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Article: Individual calibration for estimating free-living walking speed using the MTI monitor

TitleIndividual calibration for estimating free-living walking speed using the MTI monitor
Authors
Issue Date2006
PublisherLippincott Williams & Wilkins. The Journal's web site is located at http://www.acsm-msse.org
Citation
Medicine And Science In Sports And Exercise, 2006, v. 38 n. 4, p. 761-767 How to Cite?
AbstractPurpose: This study was conducted to devise a new individual calibration method to enhance MTI accelerometer estimation of free-living level walking speed. Method: Five female and five male middle-aged adults walked 400 m at 3.5, 4.5, and 5.5 km·h-1, and 800 m at 6.5 km·h -1 on an outdoor track, following a continuous protocol. Lap speed was controlled by a global positioning system (GPS) monitor. MTI counts-to-speed calibration equations were derived for each trial, for each subject for four such trials with each of four MTI, for each subject for the average MTI, and for the pooled data. Standard errors of the estimate (SEE) with and without individual calibration were compared. To assess accuracy of prediction of free-living walking speed, subjects also completed a self-paced, "brisk" 3-km walk wearing one of the four MTI, and differences between actual and predicted walking speed with and without individual calibration were examined. Results: Correlations between MTI counts and walking speed were 0.90 without individual calibration, 0.98 with individual calibration for the average MTI, and 0.99 with individual calibration for a specific MTI. The SEE (mean ± SD) was 0.58 ± 0.30 km·h-1 without individual calibration, 0.19 ± 0.09 km·h-1 with individual calibration for the average MTI monitor, and 0.16 ± 0.08 km·h -1 with individual calibration for a specific MTI monitor. The difference between actual and predicted walking speed on the "brisk" 3-km walk was 0.06 ± 0.25 km·h-1 using individual calibration and 0.28 ± 0.63 km·h-1 without individual calibration (for specific accelerometers). Conclusion: MTI accuracy in predicting walking speed without individual calibration might be sufficient for population-based studies but not for intervention trials. This individual calibration method will substantially increase precision of walking speed predicted from MTI counts. Copyright © 2006 by the American College of Sports Medicine.
Persistent Identifierhttp://hdl.handle.net/10722/176029
ISSN
2015 Impact Factor: 4.041
2015 SCImago Journal Rankings: 2.007
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorBarnett, Aen_US
dc.contributor.authorCerin, Een_US
dc.date.accessioned2012-11-26T09:04:36Z-
dc.date.available2012-11-26T09:04:36Z-
dc.date.issued2006en_US
dc.identifier.citationMedicine And Science In Sports And Exercise, 2006, v. 38 n. 4, p. 761-767en_US
dc.identifier.issn0195-9131en_US
dc.identifier.urihttp://hdl.handle.net/10722/176029-
dc.description.abstractPurpose: This study was conducted to devise a new individual calibration method to enhance MTI accelerometer estimation of free-living level walking speed. Method: Five female and five male middle-aged adults walked 400 m at 3.5, 4.5, and 5.5 km·h-1, and 800 m at 6.5 km·h -1 on an outdoor track, following a continuous protocol. Lap speed was controlled by a global positioning system (GPS) monitor. MTI counts-to-speed calibration equations were derived for each trial, for each subject for four such trials with each of four MTI, for each subject for the average MTI, and for the pooled data. Standard errors of the estimate (SEE) with and without individual calibration were compared. To assess accuracy of prediction of free-living walking speed, subjects also completed a self-paced, "brisk" 3-km walk wearing one of the four MTI, and differences between actual and predicted walking speed with and without individual calibration were examined. Results: Correlations between MTI counts and walking speed were 0.90 without individual calibration, 0.98 with individual calibration for the average MTI, and 0.99 with individual calibration for a specific MTI. The SEE (mean ± SD) was 0.58 ± 0.30 km·h-1 without individual calibration, 0.19 ± 0.09 km·h-1 with individual calibration for the average MTI monitor, and 0.16 ± 0.08 km·h -1 with individual calibration for a specific MTI monitor. The difference between actual and predicted walking speed on the "brisk" 3-km walk was 0.06 ± 0.25 km·h-1 using individual calibration and 0.28 ± 0.63 km·h-1 without individual calibration (for specific accelerometers). Conclusion: MTI accuracy in predicting walking speed without individual calibration might be sufficient for population-based studies but not for intervention trials. This individual calibration method will substantially increase precision of walking speed predicted from MTI counts. Copyright © 2006 by the American College of Sports Medicine.en_US
dc.languageengen_US
dc.publisherLippincott Williams & Wilkins. The Journal's web site is located at http://www.acsm-msse.orgen_US
dc.relation.ispartofMedicine and Science in Sports and Exerciseen_US
dc.subject.meshAccelerationen_US
dc.subject.meshAdulten_US
dc.subject.meshCalibrationen_US
dc.subject.meshFemaleen_US
dc.subject.meshHumansen_US
dc.subject.meshLeast-Squares Analysisen_US
dc.subject.meshMaleen_US
dc.subject.meshMiddle Ageden_US
dc.subject.meshMonitoring, Physiologic - Instrumentationen_US
dc.subject.meshWalking - Physiologyen_US
dc.titleIndividual calibration for estimating free-living walking speed using the MTI monitoren_US
dc.typeArticleen_US
dc.identifier.emailCerin, E: ecerin@hku.hken_US
dc.identifier.authorityCerin, E=rp00890en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1249/01.mss.0000210206.55941.b2en_US
dc.identifier.pmid16679994-
dc.identifier.scopuseid_2-s2.0-33645959822en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-33645959822&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume38en_US
dc.identifier.issue4en_US
dc.identifier.spage761en_US
dc.identifier.epage767en_US
dc.identifier.isiWOS:000236806100022-
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridBarnett, A=35195335800en_US
dc.identifier.scopusauthoridCerin, E=14522064200en_US

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