Janz K F
Department of Physical Education and Sports Studies, University of Iowa, Iowa City 52242.
Med Sci Sports Exerc. 1994 Mar;26(3):369-75.
The Computer Science Application (CSA) accelerometer is designed to detect the acceleration and deceleration of human movement. The purpose of this study was to evaluate its validity and utility for measuring children's activity in field settings. The criterion measure was heart rate telemetry. This study also examined the between-day stability of children's physical activity. Thirty-one children (7-15 yr) wore a CSA accelerometer and a heart rate telemetry monitor for 12 h.d-1 for 3 consecutive days. The validity correlation coefficients between accelerometry and heart rate telemetry for each monitored day ranged from r = 0.50-0.74. All children reported the accelerometer to be comfortable to wear. The moderate to high validity correlations and the subjects' favorable response to wearing the accelerometer support its validity and utility as an objective method for monitoring activity in children in field settings. However, the between-day stability of individual physical activity measures was low to moderate (r = -0.23 to 0.53), indicating that when using accelerometry or heart rate telemetry more than 3 d of monitoring is needed to assess usual activity.
计算机科学应用（CSA）加速度计旨在检测人体运动的加速和减速。本研究的目的是评估其在实地环境中测量儿童活动的有效性和实用性。标准测量方法是心率遥测。本研究还考察了儿童身体活动的日间稳定性。31名儿童（7 - 15岁）连续3天每天佩戴CSA加速度计和心率遥测监测器12小时。每天监测的加速度测量与心率遥测之间的有效性相关系数范围为r = 0.50 - 0.74。所有儿童均表示佩戴加速度计很舒适。中度到高度的有效性相关性以及受试者对佩戴加速度计的良好反应，支持了其作为实地环境中监测儿童活动的客观方法的有效性和实用性。然而，个体身体活动测量的日间稳定性为低到中度（r = -0.23至0.53），这表明在使用加速度测量法或心率遥测法时，需要超过3天的监测来评估日常活动。
