Reliability and validity of RT6 accelerometer with comparing different walking self-selected speeds

Abstract

Purpose: The positive effect of physical activity in the prevention and treatment of diseases leads to frequent use of objective measures. The level of physical activity can be assessed in a number of ways, including both devices and questionnaires. The Aim of this study was to assess the reliability and validity of RT6 in healthy, young, sedentary adults. Methods: A total of 41 healthy, young, sedentary adults were recruited to this study. Sociodemographic data and International Physical Activity Questionnare (IPAQ) were collected from the subjects. Subjects wore RT6 accelerometer on their right pelvis and pedometer on their left pelvis. Subjects were asked walk at their normal and brisk walking speeds for 10 minutes. These activities were repeated on a treadmill using the individual speeds from normal ground walking on two settings 1 week apart. Bland-Altman analysis and Cronbach's alpha coefficient were performed to statistical analysis. Results: There was a 63.2% agreement between the treadmill and the normal ground at normal speed measurements; 62.1% agreement between the treadmill and the normal ground at brisk speed; moderate degree of 52.4% agreement between treadmill and retest treadmill ground at normal speed measurements and moderate degree of 56.5% agreement between re-test treadmill and normal ground at brisk speed measurements. There was no statistically significant correlation between the pedometer and other measures (p>0.05). Conclusion: Physical activity positively affects both disease prevention and treatment. Therefore, use of objective methods is very necessary in determining the level of physical activity This study found that RT6 is a valid measurement tool at normal and brisk walking speeds in measurement of physical activity.