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Table 2 Description of the accelerometers/inclinometers reported in articles included in the systematic review

From: Validity of objective methods for measuring sedentary behaviour in older adults: a systematic review

Brand and model Studies in which assessed Placement of monitor in reviewed studies Type of monitor Output available
ActiGraph GT3X+ (ActiGraph LLC, Fort Walton Beach, FL, USA). [17, 25,26,27,28,29,30,31, 33, 34] Hip, waist, thigh, ankle, wrist Triaxis accelerometer using piezoresistive and capacitive technology Activity counts from acceleration signals in vector axis only or in vertical magnitude, a composite measure using the three axes; raw-mode output allows for post-data collection filtering [63]. Filtering and choice of epoch time is done after data collection. Offers a low-frequency extension (LFE) filter, designed to better capture low-intensity activities like sedentary behaviour than the normal filter.
ActiGraph GT3X (ActiGraph LLC, Fort Walton Beach, FL, USA). [32] Hip, waist, thigh, ankle, wrist Triaxis accelerometer using piezoresistive and capacitive technology Activity counts from acceleration signals in vector axis only or in vertical magnitude, a composite measure using the three axes. Filtering and choice of epoch time must be set before data collection. Offers a low-frequency extension (LFE) filter, designed to better capture low-intensity activities like sedentary behaviour than the normal filter.
ActiGraph 7164 (ActiGraph LLC, Fort Walton Beach, FL, USA). [35, 36] Hip Uniaxis accelerometer using piezoelectric technology Activity counts that are filtered, digitized and full-wave rectified from acceleration signals in vector axis [63]. Filtering and choice of epoch time must be set before data collection.
Actical (Mini Mitter Respironics, Inc., Bend, OR, USA) [37] Waist ‘Omni-directional’ accelerometer using piezoresistive and capacitive technology; most sensitive to motion in one plane Activity counts that are filtered and digitized from acceleration signals
activPAL (PAL Technologies Ltd., Glasgow, Scotland) [38] Thigh Uniaxis accelerometer using capacitive technology Classifies activities as sitting/lying, standing or walking
activPAL3 (PAL Technologies Ltd., Glasgow, Scotland) [38] Thigh Triaxis accelerometer using capacitive technology Classifies activities as sitting/lying, standing or walking
GENEActiv (Activinsights Ltd., Kimbolton, UK) [39] Thigh Triaxis accelerometer with a near-body temperature sensor Raw-mode data allows for open-source post-data collection filtering
MotionWatch8 (CamNtech, Cambridge, UK) [40] Wrist Triaxis accelerometer using MEMs technology, with ambient light sensor Activity counts from acceleration signals in a single axis only or in vertical magnitude using epoch-based recoding that uses the three axis; raw-mode data allows for post-data collection filtering
  1. Note: Triaxial accelerometers measure acceleration in vertical axis, antero-posterior and medio-lateral