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Inter-Instrument Reliability of the Actigraph GT3X+ Ambulatory Activity Monitor During Free-Living Conditions in Adults

Jarrett, H.; Fitzgerald, L.; Routen, A.C.

Inter-Instrument Reliability of the Actigraph GT3X+ Ambulatory Activity Monitor During Free-Living Conditions in Adults Thumbnail


Authors

H. Jarrett

L. Fitzgerald

A.C. Routen



Abstract

Background: Currently, no studies have investigated inter-instrument reliability of the ActiGraph (AG) GT3X+ in free-living conditions. Methods: Nineteen adults (11 males, 8 females; aged 36.8 ± 11.9 years) wore a pair of AG’s (one on each hip), during all waking hours for one day. Raw outputs were generated for total counts, steps, wear time and mean counts per minute. Intensity outputs were derived for time (minutes) spent in 0.05). Conclusion: Reliability decreases beyond moderate intensities. MVPA displays superior inter-instrument reliability than individual intensity categories. Research question permitting, reporting time in MVPA may maximise reliability.

Citation

Jarrett, H., Fitzgerald, L., & Routen, A. (2015). Inter-Instrument Reliability of the Actigraph GT3X+ Ambulatory Activity Monitor During Free-Living Conditions in Adults. Journal of Physical Activity and Health, 12(3), 382-387. https://doi.org/10.1123/jpah.2013-0070

Journal Article Type Article
Acceptance Date Jan 14, 2014
Publication Date Mar 1, 2015
Deposit Date Aug 6, 2014
Publicly Available Date Mar 1, 2016
Journal Journal of Physical Activity and Health
Print ISSN 1543-3080
Electronic ISSN 1543-5474
Publisher Human Kinetics
Peer Reviewed Peer Reviewed
Volume 12
Issue 3
Pages 382-387
DOI https://doi.org/10.1123/jpah.2013-0070
Keywords Accelerometry, Physical Activity, Tri-axial, Derived Outputs.

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