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European Journal of Applied Physiology

, Volume 112, Issue 5, pp 1827–1837 | Cite as

Effectiveness of short-term heat acclimation for highly trained athletes

  • Andrew T. GarrettEmail author
  • Rob Creasy
  • Nancy J. Rehrer
  • Mark J. Patterson
  • James D. Cotter
Original Article

Abstract

Effectiveness of short-term acclimation has generally been undertaken using untrained and moderately-trained participants. The purpose of this study was to determine the impact of short-term (5-day) heat acclimation on highly trained athletes. Eight males (mean ± SD age 21.8 ± 2.1 years, mass 75.2 ± 4.6 kg, \( \dot{V}\)O2peak 4.9 ± 0.2 L min−1 and power output 400 ± 27 W) were heat acclimated under controlled hyperthermia (rectal temperature 38.5°C), for 90-min on five consecutive days (T a = 39.5°C, 60% relative humidity). Acclimation was undertaken with dehydration (no fluid-intake) during daily bouts. Participants completed a rowing-specific, heat stress test (HST) 1 day before and after acclimation (T a = 35°C, 60% relative humidity). HST consisted 10-min rowing at 30% peak power output (PPO), 10 min at 60% PPO and 5-min rest before a 2-km performance test, without feedback cues. Participants received 250 mL fluid (4% carbohydrate; osmolality 240–270 mmol kg−1) before the HST. Body mass loss during acclimation bouts was 1.6 ± 0.3 kg (2.1%) on day 1 and 2.3 ± 0.4 kg (3.0%) on day 5. In contrast, resting plasma volume increased by 4.5 ± 4.5% from day 1 to 5 (estimated from [Hb] & Hct). Plasma aldosterone increased at rest (52.6 pg mL−1; p = 0.03) and end-exercise (162.4 pg mL−1; p = 0.00) from day 1 to 5 acclimation. During the HST T re and f c were lowered 0.3°C (p = 0.00) and 14 b min−1 (p = 0.00) after 20-min exercise. The 2-km performance time (6.52.7 min) improved by 4 s (p = 0.00). Meaningful physiological and performance improvements occurred for highly trained athletes using a short-term (5-day) heat acclimation under hyperthermia control, with dehydration.

Keywords

Elite Performance Dehydration Fluid regulation Plasma volume 

Notes

Acknowledgments

Special thanks are given to the participants in this study and the technical expertise provided by Mrs R. McKay and Miss D. Wilson. This work was supported by grants from the Australian Defence Science Technology Organisation and School of Physical Education, University of Otago, New Zealand.

References

  1. Allsopp AJ, Sutherland R, Wood P, Wooton SA (1998) The effect of sodium balance on sweat sodium secretion and plasma aldosterone concentration. Eur J Appl Physiol 78:516–521CrossRefGoogle Scholar
  2. Armstrong LE, Pandolf KB (1988) Physical training, cardiorespiratory physical fitness and exercise-heat tolerance. In: Pandolf KB, Sawka MN, Gonzalez RR (eds) Human performance physiology and environmental medicine at terrestrial extremes. Benchmark Press, Inc., Indianapolis, pp 199–266Google Scholar
  3. Armstrong LE, Maresh CM, Castellani JW, Bergeron MF, Kenefick RW, LaGasse KE, Riebe D (1994) Urinary indices of hydration status. Int J Sport Nutr 4:26–279Google Scholar
  4. Armstrong LE, Herrera Soto JA, Hacker FT, Casa DJ, Kavouras SA, Maresh CM (1998) Urinary indices during dehydration, exercise, and rehydration. Int J Sport Nutr 8:345–355PubMedGoogle Scholar
  5. Bourdon PC, Laureaux C, Patricot MC, Guezennec CY, Foglietti MJ, Villette VM, Friemel F, Haag JC (1987) Variations of a few plasma and urinary components in marathon runners. Ann Biol Clin 45:37–45Google Scholar
  6. Brandenberger G, Candas V, Follenius M, Libert JP, Kahn JM (1986) Vascular fluid shifts and endocrine responses to exercise in the heat. Eur J Appl Physiol 55:123–129CrossRefGoogle Scholar
  7. Brandenberger G, Candas V, Follenius M, Kahn JM (1989) The influence of initial state of hydration on endocrine responses to exercise in the heat. Eur J Appl Physiol 58:674–679CrossRefGoogle Scholar
  8. Bruck K, Olschewski H (1987) Body temperature related factors diminishing the drive to exercise. Can J Physiol Pharmacol 65:1274–1280PubMedCrossRefGoogle Scholar
  9. Buget A, Gati R, Souburan G (1988) Seasonal changes in circadian rhythms of body temperature in humans living in a tropical dry climate. Eur J Appl Physiol 58:334–339CrossRefGoogle Scholar
  10. Buono MJ, Heaney JH, Canine KM (1998) Acclimation to humid heat lowers resting core temperature. Am J Physiol 274:R1295–R1299PubMedGoogle Scholar
  11. Cheung SS, McLellan TM (1998) Heat acclimation, aerobic fitness, and hydration effects on tolerance during uncompensable heat stress. J Appl Physiol 84:1731–1739PubMedGoogle Scholar
  12. Concept2 (2011) World rankings for lightweight 2000 m rowing ergometer performance. In: Concept2 (ed)Google Scholar
  13. Creasy R (2002) Post-exercise sauna bathing does not improve 2000-metre rowing performance. School of Physical Education. University of Otago, Dunedin, p 78Google Scholar
  14. Dill DB, Costill DL (1974) Calculation of percentage changes in volumes of blood, plasma and red cells in dehydration. J Appl Physiol 37(2):247–248PubMedGoogle Scholar
  15. Fan J-L, Cotter JD, Lucas RAI, Thomas K, Wilson L, Ainslie PN (2008) Human cardiorespiratory and cerebrovascular function during severe passive hyperthermia: effects of mild hypohydration. J Appl Physiol 105:433–445PubMedCrossRefGoogle Scholar
  16. Febbraio M, Snow RJ, Hargreaves M, Stathis CG, Martin IK, Carey MF (1994) Muscle metabolism during exercise and heat stress in trained men: effect of acclimation. J Appl Physiol 76:589–597PubMedGoogle Scholar
  17. Fellman N (1992) Hormonal and plasma volume alterations following endurance exercise. Sports Med 13:37–49CrossRefGoogle Scholar
  18. Garrett AT, Goossens NG, Rehrer NJ, Patterson MJ, Cotter JD (2009) Induction and decay of short-term heat acclimation. Eur J Appl Physiol 107:659–671PubMedCrossRefGoogle Scholar
  19. Gass GC, Camp SN, Nadel ER, Gwinn TH, Engel P (1988) Rectal and rectal versus oesphageal temperatures in paraplegic men during prolonged exercise. J Appl Physiol 64:2265–2271PubMedGoogle Scholar
  20. Greenleaf JE, Sargent F II (1965) Voluntary dehydration in man. J Appl Physiol 20:719–724PubMedGoogle Scholar
  21. Harrison MH (1985) Effects of thermal stress and exercise on blood volume in humans. Physiol Rev 65:149–209PubMedGoogle Scholar
  22. Hettinga FJ, De Koning JJ, de Vrijer A, Wust RCI, Daanen HAM, Foster C (2007) The effect of ambient temperature on gross-efficiency in cycling. Eur J Appl Phys 101:465–471CrossRefGoogle Scholar
  23. Hopkins WG, Schabort EJ, Hawley JA (2001) Reliability of power in physical performance tests. Sports Med 31:211–234PubMedCrossRefGoogle Scholar
  24. Houmard JA, Costill DL, Davis JA, Mitchell JB, Pascoe DD, Robergs RA (1990) The influence of exercise intensity on heat acclimation in trained subjects. Med Sci Sports Exerc 22:615–620PubMedCrossRefGoogle Scholar
  25. Hubbard RW, Sandick BL, Matthew WT, Francesconi RP, Sampson JR, Durkot MJ, Maller O, Engell DB (1984) Voluntary dehydration and alliesthesia for water. J Appl Physiol Respir Environ Exerc Physiol 57:868–875Google Scholar
  26. Ikegawa S, Kamijo J, Okazaki K, Masuki S, Okada Y, Nose H (2011) Effects of hypohydration on thermoregulation during exercise before and after 5-day aerobic training in a warm environment in young men. J Appl Physiol 110:972–980PubMedCrossRefGoogle Scholar
  27. Ingham SA, Whyte GP, Nevill AM (2002) Determinants of 2000 m rowing performance in elite rowers. Eur J Appl Phys 88:243–246CrossRefGoogle Scholar
  28. Judelson DA, Maresh CM, Yamamoto LM, Farrell MJ, Armstrong LE, Kraemer WJ, Volek JS, Spiering BA, Casa DJ, Anderson JM (2008) Effect of hydration state on resistance exercise-induced endocrine markers of anabolism, catabolism, and metabolism. J Appl Physiol 105:816–824PubMedCrossRefGoogle Scholar
  29. Kampmann B, Brode P, Schutte M, Griefahn B (2008) Lowering of resting core temperature during acclimation is influenced by exercise stimulus. Eur J Appl Physiol 104:321–327PubMedCrossRefGoogle Scholar
  30. Kenefick RW, Maresh CM, Armstrong LE, Riebe D, Echegaray ME, Castellani JW (2007) Rehydration with fluid of varying tonicities: effects on fluid regulatory hormones and exercise performance in the heat. J Appl Physiol 102:1899–1905PubMedCrossRefGoogle Scholar
  31. Kenny GP, Periard J, Journeay SW, Sigal RJ, Reardon FD (2003) Cutaneous active vasodilation in humans during passive heating postexercise. J Appl Physiol 95:1025–1031PubMedGoogle Scholar
  32. Lorenzo S, Halliwill JR, Sawka MN, Minson CT (2010) Heat acclimation improves exercise performance. J Appl Physiol 109:1140–1147PubMedCrossRefGoogle Scholar
  33. McConell GK, Burge CM, Skinner SL, Hargreaves M (1997) Influence of ingested fluid volume on physiological responses during prolonged exercise. Acta Physiol Scand 160:149–156PubMedCrossRefGoogle Scholar
  34. Morris DJ (1981) The metabolism and mechanism of action of aldosterone. Endocr Rev 2:234–247PubMedCrossRefGoogle Scholar
  35. Moseley PL, Gapen C, Wallen ES, Walter ME, Peterson MW (1994) Thermal stress induces epithelial permeability. Am J Physiol: C425–C434Google Scholar
  36. Nagashima K, Mack GW, Haskell A, Nishiyasu T, Nadel ER (1999) Mechanism for the posture-specific plasma volume increase after a single intense exercise protocol. J Appl Physiol 86:867–873PubMedGoogle Scholar
  37. Nagashima K, Jauchia W, Stavros A, Kavouras A, Mack GW (2001) Increased renal tubular sodium reabsorption during exercise-induced hypervolemia in humans. J Appl Physiol 91:1229–1236PubMedGoogle Scholar
  38. Nielsen B, Savard A, Richter EA, Hargreaves M, Saltin B (1990) Muscle blood flow and muscle metabolism during exercise and heat stress. J Appl Physiol 69:1040–1046PubMedGoogle Scholar
  39. Nielsen B, Hales JRS, Strange S, Christensen JW, Saltin B (1993) Human circulatory and thermoregulatory adaptations with heat acclimation and exercise in a hot, dry environment. J Physiol 460:467–485PubMedGoogle Scholar
  40. Osterberg KL, Pallardy SE, Johnson RJ, Horswill CA (2010) Carbohydrate exerts a mild influence on fluid retention following exercise-induced dehydration. J Appl Physiol 108:245–250PubMedCrossRefGoogle Scholar
  41. Patterson MJ, Stocks JM, Taylor NAS (2004) Sustained and generalised extracellular fluid expansion following heat acclimation. J Physiol 559:327–334PubMedCrossRefGoogle Scholar
  42. Regan JM, Macfarlane DJ, Taylor NAS (1996) An evaluation of the role of skin temperature during heat adaptation. Acta Physiol Scand 158:365–375PubMedCrossRefGoogle Scholar
  43. Sakurada S, Shido O, Sugimoto N, Fujikake K, Nagasaka T (1994) Changes in hypothalamic temperature of rats after daily exposure to heat at a fixed time. Pfluger’s Archiv 429:291–293CrossRefGoogle Scholar
  44. Schabort EJ, Hawley JA, Hopkins WG, Blum H (1999) High reliability of well-trained rowers on a rowing ergometer. J Sports Sci 17:627–632PubMedCrossRefGoogle Scholar
  45. Secher NH (1993) Physiological and biomechanical aspects of rowing: implications for training. Sports Med 15:24–42PubMedCrossRefGoogle Scholar
  46. Senay LC, Mitchell D, Wyndam CH (1976) Acclimatization in a hot, humid environment: body fluid adjustments. J Appl Physiol 40:786–796PubMedGoogle Scholar
  47. Shido O, Sugimoto N, Tanabe M, Sakurada S (1999) Core temperature and sweating onset in humans acclimated to heat at a fixed daily time. Am J Physiol: R1095–R1101Google Scholar
  48. Shvartz E, Saar E, Meyerstein N, Benor D (1973) A comparison of three methods of acclimatization to dry heat. J Appl Physiol 34:214–219PubMedGoogle Scholar
  49. Smith B (2003) Rowing New Zealand. In: Bishop B, Hume P (eds) Guidelines for athlete assessment in New Zealand sport. Sport Science New Zealand, Wellington, New Zealand, pp 1–20Google Scholar
  50. Steinmacker JM (1993) Physiological aspects of training in rowing. Int J Sport Med 14:S3–S10Google Scholar
  51. 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 3:186–193PubMedCrossRefGoogle Scholar
  52. Taylor NAS (2000) Principles and practices of heat adaptation. J Hum Environ Syst 4:11–22CrossRefGoogle Scholar
  53. Taylor NAS, Cotter JD (2006) Heat adaptation: guidelines for the optimisation of human performance. Int Sportmed J 7:1–37Google Scholar
  54. Taylor NAS, Patterson MJ, Regan JM (1995) Heat acclimation procedures: preparation for humid heat exposure. Applied Physiology research laboratory, University of WollongongGoogle Scholar
  55. 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. Pfluger’s Archiv 448:422–430Google Scholar
  56. Turk J, Worsley DE (1974) A technique for the rapid acclimatisation to heat for the army. Army Personnel Research Establishment. Ministry of Defence, Farnborough, pp 1–15Google Scholar
  57. Weller AS, Harrison MH (2001) Influence of heat acclimation on physiological strain during exercise-heat stress in men wearing clothing of limited water vapour permeability. J Physiol 531:51PCrossRefGoogle Scholar
  58. Willoughby DS, Priest JW, Nelson M (2002) Expression of the stress proteins, Ubiquitin, Heat Shock Protein 72, and Myofibrillar Protein Content After 12 weeks of Leg Cycling in Persons With Spinal Cord Injury. Arch Phys Med Rehabil 83:649–654PubMedCrossRefGoogle Scholar

Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Andrew T. Garrett
    • 1
    Email author
  • Rob Creasy
    • 1
  • Nancy J. Rehrer
    • 1
  • Mark J. Patterson
    • 2
  • James D. Cotter
    • 1
  1. 1.School of Physical EducationUniversity of OtagoDunedinNew Zealand
  2. 2.Defence Science Technology Organisation (DSTO)MelbourneAustralia

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