Table 1 Accelerometer-determined physical activity and sedentary behavior variable definitions
Variable | Definitions |
|---|---|
Physical activity monitor (PAM) compliance indicator* | |
Accelerometer wear time | 1,440 minutes minus non-wear time [12]. |
Volume indicators* | |
Steps | |
Uncensored steps/day | Total raw steps accumulated over 1,440 minutes [19]. |
Censored steps/day | Total steps accumulated over 1,440 minutes after censoring steps accumulated at intensities < 500 activity counts/minute [19]. |
Activity counts | |
Activity counts/day | Total activity counts accumulated over 1,440 minutes [16]. |
Rate indicators* | |
Steps | |
Uncensored steps/minute | Total raw steps accumulated over 1,440 minutes, divided by accelerometer wear time [16]. |
Censored steps/minute | Total steps accumulated over 1,440 minutes after censoring steps taken at intensities < 500 activity counts/minute, divided by accelerometer wear time [16]. |
Peak 1-minute cadence | Steps/minute recorded for the highest single minute in a day [17]. |
Peak 30-minute cadence | Average steps/minute recorded for the 30 highest, but not necessarily consecutive, minutes in a day [17]. |
Activity counts | |
Activity counts/minute | Total activity counts accumulated over 1,440 minutes, divided by accelerometer wear time [12]. |
Time indicators* | |
Cadence | |
Non-movement | Total minutes at 0 steps/minute during valid wear time [18]. |
Incidental movement | Total minutes at 1–19 steps/minute [18]. |
Sporadic movement | Total minutes at 20–39 steps/minute [18]. |
Purposeful steps | Total minutes at 40–59 steps/minute [18]. |
Slow walking | Total minutes at 60–79 steps/minute [18]. |
Medium walking | Total minutes at 80–99 steps/minute [18]. |
Brisk walking | Total minutes at 100–119 steps/minute [18]. |
Faster locomotion | Total minutes ≥ 120 steps/minute [18]. |
Any movement | Total minutes > 0 steps/minute [18].** |
Non-incidental movement | Total minutes > 19 steps/minute [18].** |
Activity intensity | |
Sedentary time | Total minutes < 100 activity counts/minute [15]. |
Low intensity | Total minutes at 100–499 activity counts/minute [16]. |
Light intensity | Total minutes at 500–2,019 activity counts/minute [19]. |
Lifestyle intensity | Total minutes at 760–2,019 activity counts/minute [13]. |
Moderate intensity | Total minutes at 2,020-5,998 activity counts/minute [12]. |
Vigorous intensity | Total minutes ≥ 5,999 activity counts/minute [12]. |
Moderate-to-vigorous intensity | Total minutes ≥ 2,020 activity counts/minute [12]. |
Moderate-to-vigorous intensity in 10 minute bouts | Total minutes ≥ 2,020 activity counts/minute accumulated in modified 10 minute bouts [12].† |
Breaks in sedentary time* | |
Transitions/day | Number of occurrences where activity counts rose from < 100 activity counts in one minute to ≥ 100 activity counts in the subsequent minute [14]. |