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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Fujii, Naoto Tsuji, Bun Honda, Yasushi Kondo, Narihiko Nishiyasu, Takeshi |
| Description | Author Affiliation: Fujii N ( Institute of Health and Sport Sciences, University of Tsukuba, Tsukuba, Japan); Tsuji B ( Institute of Health and Sport Sciences, University of Tsukuba, Tsukuba, Japan); Honda Y ( Institute of Health and Sport Sciences, University of Tsukuba, Tsukuba, Japan); Kondo N ( Faculty of Human Development, Kobe University, Kobe, Japan.); Nishiyasu T ( Institute of Health and Sport Sciences, University of Tsukuba, Tsukuba, Japan) |
| Abstract | Hyperthermia induces hyperventilation and cerebral hypoperfusion in resting humans. We tested the hypothesis that short-term exercise-heat acclimation would alleviate those effects. Twenty healthy male subjects were divided into two groups that performed exercise training in the heat (TR-HEAT, n = 10) or cold (TR-COLD, n = 10). Before and after the training, the subjects in both groups participated in passive-heat tests at rest. Training was performed at 37°C (TR-HEAT) or 10°C (TR-COLD) and entailed four 20-min bouts of cycling at 50% peak oxygen uptake separated by 10-min recoveries daily for 6 consecutive days. After TR-HEAT, esophageal temperature was lowered when measured before and during passive heating, as was the esophageal temperature threshold for cutaneous active vasodilation, whereas plasma volume was increased (all P < 0.05). These traditional indices of successful heat acclimation were not all induced by TR-COLD (all P > 0.05). TR-HEAT had no significant effect on passive heating-induced increases in minute ventilation, even when evaluated as the esophageal temperature threshold for increases in minute ventilation and the slope relating minute ventilation to esophageal temperature (all P > 0.05). By contrast, TR-HEAT attenuated the passive heating-induced reduction in the cerebral vascular conductance index (middle cerebral artery mean blood velocity/mean arterial pressure) (all P < 0.05). TR-COLD did not attenuate the increase in minute ventilation or the decrease in the cerebral vascular conductance index observed during passive heating (all P > 0.05). These data suggest that in resting heated humans, short-term heat acclimation achieved through moderate-intensity exercise training (i.e., 50% peak oxygen uptake) in the heat does not influence hyperthermia-induced hyperventilation, but it does potentially attenuate cerebral hypoperfusion. |
| File Format | HTM / HTML |
| ISSN | 87507587 |
| e-ISSN | 15221601 |
| Journal | Journal of Applied Physiology |
| Issue Number | 5 |
| Volume Number | 119 |
| Language | English |
| Publisher | American Physiological Society |
| Publisher Date | 2015-09-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Discipline Physiology Acclimatization Physiology Cerebrovascular Circulation Arterial Pressure Body Temperature Regulation Cold Temperature Fever Physiopathology Heating Homeostasis Hot Temperature Hyperventilation Plasma Volume Sweating Research Support, Non-u.s. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Physiology Physiology (medical) Sports Science |
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