Table 1 Operational definition of the activity parameters

Number of steps

Average number of steps per time interval (day, week…)

Maximum walking speed

Maximum walking speed over a time interval (day, week…)

Mean walking speed

Average walking speed over a time interval (day, week…)

Physical activity intensity (MET level)

Percentage over a time interval

(MET = EE / BMR) ; EE: energy expenditure

BMR: Basal metabolic rate