Matthews C E, Freedson P S
School of Public Health and Health Sciences, Department of Exercise Science, University of Massachusetts, Amherst 01003, USA.
Med Sci Sports Exerc. 1995 Jul;27(7):1071-8. doi: 10.1249/00005768-199507000-00017.
We examined the ability of the Tritrac-R3D to estimate daily energy expenditure (EE) and characterize the physical activity patterns of free-living humans. Daily EE was estimated by the Tritrac, a 3-d physical activity log (PAL), and a 7-d recall (SDR). Digital storage of activity data by the Tritrac allowed us to tabulate the number of minutes the monitor recorded EE at specific activity intensities. Twenty-five men and women (mean age and body mass 26.7 yr, 72.5 kg) wore the monitor for 7 d. The Tritrac significantly underestimated daily EE compared with the PAL and SDR, 2552.7 vs 2915.5 kcal.d-1 and 2530.0 vs 2840.3 kcal.d-1, respectively (both, P < 0.01). Correlations between the Tritrac and PAL and the SDR were r = 0.82 and r = 0.77 (both, P < 0.001). Compared with the PAL, the Tritrac overestimated time accumulated in sedentary activities (862.7 vs 827.2 min.d-1) but underestimated time accumulated in active behaviors (37.5 vs 78.0 min.d-1). In conclusion, these data suggest the Tritrac ranks activity levels similarly to the PAL and SDR but it significantly underestimates free-living energy expenditure.
我们研究了Tritrac - R3D估计日常能量消耗（EE）以及描述自由生活人群身体活动模式的能力。通过Tritrac、三维身体活动日志（PAL）和7天回忆法（SDR）来估计日常EE。Tritrac对活动数据的数字存储使我们能够将监测器记录特定活动强度下EE的分钟数制成表格。25名男性和女性（平均年龄和体重分别为26.7岁、72.5千克）佩戴监测器7天。与PAL和SDR相比，Tritrac显著低估了日常EE，分别为2552.7千卡/天对2915.5千卡/天以及2530.0千卡/天对2840.3千卡/天（两者均P < 0.01）。Tritrac与PAL以及SDR之间的相关性分别为r = 0.82和r = 0.77（两者均P < 0.001）。与PAL相比，Tritrac高估了久坐活动累积的时间（862.7分钟/天对827.2分钟/天），但低估了活跃行为累积的时间（37.5分钟/天对78.0分钟/天）。总之，这些数据表明Tritrac对活动水平的分级与PAL和SDR相似，但它显著低估了自由生活状态下的能量消耗。
