Reliability and Validity of LivePod LP2 in Measuring Energy Expenditure during Treadmill Walking and Running

Due to accelerometers' characteristics such as light,objective and accurate,they are widely used in physical activity measurement and evaluation.LivePod LP2 is a domestic new accelerometer,which is based on three axis acceleration MEMS sensor technology,using intelligent fuzzy recognition Model of human body movements and Individuation Consume Energy measurement Model to identify human body energy expenditure in movements.In this paper,the reliability and validity of LivePod LP2 in measurement are verified.26 subjects wearing LivePod LP2s in four different postions motioned at three speeds(4,6,8 km/h).Through calculation of ICC of every minute on each level,we evalue the agreement of LivePod LP2,and we can see the ICC value is in 0.978 ~ 0.997 indicating high reliability level;By using correlation analysis,matching sample t-test and Bland-Altman analysis between the instrument and MAXⅡ,we can see:at all three speeds,criterion validity of LivePod LP2 is between 0.7 and 0.8,and the validity of LivePod LP2 wearing in the loins when jogging is the highest.LivePod LP2 can be used to predict the energy expenditure in physical activity.During daily application,the user can fix LivePod LP2 to the right waist to monitor movement energy expenditure.