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dc.contributor.authorRied-Larsen, Mathiasen
dc.contributor.authorBrønd, Jan Cen
dc.contributor.authorBrage, Sorenen
dc.contributor.authorHansen, Bjørge Hen
dc.contributor.authorGrydeland, Mayen
dc.contributor.authorAndersen, Lars Ben
dc.contributor.authorMøller, Niels Cen
dc.date.accessioned2012-10-03T19:12:58Z
dc.date.available2012-10-03T19:12:58Z
dc.date.issued2012-09-12en
dc.identifier.issn1479-5868
dc.identifier.urihttp://www.dspace.cam.ac.uk/handle/1810/243850
dc.description.abstractAbstractBackgroundMore studies include multiple generations of the Actigraph activity monitor. So far no studies have compared the output including the newest generation and investigated the impact on the output of the activity monitor when enabling the low frequency extension (LFE) option. The aims were to study the responses of four generations (AM7164, GT1M, GT3X and GT3X+) of the Actigraph activity monitor in a mechanical setup and a free living environment with and without enabling the LFE option.MethodsThe monitors were oscillated in a mechanical setup using two radii in the frequency range 0.25-3.0 Hz. Following the mechanical study a convenience sample (N = 20) wore three monitors (one AM7164 and two GT3X) for 24 hours.ResultsThe AM7164 differed from the newer generations across frequencies (p < 0.05) in the mechanical setup. The AM7164 produced a higher output at the lower and at the highest intensities, whereas the output was lower at the middle intensities in the mid-range compared to the newer generations. The LFE option decreased the differences at the lower frequencies, but increased differences at the higher. In free living, the mean physical activity level (PA) of the GT3X was 18 counts per minute (CPM) (8%) lower compared to the AM7164 (p < 0.001). Time spent in sedentary intensity was 26.6 minutes (95% CI 15.6 to 35.3) higher when assessed by the GT3X compared to the AM7164 (p < 0.001). Time spend in light and vigorous PA were 23.3 minutes (95% CI 31.8 to 14.8) and 11.7 minutes (95% CI 2.8 to 0.7) lower when assessed by the GT3X compared to the AM7164 (p < 0.05). When enabling the LFE the differences in the sedentary and light PA intensity (<333 counts*10 sec-1) were attenuated (p > 0.05 for differences between generations) thus attenuated the difference in mean PA (p > 0.05) when the LFE option was enabled. However, it did not attenuate the difference in time spend in vigorous PA and it introduced a difference in time spend in moderate PA (+ 3.0 min (95% CI 0.4 to 5.6)) between the generations.ConclusionWe observed significant differences between the AM7164 and the newer Actigraph GT-generations (GT1M, GT3X and GT3X+) in a mechanical setup and in free-living. Enabling the LFE option attenuated the differences in mean PA completely, but induced a bias in the moderate PA intensities.
dc.languageEnglishen
dc.language.isoen
dc.titleMechanical and free living comparisons of four generations of the Actigraph activity monitoren
dc.typeArticle
dc.date.updated2012-10-03T19:12:58Z
dc.description.versionRIGHTS : This article is licensed under the BioMed Central licence at http://www.biomedcentral.com/about/license which is similar to the 'Creative Commons Attribution Licence'. In brief you may : copy, distribute, and display the work; make derivative works; or make commercial use of the work - under the following conditions: the original author must be given credit; for any reuse or distribution, it must be made clear to others what the license terms of this work are.en
dc.rights.holderMathias Ried-Larsen et al.; licensee BioMed Central Ltd.
prism.publicationDate2012en
dcterms.dateAccepted2012-09-04en
rioxxterms.versionofrecord10.1186/1479-5868-9-113en
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2012-09-12en
dc.contributor.orcidBrage, Soren [0000-0002-1265-7355]
dc.identifier.eissn1479-5868
rioxxterms.typeJournal Article/Reviewen
pubs.funder-project-idMRC (MC_UU_12015/3)


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