Slie ceiirgy cost of a nun-oer of tactical tasks was measured for soldiers during tactically controlled rather than experimentally controlled tasks. TIh tipper q range of energy expenditure rates was 400 to 450 kcal per hour during thew-tactical inttioeuvres; incipient physical or heat exhaustion was associated with the fe w muchU L4 higher values. The realism of the tactical situation, and an estimate of the contribution made by the heat load andi wearing of the gas mask to the energy costs f

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... measured is presented. The hypothesi" is presented that the upper ranve of energy expenditure rates for prolonged periods is independent of terrain when men area allowed to work at their own pace, but dt-pends on the total weight citrrie(l. The relationship between ventilation volmue and energy expenditure in this study is . compared with data prot'ited by L iddell aii(I supports thi argument thai calculation of energy e::penditure can be reliablY muale using a single formula to convert ventilation volume per sr. ptrticularly within the practical accuracy of fiohl invac ,Tements. §