Triaxial accelerometer: accelerations/decelerations, velocity and displacement of a body segment in x, y, z axes. |
Gyroscope: angular velocity and rotation. |
Global positioning satellite (GPS) signal: location primarily outdoors; may calculate speed and distance of continuous walking with smartphone app. |
Magnetometer: directional vectors of spatial orientation. |
Electromyography: dry electrodes for surface EMG of timing and amount of muscle group activation. |
Goniometer: joint angular range of motion. |
Resistive flex and pressure sensing: fiberoptic or deformable textile across a joint detects angular change; piezoelectrode for distribution of weight on sole to define stance in the gait cycle. |
Environmental context: ambient sound, light, motion-activated photo or video. |