Pambianco G, Wing R R, Robertson R
University of Pittsburgh, PA 15213.
Med Sci Sports Exerc. 1990 Dec;22(6):858-62. doi: 10.1249/00005768-199012000-00020.
The Caltrac accelerometer is designed to assess energy expenditure during normal activity. The aims of the present study were (a) to determine the interinstrument and intersession reliability of the Caltrac and (b) to validate these instruments with measures of oxygen uptake (VO2) and determine whether Caltracs accurately reflect differences in energy expenditure due to sex, body weight, and speed. Caltracs were found to have very good interinstrument and intersession reliability and to accurately reflect differences in expenditure due to sex, weight, and speed. However, Caltracs consistently over-estimated energy expenditure by an average of 9-13%. The absolute percent error (percent error without consideration of the sign) of the Caltrac was greater, averaging 23%. The correlations between Caltrac and VO2 averaged 0.68-0.74. Thus, the Caltracs seem well suited for studies of activity level of groups, but may be less useful in estimating an individual's activity.
Caltrac加速度计旨在评估正常活动期间的能量消耗。本研究的目的是：（a）确定Caltrac在不同仪器之间和不同测量期间的可靠性；（b）通过测量摄氧量（VO2）来验证这些仪器，并确定Caltrac是否能准确反映因性别、体重和速度导致的能量消耗差异。研究发现，Caltrac在不同仪器之间和不同测量期间具有很好的可靠性，并且能准确反映因性别、体重和速度导致的能量消耗差异。然而，Caltrac始终高估能量消耗，平均高估9% - 13%。Caltrac的绝对百分比误差（不考虑符号的百分比误差）更大，平均为23%。Caltrac与VO2之间的相关性平均为0.68 - 0.74。因此，Caltrac似乎非常适合用于研究群体的活动水平，但在估计个体活动方面可能用处较小。
