Control of heat-induced cutaneous vasodilatation in relation to age

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Abstract

Well matched unacclimatised older (age 55-68, 4 women, 2 men) and younger (age 19-30, 4 women, 2 men) subjects performed 75 min cycle exercise (∼40% {Mathematical expression}) in a hot environment (37°C, 60% rh). Rectal temperature (Tre), mean skin temperature (-Tsk), arm blood flow (ABF, strain gauge plethysmography), and cardiac output (Q, CO2 rebreathing) were measured to examine age-related differences in heat-induced vasodilatation. Tre and -Tsk rose to the same extent in each group during the exposure. There was no significant intergroup difference in sweat rate (older: 332±43 ml · m-2 · h-1, younger: 435±49 ml · m-2 · h-1; mean±SEM). However, the older subjects responded to exercise in the heat with a lower ABF response which could be attributed to a lower {Mathematical expression} for the same exercise intensity. The slope of the ABF-Tre relationship was attenuated in the older subjects (9.3±1.3 vs 17.9±3.3 ml · 100 ml-1 · min-1 · °C-1, p <0.05), but the Tre threshold for vasodilatation was about 37.0°C for both groups. These results suggest an altered control of skin vasodilatation during exercise in the heat in older individuals. This attenuated ABF response appears to be unrelated to {Mathematical expression}, and may reflect an age-related change in thermoregulatory cardiovascular function.

Original languageEnglish (US)
Pages (from-to)120-125
Number of pages6
JournalEuropean Journal of Applied Physiology and Occupational Physiology
Volume57
Issue number1
DOIs
StatePublished - Jan 1988

All Science Journal Classification (ASJC) codes

  • Physiology
  • Public Health, Environmental and Occupational Health

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