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