A person weighing 70 kg and expending energy at a rate of 42 kJ min⁻¹ would be exercising at approximately:

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A MET (Metabolic Equivalent of Task) is a unit that estimates the energy expenditure of physical activities, defined as the ratio of the metabolic rate during a specific physical activity to a reference metabolic rate, set by convention to 3.5 ml O2 per kg body weight per minute. To convert the energy expenditure from kJ/min to METs, we first convert kJ to kcal (since 1 MET = 1 kcal/kg/hr), knowing that 1 kJ = 0.239 kcal. The person is expending 42 kJ/min, which equals 42 * 0.239 = 10.038 kcal/min. To find METs, we convert kcal/min to kcal/hr (10.038 kcal/min * 60 min/hr = 602.28 kcal/hr), and then divide by the person's weight in kg (602.28 kcal/hr / 70 kg = 8.61 kcal/kg/hr). Since 1 MET = 1 kcal/kg/hr, the person is exercising at approximately 8 METs.

A Person Weighing 70 Kg and Expending Energy at a Rate