Cold-induced vasodilation during continuous exercise in the extreme cold air (-30.6 °c)
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KeywordsSkin Temperature Body Core Temperature Healthy Male Subject Intermittent Exercise Cold Water Immersion
Cold induced vasodilation (CIVD) in previous studies was mostly evoked by cold water immersion at 0, 5, and 8 °C of the upper or lower extremities without performing physical work . A limited number of investigations incorporated intermittent exercises during cold air exposure . Literature has documented that the CIVD occurrence depended on the body core temperature , . It was observed that CIVD in cold water immersion was highly variable across the fingers and was not a generalizable response across fingers or toes . However, the number of studies on cold air induced vasodilation in the extremely cold is limited. The objective of this study was to investigate individual variations of finger CIVD in relation to the core and mean skin temperatures during continuous exercise in the extreme cold air (-30.6 °C).
CIVD in the little finger occurred when the subjects' rectal temperatures (Tre) were relatively stable in the range of 37.1 - 38.1 °C and the Tsk in the range of 32.0 - 25.3 °C. Within these ranges, the finger CIVD periodical responses were not dependent on the Tre and Tsk changes. The onset time, Tmin, Tmax and Tfinger_mean, amplitude (Tmax - Tmin), frequency (number of waves) of the CIVD were 14.6 (3.5) min, 3.8 (3.4) °C, 16.5 (3.6) °C, 7.9 (1.4) °C, 12.7 (4.4) °C, 7.5 (4.7) respectively.
The finger CIVD appeared in all four subjects. However, the onset time, minimum, maximum and mean finger temperatures, amplitude, frequency of the CIVD varied among the four subjects. The finger CIVD occurred when the mean finger temperatures of the four subjects were below 10 °C, thus it seems to be related to the local cooling of the extremities during continuous and stable exercise at high metabolic rate in the extremely cold environment. The CIVD in toes was not as clear as in the fingers, which might be attributed to the continuous walking.
The finger CIVD varies among the subjects. Its occurrence is not dependent on Tre and Tsk changes within the Tre and Tsk ranges (37.1 - 38.1 °C and 32.0 - 25.3 °C), but it is associated with the local cooling of the extremities during continuous 90 min walking at 4 MET in the extreme cold air (-30.6 °C).
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