摘要
目的:确定适合我国青年的以Actigraph三轴加速度传感器矢量计数(VM)为自变量的能耗预测方程和判断低、中、高活动强度的VM临界点,为Actigraph三轴加速度传感器的准确应用提供依据。方法:采用Cosmed K4b2便携式气体代谢分析仪和Actigraph GT3X型加速度传感器同步监测受试者体力活动,以间接测热法为能耗监测标准。实验组(男、女各30人)进行静坐、看书、整理书桌、扫地和3种速度的场地上走/跑(4km/h、6km/h和8km/h),以其数据建立VM能耗预测方程和VM临界点,以验证组(男、女各10人)连续约4h的体力活动数据验证本研究所建方程和临界点及文献中已有的VM方程和VM临界点的效度。结果:建立了两个体力活动能耗预测方程(方程1:kcal/min=0.000784×VM+0.054×BM-1.947,方程2:METs=0.000721×VM+1.399),并建立了两组3METs和6METs所对应的VM临界点。经验证,方程1和方程2的PAEE4h预测值与间接测热法测量结果无显著性差异,其他VM方程会显著低估PAEE4h;以ROC曲线法建立的VM临界点可较准确监测4h体力活动内低、中、高强度体力活动的时间,其余VM临界点的监测结果与间接测热法测量结果都有显著性差异。结论:VM是监测日常体力活动的有效变量,建立的VM能耗预测方程和以ROC曲线法建立的VM临界点适用于我国青年日常体力活动监测。
Objective： To determine the VM energy expenditure prediction equations and VM thresholds of Actigraph tri-axial accelerometer for Chinese young adults, and aim to provide evidence for the valid application of Actigraph tri-axial accelerometer. Methods： Participants simultaneously wore Cosmed K4b2 portable indirect calorimetry system and Actigraph GT3X accelerometer to assess their physical activities, indirect calorimetry was used as the criterion measurement of energy expenditure. Subjects of development group （30 men and 30 women） performed activities including sitting, reading, cleaning desk, sweeping and 3 speeds of overg roud walking and jogging （4kin/h, 6km/h and 8km/h）, the data were used to develop VM energy expenditure prediction equations and VM thresholds. Data of the 4h daily physical activ- ity of validation group （10 men and 10 women） were used to validate the equations and thresholds developed in this study and the counterparts already existed. Results： Two equations were developed （equation 1： kcal/min= 0. 000784 ＊ VM ＋ 0. 054 ＊ BM-1. 947, equation 2.METs=0. 000721 ＊ VM ＋ 1. 399）, two sets of VM thresholds of 3METs and 6METs were also established. The validation showed that there was no significant difference between the PAEE4h predicted by the VM equations developed in this study and the PAEE4h measured by indirect calorimetry, other VM equations significantly underestimated PAEE4h. The VM thresholds established by ROC curve were confirmed to be valid in measuring the time of LPA, MPA, VPA and MVPA, the error of other VM thresholds had statistical significance. Conclusion： VM was valid in assessing daily physical activity. The VM energy expenditure prediction equations developed in this study and the thresholds developed by ROC curve were suitable for the physical activity assessment of Chinese young adults.
出处
《体育科学》
CSSCI
北大核心
2013年第11期75-83,88,共10页
China Sport Science
基金
浙江省教育厅科研项目(Y201226077)
关键词
体力活动
加速度传感器
矢量计数
能耗预测方程
临界点
physical activity
accelerometer ~ vector magnitude
energy expenditure prediction equation
threshold
