| Title |
Effects of hyperthermia on the metabolic responses to repeated high-intensity exercise
|
|---|---|
| Published in |
European Journal of Applied Physiology, July 2004
|
| DOI | 10.1007/s00421-004-1191-5 |
| Pubmed ID | |
| Authors |
D. M. Linnane, R. M. Bracken, S. Brooks, V. M. Cox, D. Ball |
| 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) degrees 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 degrees C for 16.0 (3.2) min] prior to entering an environmental chamber [44.2 (0.8) degrees 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) degrees C for 29.0 (1.9) min]. Subjects' core temperature prior to exercise was 38.1 (0.3) degrees C in the hot trial and 37.1 (0.3) degrees 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) micromol l(-1 )hot vs 70 (26) micromol l(-1) control ( P<0.01)], immediately and at 2 min post-SpII [231 (76) micromol l(-1) hot vs 147 (72) micromol 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 degrees 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. |
X Demographics
The data shown below were collected from the profiles of 2 X users who shared this research output. Click here to find out more about how the information was compiled.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| Spain | 1 | 50% |
| Nepal | 1 | 50% |
Demographic breakdown
| Type | Count | As % |
|---|---|---|
| Members of the public | 2 | 100% |
Mendeley readers
The data shown below were compiled from readership statistics for 135 Mendeley readers of this research output. Click here to see the associated Mendeley record.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| Brazil | 2 | 1% |
| Netherlands | 1 | <1% |
| India | 1 | <1% |
| United Kingdom | 1 | <1% |
| United States | 1 | <1% |
| Unknown | 129 | 96% |
Demographic breakdown
| Readers by professional status | Count | As % |
|---|---|---|
| Student > Bachelor | 38 | 28% |
| Student > Ph. D. Student | 16 | 12% |
| Student > Master | 13 | 10% |
| Researcher | 10 | 7% |
| Student > Doctoral Student | 6 | 4% |
| Other | 21 | 16% |
| Unknown | 31 | 23% |
| Readers by discipline | Count | As % |
|---|---|---|
| Sports and Recreations | 71 | 53% |
| Medicine and Dentistry | 8 | 6% |
| Agricultural and Biological Sciences | 7 | 5% |
| Biochemistry, Genetics and Molecular Biology | 6 | 4% |
| Nursing and Health Professions | 2 | 1% |
| Other | 8 | 6% |
| Unknown | 33 | 24% |
Attention Score in Context
This research output has an Altmetric Attention Score of 2. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 17 July 2013.
All research outputs
#16,580,157
of 25,374,647 outputs
Outputs from European Journal of Applied Physiology
#3,198
of 4,345 outputs
Outputs of similar age
#53,551
of 59,690 outputs
Outputs of similar age from European Journal of Applied Physiology
#11
of 20 outputs
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