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Classification Accuracy of the Wrist-Worn Gravity Estimator of Normal Everyday Activity Accelerometer

Content Provider	Scilit
Author	Welch, Whitney A. Bassett, David R. Thompson, Dixie L. Freedson, Patty S. Staudenmayer, John W. John, Dinesh Steeves, Jeremy A. Conger, Scott A. Ceaser, Tyrone Howe, Cheryl A. Sasaki, Jeffer E. Fitzhugh, Eugene C.
Copyright Year	2013
Description	Journal: Medicine & Science In Sports & Exercise Purpose The purpose of this study was to determine whether the published left-wrist cut points for the triaxial Gravity Estimator of Normal Everyday Activity (GENEA) accelerometer are accurate for predicting intensity categories during structured activity bouts. Methods A convenience sample of 130 adults wore a GENEA accelerometer on their left wrist while performing 14 different lifestyle activities. During each activity, oxygen consumption was continuously measured using the Oxycon mobile. Statistical analysis used Spearman’s rank correlations to determine the relationship between measured and estimated intensity classifications. Cross tabulations were constructed to show the under- or overestimation of misclassified intensities. One-way χ2 tests were used to determine whether the intensity classification accuracy for each activity differed from 80%. Results For all activities, the GENEA accelerometer-based physical activity monitor explained 41.1% of the variance in energy expenditure. The intensity classification accuracy was 69.8% for sedentary activities, 44.9% for light activities, 46.2% for moderate activities, and 77.7% for vigorous activities. The GENEA correctly classified intensity for 52.9% of observations when all activities were examined; this increased to 61.5% with stationary cycling removed. Conclusions A wrist-worn triaxial accelerometer has modest-intensity classification accuracy across a broad range of activities when using the cut points of Esliger et al. Although the sensitivity and the specificity are less than those reported by Esliger et al., they are generally in the same range as those reported for waist-worn, uniaxial accelerometer cut points.
Related Links	http://europepmc.org/articles/pmc3778030?pdf=render https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3778030/pdf
Ending Page	2019
Page Count	8
Starting Page	2012
ISSN	01959131
e-ISSN	15300315
DOI	10.1249/mss.0b013e3182965249
Journal	Medicine & Science In Sports & Exercise
Issue Number	10
Volume Number	45
Language	English
Publisher	Ovid Technologies (Wolters Kluwer Health)
Publisher Date	2013-10-01
Access Restriction	Open
Subject Keyword	Journal: Medicine & Science In Sports & Exercise Physical Activity Energy Expenditure
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Physical Therapy, Sports Therapy and Rehabilitation Sports Science

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