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目的 对加速度计(CSA)测量成年人日常体力活动的效度进行验证并提出根据 CSA数据预测能量消耗的方程。方法 选取 72 名北京市居民,年龄(43.6±4.0)岁,男性 33 名,女性 39名,作为调查对象,佩带7天CSA,在同一期间采用双标水方法(DLW) 测量能量消耗,包括平均每天总能量消耗(TEE)、平均每天体力活动能量消耗(AEE)和体力活动水平(PAL)作为验证标准。结果通过CSA测量的平均每天活动计数(AC)与TEE、AEE和PAL之间均呈显著相关,偏相关系数 r 分别为0.31、0.30、0.26(P<0.05)。逐步多元回归分析表明,影响TEE的因素包括去脂体重或体重指数、AC(R2=0.52~0.70),影响AEE的因素包括AC、性别和去脂体重(R2=0.25~0.32)。结论 CSA能准确测量中国成年人日常体力活动模式,AC可以解释TEE和AEE的变异。
Objective To verify the validity of accelerometer (CSA) measurements of daily physical activity in adults and to propose an equation for predicting energy consumption based on CSA data. Methods A total of 72 Beijing residents aged 43.6±4.0 years old, 33 males and 39 females were enrolled as subjects. They were wearing 7 days of CSA, and measured the energy consumption in the same period using double standard water method (DLW). The daily total energy expenditure (TEE), average daily physical activity energy expenditure (AEE), and physical activity level (PAL) were used as validation criteria. Results The average daily activity count (AC) measured by CSA was significantly correlated with TEE, AEE, and PAL. The partial correlation coefficients r were 0.31, 0.30, and 0.26, respectively (P<0.05). Stepwise multiple regression analysis showed that factors affecting TEE included lean body mass or body mass index, AC (R2 = 0.52 to 0.70), and factors affecting AEE included AC, gender, and lean body mass (R2 = 0.25-0.32). Conclusion CSA can accurately measure the daily physical activity pattern in Chinese adults. AC can explain the variation of TEE and AEE.