Concurrent validity of the PAM accelerometer relative to the MTI Actigraph using oxygen consumption as a reference
article
The purpose of this study was to examine the concurrent validity of the Personal Activity Monitor (PAM) accelerometer relative to the Actigraph accelerometer using oxygen consumption as a reference, and to assess the test-retest reliability of the PAM. Thirty-two fit, normal weight adults (aged 21-54) performed two activities, treadmill walking and stair walking, while wearing the PAM, the Actigraph and the Cosmed K4b<sup>2</sup>. Correlation coefficients and agreement in absolute energy expenditure (EE) levels between PAM, Actigraph and Cosmed were calculated. The test-retest reliability was examined among 296 PAM's using a laboratory shaker. Intraclass correlation coefficients (ICC) and coefficient of variation (CV) were determined. Correlations for treadmill walking and stair walking, respectively, were r <sup>2</sup>=0.95 and r<sup>2</sup>=0.65 for PAM with Actigraph, r <sup>2</sup>=0.82 and r<sup>2</sup>=0.93 for PAM with VO<sub>2</sub> and r <sup>2</sup>=0.64 and 0.74 for Actigraph with VO<sub>2</sub>. Both the PAM and Actigraph underestimated EE during treadmill and stair walking by a substantial amount. The test-retest reliability of the PAM was high [ICC=0.80; 95% confidence interval (CI) (0.28;0.92) and intra-CV=1.5%]. The PAM and Actigraph accelerometer are comparable in assessing bodily movement during treadmill and stair walking. The PAM is a valid device to rank subjects in EE and can be useful in collecting objective data to monitor habitual physical activity. Copyright © 2009 The Authors.
Topics
TNO Identifier
280003
ISSN
09057188
Source
Scandinavian Journal of Medicine and Science in Sports, 19(1), pp. 36-43.
Pages
36-43
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