THE VALIDITY OF THE TRITRAC-R3D ACTIVITY MONITOR FOR THE ASSESSMENT OF PHYSICAL-ACTIVITY IN CHILDREN

The purpose of this study was to evaluate the validity of the Tritrac-R3D Activity Monitor, a new instruments designed to improve assessments of physical activity. Comparisons were made with a heart rate monitor and a Caltrac Activity Monitor. Thirty-five children (ages 9-11 years) were monitored on 3 different school days with all 3 instruments. The Tritrac was moderately correlated with the heart rate monitor (r=.58) and highly correlated with the Caltrac monitor (r=.88). By taking advantage of the minute-by-minute timing capability of th Tritrac and the heart rate monitors, it was discovered that the correlations between these instruments were highest during free play situations (lunch/recess, recess, after school) and were lower when activity was more limited (class time) or structured (physical education). The ability of the Tritrac to assess on a minute-by-minute basis may greatly enhance its overall utility.