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Table 1 Operational definition of the activity parameters

From: Home-based system for physical activity monitoring in patients with multiple sclerosis (Pilot study)

Parameter Operational definition
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