Table 1 Characteristics of ActiGraph devices
ActiGraph devices | Sensor types | Dynamic range | Sensitivity | Sampling frequency | Filter types | Analysis algorithms | Actilife version | Communication mode | Firmware version |
|---|---|---|---|---|---|---|---|---|---|
7161 | Piezoelectric sensor (accelerometer) | 0.05–2.13 g (1 g = 9.81 m/s2) | NR | 10 Hz | Band-pass filter (0.21–2.28 Hz) | NR | NR | NR | NR |
GT1M | Capacitive MEMS sensor (accelerometer) |  ± 5 g (0.05–2 g) | NR | 30 Hz | Band-pass filter (bandwidth of 0.25–2.5 Hz) | Step count: per-epoch basis; | NR | NR | 7.5.0 |
GT3X + /wGT3X +  | Capacitive MEMS sensor (accelerometer) |  ± 3 g or ± 6 g | 3 ng/LSB | 30 to 100 Hz with step of 10 | Band-pass filter (bandwidth of 0.25–2.5 Hz) | Step count: per-epoch basis; | ActiLife 6.13.3 | Wireless | 3.2.1 and 2.5.0 for GT3X + ; 2.5.0 for w GT3X + ; |
wGT3X − BT | Capacitive MEMS sensor (accelerometer) |  ± 8 g | 4 ng/LSB | 30 to 100 Hz with step of 10 | Band-pass filter (bandwidth of 0.25–2.5 Hz) | Step count: per-epoch basis; | ActiLife 6.12.0 | Bluetooth | 1.9.2 |
GT9X +  | (accelerometer, gyroscope and magnetometer) |  ± 8 g and ± 16 g; ± 2000 deg/s; ± 4800 micro-Tesla | NR | 30 to 100 Hz with step of 10 | Band-pass filter (bandwidth of 0.25–2.5 Hz) | NR | ActiLife 6.11.5 | Bluetooth | 1.7.2 |