Thermoregulatory responses of junior lifesavers wearing protective clothing

Sinclair, Wade H., Crowe, Melissa J., Spinks, Warwick L., and Leicht, Anthony S. (2008) Thermoregulatory responses of junior lifesavers wearing protective clothing. Journal of Science and Medicine in Sport, 11 (6). pp. 542-548.

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This study investigated the influence of protective clothing worn to prevent marine stinger envenomation on the thermoregulatory responses of pre-pubescent surf lifesavers exercising in situ under hot and humid conditions (27 °C, 78% relative humidity). Participants performed beach and water activities typically associated with junior surf lifesaving competition in a randomised cross-over design on two separate occasions 7 days apart: one wearing a full-length Lycra stinger suit (S) and one wearing normal swimwear (SW). Skin (TSK) and core (TC) body temperatures, skin blood flow (SKBF), heart rate (HR), body mass, thermal comfort and perceived effort were assessed pre-, mid- (following beach activities) and post-exercise (following water activities). Sweat rates were compared between S and SW. TC was greater following beach activities for S (37.78 °C ± 0.06) compared to SW (37.60 °C ± 0.07; p < 0.05) and male participants experienced greater TC (37.97 °C ± 0.09) than their female counterparts (37.71 °C ± 0.07 °C). TSK following both the beach and water activities were lower than pre-exercise (p < 0.05). SKBF was significantly increased for calf across time (p < 0.01). Male participants experienced a higher HR for S compared to female participants (p < 0.01) while the opposite applied to SW (p < 0.01). There were no gender or between-condition differences for sweat rate or perceived effort. There was evidence of heat storage while stinger suits were worn during beach activities in the absence of any differences in exercise intensity or sweat rate. The results of the present study suggest that the stinger suits should be limited to water-based activities.

Item ID: 6675
Item Type: Article (Research - C1)
ISSN: 1440-2440
Keywords: child; heat; heat stress disorders; exercise; body temperature regulation; protective clothing
Date Deposited: 02 Mar 2010 05:57
FoR Codes: 11 MEDICAL AND HEALTH SCIENCES > 1106 Human Movement and Sports Science > 110602 Exercise Physiology @ 50%
11 MEDICAL AND HEALTH SCIENCES > 1106 Human Movement and Sports Science > 110699 Human Movement and Sports Science not elsewhere classified @ 50%
SEO Codes: 92 HEALTH > 9205 Specific Population Health (excl. Indigenous Health) > 920501 Child Health @ 50%
92 HEALTH > 9204 Public Health (excl. Specific Population Health) > 920405 Environmental Health @ 50%
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