Journal
SCANDINAVIAN JOURNAL OF MEDICINE & SCIENCE IN SPORTS
Volume 22, Issue 4, Pages E29-E37Publisher
WILEY-BLACKWELL
DOI: 10.1111/j.1600-0838.2011.01384.x
Keywords
aging; core temperature; exercise; sweating; skin blood flow
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Funding
- Faculty of Health Sciences, The University of Sydney
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There are conflicting reports as to whether ageing causes a decreased thermoregulatory response, or if observed differences in previous studies are related to maximal aerobic capacity or training status. This study hypothesized that thermoregulatory response to severe exercise-heat stress is maintained with ageing when both young and older subjects are well trained. Seven older highly trained (OHT?=?5163 years) cyclists were matched with two groups of young cyclists (1935 years); one group matched for training status [young highly trained (YHT) participants, n?=?7] and another for V ? O 2 max [young moderately trained (YMT), n?=?7]. Each participant exercised at 70% V ? O 2 max in hot (35 degrees C, 40% relative humidity) and thermoneutral (20 degrees C, 40% relative humidity) conditions for 60?min. Final rectal temperature in the thermoneutral and heat (YHT?=?39.13?+/-?0.33 degrees C, YMT?=?39.11?+/-?0.38 degrees C, OHT?=?39.11?+/-?0.51 degrees C) tests were similar between all three groups. %HRmax (heat test: YHT?=?92.5?+/-?6.0%, YMT?=?91.6?+/-?4.4%, OHT?=?88.6?+/-?5.1%), skin temperature, and cutaneous vascular conductance during cycling in both environments were similar between groups. Lower sweat loss and evaporative heat loss in the heat test in the OHT and YMT groups when compared with the YHT group reflected lower metabolic heat production. The findings of the present study suggest that thermoregulatory response is maintained with age among highly trained subjects.
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