The energy requirements of work.
D000375:Aging; D001331:Automation; D002151:Calorimetry; D002980:Climate; D006233:Persons with Disabilities; D004734:Energy Metabolism; D006801:Humans; D009747:Nutritional Physiological Phenomena; D009765:Obesity; D009787:Occupational Medicine; D010101:Oxygen Consumption; D011998:Recreation; D014937:Work