The aim of the present study was to evaluate the local cold tolerance of older Korean female divers, haenyeo (N = 22) in terms of cold
acclimatization and ageing. As control groups, older non-diving females (N = 25) and young females from a rural area (N = 15) and an urban area (N = 51) participated in this study. To evaluate local cold tolerance, finger cold-induced vasodilation (CIVD) during finger immersion
of 4 °C water was examined. As a result, older haenyeos showed greater minimum finger temperature and recovery finger temperature than
older non-diving females (P < 0.05), but similar responses in onset time, peak time, maximum finger temperature, frequency of CIVD, heart
rate, blood pressure, and thermal and pain sensations as those of older non-diving females. Another novel finding was that young urban
females showed more vulnerable responses to local cold in CIVD variables and subjective sensations when compared to older females,
whereas young rural females had the most excellent cold tolerance in terms of maximum temperature and frequency of CIVD among the four groups (P < 0.05). The present results imply that older haenyeos still retain cold acclimatized features on the periphery even though they
changed their cotton diving suits to wet suits in the early 1980s. However, cardiovascular responses and subjective sensations to cold
reflect aging effects. In addition, we suggest that young people who have been adapted to highly insulated clothing and indoor heating
systems in winter should be distinguished from young people who were exposed to less modern conveniences when compared to the
aged in terms of cold tolerance. |
