Skip Navigation LinksHome > September 2014 - Volume 46 - Issue 9 > Cross-validation of Waist-Worn GENEA Accelerometer Cut-Point...
Medicine & Science in Sports & Exercise:
doi: 10.1249/MSS.0000000000000283
Applied Sciences

Cross-validation of Waist-Worn GENEA Accelerometer Cut-Points

WELCH, WHITNEY A.1; BASSETT, DAVID R.1; FREEDSON, PATTY S.2; JOHN, DINESH3; STEEVES, JEREMY A.1; CONGER, SCOTT A.1; CEASER, TYRONE G.1; HOWE, CHERYL A.2; SASAKI, JEFFER E.2

Collapse Box

Abstract

Purpose: The purpose of this study was to determine the classification accuracy of the waist gravity estimator of normal everyday activity (GENEA) cut-points developed by Esliger et al. for predicting intensity categories across a range of lifestyle activities.

Methods: Each participant performed one of two routines, consisting of seven lifestyle activities (home/office, ambulatory, and sport). The GENEA was worn on the right waist, and oxygen uptake was continuously measured using the Oxycon mobile. A one-way chi-squared test was used to determine the classification accuracy of the GENEA cut-points. Cross-tabulation tables provided information on under- and overestimations, and sensitivity and specificity analyses of the waist cut-points were also performed.

Results: Spearman rank order correlation for the GENEA gravity-subtracted signal vector magnitude and Oxycon mobile MET values was 0.73. For all activities combined, the GENEA accurately predicted intensity classification 55.3% of the time, and it increased to 58.3% when stationary cycling was removed from the analysis. The sensitivity of the cut-points for the four intensity categories ranged from 0.244 to 0.958, and the specificity ranged from 0.576 to 0.943.

Conclusion: In this cross-validation study, the proposed GENEA cut-points had a low overall accuracy rate for classifying intensity (55.3%) when engaging in 14 different lifestyle activities.

© 2014 American College of Sports Medicine

Login

Article Tools

Share

Search for Similar Articles
You may search for similar articles that contain these same keywords or you may modify the keyword list to augment your search.

Connect With Us