NDLI: Intra- and Inter-Instrument Reliability of the Actiwatch 4 Accelerometer in a Mechanical Laboratory Setting

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Intra- and Inter-Instrument Reliability of the Actiwatch 4 Accelerometer in a Mechanical Laboratory Setting

Content Provider	PubMed Central
Author	Routen, Ashley C. Upton, Dominic Edwards, Martin G. Peters, Derek M.
Copyright Year	2012
Abstract	This study aimed to quantify the intra-and inter-instrument reliability of the Actiwatch 4 accelerometer (AW4) in a mechanical setting. Twenty seven AW4 were attached to an isokinetic dynamometer and subjected to angular acceleration for 30 min at 50 deg/sec representing moderate intensity (MPA condition) and 200 deg/sec representing vigorous intensity (VPA condition), with a repeat trial conducted. Reliability was assessed using coefficient of variation (CV), absolute percent error (APE), and intraclass correlation coefficients (ICC). Mean AW4 activity counts displayed acceptable reliability according to CV in both conditions (ConMPA: CVintra = 4.6%, APEintra = 6.6%, CVinter = 6.4%, APEinter = 5.2%; ConVPA: CVintra = 3.9%, APEintra = 5.6%, CVinter = 5.9%, APEinter = 4.7%). When counts were re-categorised into minutes of MPA and VPA, lower CV values were observed (ConMPA: CVintra = 3.2%, APEintra = 4.5%, CVinter = 4.3%, APEinter = 3.2%; ConVPA: CVintra = 0.0%, APEintra = 0.0%, CVinter = 0.0%, APEinter = 0.0%). When activity counts were re-categorised as minutes of MVPA, excellent reliability was observed (CVintra, APEintra, CVinter, and APEinter = 0.0%) in both conditions. Mean AW4 activity counts exhibit reliability statistics comparable to other accelerometers. Reliability is improved when activity counts are re-categorised as time spent in MPA and VPA, with greatest reliability obtained when counts are recategorised as time spent in MVPA. As MVPA is the subcomponent of physical activity most associated with health benefits it would appear that the AW4 is reliable for measuring time spent in this health enhancing intensity category, at least from testing in a mechanical laboratory setting.
Related Links	http://dx.doi.org/10.2478/v10078-012-0002-z
Ending Page	24
Starting Page	17
File Format	PDF
ISSN	18997562
e-ISSN	18997562
Journal	Journal of Human Kinetics
Volume Number	31
Language	English
Publisher	Akademia Wychowania Fizycznego w Katowicach
Publisher Date	2012-01-01
Access Restriction	Open
Rights Holder	Akademia Wychowania Fizycznego w Katowicach
Subject Keyword	Physical Therapy, Sports Therapy and Rehabilitation Physiology (medical) Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Physiology (medical) Physical Therapy, Sports Therapy and Rehabilitation Sports Science

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