration in boys exercising in the heat. J Appl Physiol 80:1112–1117CrossRefPubMedGoogle Scholar
  47. Wilkinson DM, Carter JM, Richmond VL, Blacker SD, Rayson MP (2008) The effect of cool water ingestion on gastrointestinal pill temperature. Med Sci Sports Exerc 40:523–528. doi: 10.1249/MSS.0b013e31815cc43e CrossRefPubMedGoogle Scholar
  48. Williams C, Nute ML (1983) Some physiological demands of a half-marathon race on recreational runners. Br J Sports Med 17:152–161. doi: 10.1136/bjsm.17.3.152 CrossRefPubMedGoogle Scholar
  49. Wyndham C, Strydom N (1969) The danger of an inadequate water intake during marathon running. S Afr Med J 43:893–896PubMedGoogle Scholar

Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  1. 1.Military Physiology LaboratoryDefence Medical and Environmental Research Institute, DSO National LaboratoriesSingaporeSingapore
  2. 2.School of Sport and Health SciencesUniversity of ExeterExeterUK

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