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Validity of Triaxial Evaluation Using an Accelerometer in Sit-to-Stand Motion

[Purpose] This study investigated how accurately an accelerometer could estimate the kinematic changes in three axes during the sit-to-stand motion. [Participants and Methods] Seventeen healthy young adult males participated in this study. An accelerometer and an infrared marker attached to the lower backs of the individuals simultaneously measured sit-to-stand. Vertical and longitudinal acceleration data modified for the tilt of the accelerometer were compared with acceleration data estimated by a three-dimensional motion capture system. The intra-class correlation coefficient (ICC) and cross-correlation coefficient (CC) were used to examine the accelerometer measurements’ reliability and similarity, respectively. [Results] The ICC was 0.33 in the lateral, 0.49 in the vertical, and 0.58 in the longitudinal directions. CC indicated similarity of waveforms and the corrected CC was significantly higher in the vertical and longitudinal directions. [Conclusion] An accelerometer is useful for objective evaluation of the sit-to-stand motion in the vertical and longitudinal directions.