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Triaxial accelerometer: accelerations/decelerations, velocity and displacement of a body segment in x, y, z axes. |
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Gyroscope: angular velocity and rotation. |
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Global positioning satellite (GPS) signal: location primarily outdoors; may calculate speed and distance of continuous walking with smartphone app. |
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Magnetometer: directional vectors of spatial orientation. |
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Electromyography: dry electrodes for surface EMG of timing and amount of muscle group activation. |
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Goniometer: joint angular range of motion. |
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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. |
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Environmental context: ambient sound, light, motion-activated photo or video. |
