It had been proved by many studies that the energy expenditure and training intensity could be assessed by the integral of acceleration amplitude of physical activity . this method has been considered to be the most potential method for the assessment of physical activity 大量的研究表明，使用人体运动过程中的加速度向量幅值对时间的积分，可以较好的估计运动的能耗，进而可以估计运动量和运动强度，使用加速度传感器估计运动量的方法是目前公认的最有前途的估计方法。
