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Medicine & Science in Sports & Exercise:
doi: 10.1249/MSS.0000000000000283
Original Investigation: PDF Only

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

Welch, Whitney A.; Bassett, David R.; Freedson, Patty S.; John, Dinesh; Steeves, Jeremy A.; Conger, Scott A.; Ceaser, Tyrone G.; Howe, Cheryl A.; Sasaki, Jeffer E.

Published Ahead-of-Print
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Purpose: The purpose of this study was to determine the classification accuracy of the waist 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-square was used to determine the classification accuracy of the GENEA cut-points. Cross tabulation tables provided information on under- and over-estimations, and sensitivity and specificity analyses of the waist cut-points were also performed.

Results: Spearman's rank order correlation for the GENEA SVMgs and Oxycon mobile MET values was 0.73. For all activities combined, the GENEA accurately predicted intensity classification 55.3% of the time, and 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.

(C) 2014 American College of Sports Medicine


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