Measurement of Work Metabolism. Use of Cardiorespiratory Parameters for Estimating Metabolic Heat Production in Hot Environments,

摘要

Nine healthy men of normal weight between the ages of 21and 56performed several tasks in three hot but relatively dry environments. The tasks,walking on a treadmill,stepping,arm lifting, shoveling and isometric handgrip,were performed at two intensities in each environment until a steady-state rectal temperature was observed. Several equations were developed using heart rate,weight,and minute ventilation to predict metabolic heat generated during work. Eight older men (ages 39to 53) who were overweight were selected for walking on the treadmill under similar conditions,including a neutral environment. It is found that heat produced during work in hot environments can be estimated from measurement of weight,heart rate,and minute ventilation,but the equations developed for normal individuals should not be used to estimate the heat production of overweight men.