Absolute intensity thresholds for tri‐axial wrist and waist accelerometer‐measured movement behaviors in adults

Aim This study was aimed to: (1) compare raw triaxial acceleration data from GENEActiv (GA) and ActiGraph GT3X+ (AG) placed on the non‐dominant wrist; (2) compare AG placed on the non‐dominant and dominant wrist, and waist; (3) derive brand‐ and placement‐specific absolute intensity thresholds for inactive and sedentary time, and physical activity intensity in adults. Methods Eighty‐six adults (44 men; 34.6 ± 10.8 years) performed nine activities while simultaneously wearing GA and AG on wrist and waist. Acceleration (in gravitational equivalent units; mg) was compared with oxygen uptake (measured with indirect calorimetry). Results Increases in acceleration mirrored increases in intensity of activities, regardless of device brand and placement. Differences in acceleration between GA and AG worn at the non‐dominant wrist were small but tended to be high at lower intensity activities. Thresholds for differentiating inactivity (