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Validity and comparability of a wrist-worn accelerometer in children.
Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences, Björn Ekblom's research group.ORCID iD: 0000-0001-6058-4982
Karolinska Institutet.
Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences, Björn Ekblom's research group.ORCID iD: 0000-0002-3901-7833
Cambridge University. (MRC Epidemiology)
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2012 (English)In: Journal of Physical Activity and Health, ISSN 1543-3080, Vol. 9, no 3, 389-393 p.Article in journal (Refereed) Published
Abstract [en]

BACKGROUND:

Wrist-worn accelerometers may provide an alternative to hip-worn monitors for assessing physical activity as they are easier to wear and may thus facilitate long-term recordings. The current study aimed at a) assessing the validity of the Actiwatch (wrist-worn) for estimating energy expenditure, b) determining cut-off values for light, moderate, and vigorous activities, c) studying the comparability between the Actiwatch and the Actigraph (hip-worn), and d) assessing reliability.

METHODS:

For validity, indirect calorimetry was used as criterion measure. ROC-analyses were applied to identify cut-off values. Comparability was tested by simultaneously wearing of the 2 accelerometers during free-living condition. Reliability was tested in a mechanical shaker.

RESULTS:

All-over correlation between accelerometer output and energy expenditure were found to be 0.80 (P < .001).Based on ROC-analysis, cut-off values for 1.5, 3, and 6 METs were found to be 80, 262, and 406 counts per 15 s, respectively. Energy expenditure estimates differed between the Actiwatch and the Actigraph (P < .05). The intra- and interinstrument coefficient of variation of the Actiwatch ranged between 0.72% and 8.4%.

CONCLUSION:

The wrist-worn Actiwatch appears to be valid and reliable for estimating energy expenditure and physical activity intensity in children aged 8 to 10 years.

Place, publisher, year, edition, pages
2012. Vol. 9, no 3, 389-393 p.
National Category
Medical and Health Sciences
Research subject
Medicine/Technology
Identifiers
URN: urn:nbn:se:gih:diva-2237PubMedID: 22454440OAI: oai:DiVA.org:gih-2237DiVA: diva2:517352
Available from: 2012-04-23 Created: 2012-04-23 Last updated: 2016-09-05Bibliographically approved

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PubMedhttp://www.ncbi.nlm.nih.gov/pubmed/22454440

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