Development and validation of GT3X accelerometer cut-off points in 5- to 9-year-old children based on indirect calorimetry measurements

Jimmy, Gerda; Seiler, Roland; Mäder, Urs (2013). Development and validation of GT3X accelerometer cut-off points in 5- to 9-year-old children based on indirect calorimetry measurements. Schweizerische Zeitschrift für Sportmedizin und Sporttraumatologie, 61(4), pp. 37-43. Schweizerische Gesellschaft für Sportmedizin SGSM

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The ActiGraph accelerometer is commonly used to measure physical activity in children. Count cut-off points are needed when using accelerometer data to determine the time a person spent in moderate or vigorous physical activity. For the GT3X accelerometer no cut-off points for young children have been published yet. The aim of the current study was thus to develop and validate count cut-off points for young children. Thirty-two children aged 5 to 9 years performed four locomotor and four play activities. Activity classification into the light-, moderate- or vigorous-intensity category was based on energy expenditure measurements with indirect calorimetry. Vertical axis as well as vector magnitude cut-off points were determined through receiver operating characteristic curve analyses with the data of two thirds of the study group and validated with the data of the remaining third. The vertical axis cut-off points were 133 counts per 5 sec for moderate to vigorous physical activity (MVPA), 193 counts for vigorous activity (VPA) corresponding to a metabolic threshold of 5 MET and 233 for VPA corresponding to 6 MET. The vector magnitude cut-off points were 246 counts per 5 sec for MVPA, 316 counts for VPA - 5 MET and 381 counts for VPA - 6 MET. When validated, the current cut-off points generally showed high recognition rates for each category, high sensitivity and specificity values and moderate agreement in terms of the Kappa statistic. These results were similar for vertical axis and vector magnitude cut-off points. The current cut-off points adequately reflect MVPA and VPA in young children. Cut-off points based on vector magnitude counts did not appear to reflect the intensity categories better than cut-off points based on vertical axis counts alone.

Item Type:

Journal Article (Original Article)

Division/Institute:

07 Faculty of Human Sciences > Institute of Sport Science (ISPW)
07 Faculty of Human Sciences > Institute of Sport Science (ISPW) > Sport Science II

UniBE Contributor:

Seiler, Roland

Subjects:

700 Arts > 790 Sports, games & entertainment
600 Technology > 610 Medicine & health

ISSN:

1022-6699

Publisher:

Schweizerische Gesellschaft für Sportmedizin SGSM

Language:

English

Submitter:

Roland Seiler

Date Deposited:

28 Mar 2014 12:06

Last Modified:

08 Dec 2014 19:16

Uncontrolled Keywords:

physical activity measurement, value calibration, triaxial accelerometer, indirect calorimetry

BORIS DOI:

10.7892/boris.41860

URI:

https://boris.unibe.ch/id/eprint/41860

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