Agreement between pedometer and accelerometer in measuring physical activity in overweight and obese pregnant women

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dc.contributor.author Kinnunen, Tarja I -
dc.contributor.author Tennant, Peter WG -
dc.contributor.author McParlin, Catherine -
dc.contributor.author Poston, Lucilla -
dc.contributor.author Robson, Stephen C -
dc.contributor.author Bell, Ruth -
dc.date.accessioned 2012-06-17T20:14:21Z
dc.date.available 2012-06-17 16:43:08 -
dc.date.available 2012-06-17T20:14:21Z
dc.date.issued 2011 -
dc.identifier.issn 1471-2458 -
dc.identifier.uri http://tampub.uta.fi/handle/10024/65898
dc.description BioMed Central Open access -
dc.description.abstract Background Inexpensive, reliable objective methods are needed to measure physical activity (PA) in large scale trials. This study compared the number of pedometer step counts with accelerometer data in pregnant women in free-living conditions to assess agreement between these measures. Methods Pregnant women (n = 58) with body mass index ≥25 kg/m2 at median 13 weeks' gestation wore a GT1M Actigraph accelerometer and a Yamax Digi-Walker CW-701 pedometer for four consecutive days. The Spearman rank correlation coefficients were determined between pedometer step counts and various accelerometer measures of PA. Total agreement between accelerometer and pedometer step counts was evaluated by determining the 95% limits of agreement estimated using a regression-based method. Agreement between the monitors in categorising participants as active or inactive was assessed by determining Kappa. Results Pedometer step counts correlated moderately (r = 0.36 to 0.54) with most accelerometer measures of PA. Overall step counts recorded by the pedometer and the accelerometer were not significantly different (medians 5961 vs. 5687 steps/day, p = 0.37). However, the 95% limits of agreement ranged from -2690 to 2656 steps/day for the mean step count value (6026 steps/day) and changed substantially over the range of values. Agreement between the monitors in categorising participants to active and inactive varied from moderate to good depending on the criteria adopted. Conclusions Despite statistically significant correlations and similar median step counts, the overall agreement between pedometer and accelerometer step counts was poor and varied with activity level. Pedometer and accelerometer steps cannot be used interchangeably in overweight and obese pregnant women. -
dc.language.iso en -
dc.title Agreement between pedometer and accelerometer in measuring physical activity in overweight and obese pregnant women -
dc.type fi=Artikkeli aikakauslehdessä | en=Journal article| -
dc.identifier.urn urn:nbn:uta-3-659 -
dc.identifier.doi 10.1186/1471-2458-11-501 -
dc.type.version fi=Kustantajan versio | en=Publisher's version| -
dc.subject.okm fi=Terveystiede | en=Health care science| -
dc.administrativeunit fi=Terveystieteiden yksikkö | en=School of Health Sciences| -
dc.journal.title BMC Public Health -
dc.journal.volume 11 -
dc.journal.number 501 -
dc.journal.volumepagerange 1-9 -
dc.oldstats 68 -

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