Skip to main content

Table 1 Accelerometer physical activity/inactivity indicator variables

From: Accelerometer profiles of physical activity and inactivity in normal weight, overweight, and obese U.S. men and women

Accelerometer variable Defined
Volume indicators*
Activity counts/day Total activity counts accumulated over 1,440 minutes
Uncensored steps/day Total raw steps accumulated over 1,440 minutes
Censored steps/day Total steps accumulated over 1,440 minutes after censoring out those steps taken at an intensity < 500 activity counts/minute
Rate indicators*
Activity counts/minute Total activity counts accumulated over 1,440 minutes, divided by time worn
Uncensored steps/minute Total raw steps accumulated over 1,440 minutes (24 hours or one day), divided by time worn
Censored steps/minute Total steps accumulated over 1,440 minutes after censoring out those steps taken at an intensity < 500 activity counts/minute, divided by time worn
Time indicators (minutes)*
Non-wear time 1,440 minutes minus wear time
Time in sedentary intensity Total time < 100 activity counts/minute
Time in low intensity Total time 100-499 activity counts/minute
Time in light intensity Total time 500-2,019 activity counts/minute
Time in moderate intensity Total time 2,020-5,999 activity counts/minute
Time in vigorous intensity Total time > 5,999 activity counts/minute
Achievement of public health guideline indicator
Y/N achievement of public health guidelines Percent achieving ≥ 30 minutes of at least moderate intensity in modified 10-minute bouts** on at least 5 of 7 days
Break in sedentary time indicator*
Transitions/day Total occurrences of when activity counts rose from < 100 activity/counts in one minute to ≥ 100 activity counts in the subsequent minute
Step-defined activity levels (%)
Basal activity < 2,500 censored steps/day
Limited activity 2,500 to 4,999 steps/day
Low active 5,000-7,499 steps/day
Somewhat active 7,500-9,999 steps/day
Active 10,000-12,499 steps/day
Highly active ≥ 12,500 steps/day
  1. *averaged over number of days worn
  2. **10 or more consecutive minutes above the moderate intensity activity count threshold, with allowance for interruptions of 1 or 2 minutes below threshold. A bout was terminated by 3 minutes below threshold.