Aim: The purpose of this study was to examine the validity of physical activity by a triaxial accelerometer which was developed in Japan recently. Subjects and Method :Ten healthy young students were studied in this study. They wore a triaxial accelerometer during their daily activities, and their physical activities (lying, sitting, standing, and walking) were videotaped. We examined relationships between the time measured with a triaxial accelerometer and that measured with video camera, and also analyzed the errors between the two measurements by Bland-Altman analysis. Results: The relevance between the two measurements showed a very strong correlation in all measurements. There were no additional errors among supine, standing, and walking but there was additional error in sitting position.There were no proportional errors in all four positions. Conclusion: The validity of physical activity measured by a triaxial accelerometer newly developed was suggested in this study.
[Purpose] The purpose of this study was to evaluate the number of measurement days needed to measure physical activity time with respect to bodily posture and movement using a triaxial accelerometer, which detects tilt, that has recently been developed. [Methods] Physical activity time of 16 healthy young students with respect to bodily posture and movement was monitored during the daytime for one week using a triaxial accelerometer.[Results] The mean activity times for walking, standing, sitting, and lying were 141, 68, 466, and 40, respectively. Lying time on Sunday was significantly longer than those on Monday, Tuesday, Thursday, and Friday. A significant intra-class correlation was obtained at 7 days for walking and standing, and at 6 days for sitting and lying.[Conlusions] We conclude that the physical activity time with respect to bodily posture and movement using a triaxial accelerometer was obtained accurately. The numbers of days required for accurate measurement of walking/standing were at least six days and for sitting / lying were at least seven days.
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