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- Title
The effects of face cooling during hyperthermic exercise in man: evidence for an integrated thermal, neuroendocrine and behavioural response.
- Authors
Mündel, Toby; Bunn, Sabrina J.; Hooper, Paula L.; Jones, David A.
- Abstract
The present study investigated whether face cooling reduced both the perceived exertion (RPE) and prolactin (PRL) release during hyperthermic exercise. Ten, non-heat-acclimated males (23 ± 2 years; maximal oxygen consumption, 56 ± 7 ml kg–1 min–1[mean ±s.d.]) exercised for 40 min on a cycle ergometer at 65% of their peak aerobic power, at an ambient temperature of 33°C (27% relative humidity) with (FC) and without face cooling as a control (CON). With FC, forehead temperature was maintained ∼6°C lower than CON, while other skin sites were similar or slightly warmer in the FC condition. Rectal temperature increased by ∼1.5°C with the same time course in both conditions. A relative bradycardia was observed during FC, with heart rate approximately 5 beats min–1 lower than CON ( P < 0.05). Mean plasma lactate was lower during FC (FC, 5.0 ± 0.3 mmol l–1; CON, 5.9 ± 0.3 mmol l–1; P < 0.05) but no differences were observed for plasma glucose, which remained constant during exercise. Levels of PRL were maintained at 175 ± 17 mIU l–1 during exercise for FC, while values for CON increased to a peak of 373 ± 22 mIU l–1 so that towards the end of the exercise, for the same rectal temperature, PRL was significantly lower in the FC condition ( P < 0.05). Global and breathing RPE were reduced but only towards the end of the 40 min of exercise during FC, whilst subjective thermal comfort was significantly lower during FC ( P < 0.05). We confirm the substantial effect that FC has on the secretion of PRL during hyperthermic exercise but show that it makes a relatively small contribution to the perception of effort when compared to the effect of a cool total skin area as occurs with exercise in a thermoneutral environment.
- Subjects
EXERCISE physiology; BODY temperature; PROLACTIN; DYNAMOMETER; AEROBIC exercises; BRADYCARDIA; HEART beat; RESPIRATION
- Publication
Experimental Physiology, 2007, Vol 92, Issue 1, p187
- ISSN
0958-0670
- Publication type
Article
- DOI
10.1113/expphysiol.2006.034934