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European Journal of Applied Physiology

, Volume 93, Issue 1–2, pp 159–166 | Cite as

Effects of hyperthermia on the metabolic responses to repeated high-intensity exercise

  • D. M. Linnane
  • R. M. Bracken
  • S. Brooks
  • V. M. Cox
  • D. Ball
Original Article

Abstract

In this study, we investigated the metabolic and performance responses to hyperthermia during high-intensity exercise. Seven males completed two 30-s cycle sprints (SpI and SpII) at an environmental temperature of 20.6 (0.3) °C [mean (SD)] with 4 min recovery between sprints. A hot or control treatment preceded the sprint exercise. For the hot trial, subjects were immersed up to the neck in hot water [43°C for 16.0 (3.2) min] prior to entering an environmental chamber [44.2 (0.8)°C for 30.7 (7.1) min]. For the control trial, subjects were seated in an empty bath (15 min) and thereafter in a normal environment [20.2 (0.6)°C for 29.0 (1.9) min]. Subjects’ core temperature prior to exercise was 38.1 (0.3)°C in the hot trial and 37.1 (0.3)°C in the control trial. Mean power output (MPO) was significantly higher in the hot condition for SpI [683 (130) W hot vs 646 (119) W control (P<0.025)]. Peak power output (PPO) tended to be higher in the hot trial compared with the control trial for SpI [1057 (260) W hot vs 990 (245) W control (P=0.03, NS)]. These differences in power output were a consequence of a faster pedal cadence in the hot trial (P<0.025). There were no differences in sprint performance in SpII in the hot trial compared to the control trial; however, MPO was significantly reduced from SpI to SpII in the hot condition but not in the control condition (P<0.025). Plasma ammonia was higher in the hot trial at 2 min post-SpI [169 (65) μmol l-1 hot vs 70 (26) μmol l-1 control (P<0.01)], immediately and at 2 min post-SpII [231 (76) μmol l-1 hot vs 147 (72) μmol l-1 control (P<0.01)]. Blood lactate was higher in the hot trial compared with the control trial at 5 min post-SpII (P<0.025). The results of this study suggest that an elevation in core body temperature by 1°C can improve performance during an initial bout of high-intensity cycle exercise but has no further beneficial effect on subsequent power production following a 4-min recovery period.

Keywords

Blood lactate Body temperature Maximal exercise Plasma ammonia 

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Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  • D. M. Linnane
    • 1
  • R. M. Bracken
    • 1
  • S. Brooks
    • 1
  • V. M. Cox
    • 1
  • D. Ball
    • 2
  1. 1.Physiology and Sport Science, School of Science and the EnvironmentCoventry UniversityCoventryUK
  2. 2.School of Medical Sciences, College of Life Sciences and MedicineUniversity of AberdeenAberdeenUK

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