The impact of different cooling modalities on the physiological responses in firefighters during strenuous work performed in high environmental temperatures |
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Authors: | David Barr Thomas Reilly Warren Gregson |
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Institution: | (1) Research Institute for Sports and Exercise Sciences, Liverpool John Moores University, Tom Reilly Building, Byrom Street Campus, Liverpool, L3 3AF, UK |
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Abstract: | This study investigated the impact of ice vests and hand/forearm immersion on accelerating the physiological recovery between
two bouts of strenuous exercise in the heat mean (SD), 49.1(1.3)°C, RH 12 (1)]. On four occasions, eight firefighters completed
two 20-min bouts of treadmill walking (5 km h, 7.5% gradient) while wearing standard firefighter protective clothing. Each
bout was separated by a 15-min recovery period, during which one of four conditions were administered: ice vest (VEST), hand/forearm
immersion (W), ice vest combined with hand/forearm immersion (VEST + W) and control (CON). Core temperature was significantly
lower at the end of the recovery period in the VEST + W (37.97 ± 0.23°C) and W (37.96 ± 0.19°C) compared with the VEST (38.21 ± 0.12°C)
and CON (38.29 ± 0.25°C) conditions and remained consistently lower throughout the second bout of exercise. Heart rate responses
during the recovery period and bout 2 were similar between the VEST + W and W conditions which were significantly lower compared
with the VEST and CON which did not differ from each other. Mean skin temperature was significantly lower at the start of
bout 2 in the cooling conditions compared with CON; these differences reduced as exercise progressed. These findings demonstrate
that hand/forearm immersion (~19°C) is more effective than ice vests in reducing the physiological strain when firefighters
re-enter structural fires after short rest periods. Combining ice vests with hand/forearm immersion provides no additional
benefit. |
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