Physical activity level

The physical activity level (PAL) is a way to express a person’s daily physical activity as a number, and is used to estimate a person’s total energy expenditure. In combination with the basal metabolic rate, it can be used to compute the amount of food energy a person needs to consume in order to maintain a particular lifestyle.

The physical activity level are defined for a non-pregnant, non-lactating adult as that person’s total energy expenditure (TEE) in a 24-hour period, divided by his or her basal metabolic rate (BMR): The physical activity level can also be estimated based on a list of the (physical) activities a person performs from day to day. Each activity is connected to a number, the physical activity ratio. The physical activity level is then the time-weighted average of the physical activity ratios.

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