Caltrac加速度计对跑步、竞走和踏步的能量消耗估计。
Energy expenditure estimates of the Caltrac accelerometer for running, race walking, and stepping.
作者信息
Swan P D, Byrnes W C, Haymes E M
机构信息
Department of Exercise Science and Physical Education, Arizona State University, Tempe 85287-0701, USA.
出版信息
Br J Sports Med. 1997 Sep;31(3):235-9. doi: 10.1136/bjsm.31.3.235.
OBJECTIVE
To examine the accuracy of the Caltrac accelerometer for estimating energy expenditure (EE) during three exercise modes.
METHODS
A subset of 31 women (mean (SEM) age 22.6 (5) years) as selected from a training study comparing various physiological parameters during race walking, running, and stepping. Subjects each performed mode specific graded exercise tests to peak VO2. Regression equations for VO2 v heart rate (HR) were generated from each individual's test data. EE (kcal and kJ) was estimated for each VO2 value based on the respiratory exchange ratio, and kcal v HR regression equations were generated to predict EE from each subject's HR data (EE-HR). HR in the field was monitored by telemetry, and two Caltrac monitors, one set for EE and one to give counts, were attached to a belt over opposite hips.
RESULTS
EE-HR was not significantly different across exercise modes. Caltrac overestimated EE (P < 0.01) in runners (14%) and walkers (19%) but underestimated EE in steppers by about 10% (P = 0.12).
CONCLUSIONS
The Caltrac is a reliable instrument but it did not accurately distinguish EE in running, race walking, or stepping in a group of young women.
目的
研究Caltrac加速度计在三种运动模式下估算能量消耗（EE）的准确性。
方法
从一项训练研究中选取31名女性（平均（标准误）年龄22.6（5）岁）作为子集，该研究比较了竞走、跑步和踏步过程中的各种生理参数。受试者分别进行特定模式的分级运动测试至峰值摄氧量（VO2）。根据每个个体的测试数据生成VO2与心率（HR）的回归方程。基于呼吸交换率为每个VO2值估算EE（千卡和千焦），并生成千卡与HR的回归方程以根据每个受试者的HR数据预测EE（EE-HR）。通过遥测监测现场的HR，并将两个Caltrac监测器，一个设置用于EE，一个用于计数，分别系在相对臀部上方的腰带上。
结果
不同运动模式下的EE-HR无显著差异。Caltrac高估了跑步者（14%）和步行者（19%）的EE（P < 0.01），但低估了踏步者的EE约10%（P = 0.12）。
结论
Caltrac是一种可靠的仪器，但在一组年轻女性中，它不能准确区分跑步、竞走或踏步时的EE。
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