Men wear cooling garments to reduce external heat load and to remove metabolic heat. The effects of cooling can be seen in physiological measurements made with and without cooling, and the question is: what are the meaningful measurements to make? The following measurements are described and illustrated with experimental data: tolerance times to a physiological or performance end point; heart rate; sweat rate; temperatures in three body compartments; and heat flows to the cooling garment. All of these measurements are useful in various ways, particularly those dealing with heat storage and rates of heat removal.
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