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The effect of ageing and fitness on thermoregulatory response to high‐intensity exercise
Author(s) -
Best S.,
Caillaud C.,
Thompson M.
Publication year - 2012
Publication title -
scandinavian journal of medicine and science in sports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.575
H-Index - 115
eISSN - 1600-0838
pISSN - 0905-7188
DOI - 10.1111/j.1600-0838.2011.01384.x
Subject(s) - ageing , thermoregulation , medicine , rectal temperature , heat stress , intensity (physics) , aerobic exercise , vo2 max , cycling , physical therapy , heart rate , zoology , blood pressure , biology , history , physics , archaeology , quantum mechanics
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 = 51–63 years) cyclists were matched with two groups of young cyclists (19–35 years); one group matched for training status [young highly trained ( YHT ) participants, n = 7] and another forV ˙ O 2 max[young moderately trained ( YMT ), n = 7]. Each participant exercised at 70%V ˙ O 2 maxin hot (35°C, 40% relative humidity) and thermoneutral (20°C, 40% relative humidity) conditions for 60 min. Final rectal temperature in the thermoneutral and heat ( YHT = 39.13 ± 0.33°C, YMT = 39.11 ± 0.38°C, OHT = 39.11 ± 0.51°C) tests were similar between all three groups. % HR max (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.