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IMEN 368 인간공학 II
 physical demand of work
 Light – smaller than 2.5 kcal/min – oxidative metabolism
 Moderate – 2.5 to 5.0 kcal/min – oxidative metabolism
 Heavy – 5.0 to 7.5 kcal/min – only physically fit workers through oxidative metabolism,
oxygen deficit incurred at the start of work cannot be repaid until the end of the work
 very heavy ( 7.5 to 10 kcal/min), extremely heavy (greater than 10 kcal/min) – even
physically fit workers cannot reach a steady state condition during the period of work –
oxygen deficit and lactic acid accumulation
 Measurement of Workload
 Physiological and subjective methods
 energy expenditure rate is linearly related to the oxygen consumption rate and to HR
 Oxygen Consumption
 Energy expenditure rate (kcal/min) = 4.8 kcal/liter * oxygen consumption rate (l/min)
 Oxygen consumption = aerobic metabolism during work + anaerobic metabolism during
recovery
 static work not well reflected in O2 measure
 Heart Rate
 indirect measure of energy expenditure, not as reliable as O2 consumption rate
 resting HR – 60 to 80 beats/min
 increase from the resting to the steady state is a measure of physical workload
 max HR = 206 – (0.62*age)
 max HR = 220 – age
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