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Torso heating of divers in cold water
Paul O'Connor1, Dale Hyde, John Clarke
1Operations Research Dept, Naval Postgraduate School, Monterey, CA 93943, USA. poc73@hotmail.com
Introduction:
Cold water immersion could compromise both the effectiveness and safety of a diver. This paper reports an evaluation of the utility of providing external heating to divers in cold water.
Methods:
Seven U.S. Navy divers wearing semidry suits were submerged in 7.2 degrees C water for 2 h. In the heated condition, a total of 35 W was delivered to each of four heating pads (total area 2477 cm2) placed on the torso of the divers. In the unheated condition, the participants received no external heating.
Results:
The participants believed they were more comfortable in the heated, than the unheated condition. However, objective data did not support this perception. In fact, heating the torso had a significantly detrimental effect on the body's thermoregulatory ability, and lacked a positive effect on manual dexterity. Cognitive test performance was not affected by the exposure.
Discussion:
Heating the torso did not have a positive effect on diver performance. Moreover, heating the torso of a diver may actually increase susceptibility to hypothermia.
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