Document Detail

Test-retest reliability of step counts with the ActivPAL™ device in common daily activities.
MedLine Citation:
PMID:  20655228     Owner:  NLM     Status:  MEDLINE    
AIM: To investigate test-retest reliability of step counts and establish minimal detectable changes (MDC) in step count to account for intra device error over time in various physical activities.
METHODS: Healthy participants (n=24, age range, 19-28 years) performed activities on two occasions, 1 week apart, in a laboratory setting; self-paced floor walking, treadmill walking at three different speeds (3.2 km/h, 4.5 km/h and 4.5 km/h with incline), treadmill jogging (8.0 km/h), stair walking and cycling on an exercise bike at three speeds (45 rpm, 60 rpm and 75 rpm). Relative reliability was calculated using intraclass correlation coefficient (ICC) and Spearman correlation. Absolute reliability was assessed using standard error of measurement (SEM) and coefficient of repeatability (CR).
RESULTS: The ActivPAL showed high to very high relative reliability for treadmill walking at all speeds and stair walking, while self-paced normal floor walking showed moderate reliability. The absolute reliability was the best for treadmill walking activities, slightly increased for self-paced walking, followed by stair walking and jogging. The use of activity monitors during cycling has been questioned and our results confirm a low absolute and relative reliability. MDC values varied according to the type of activity e.g. treadmill walking 4.5 km/h (10 steps), walking on the floor (45 steps). Data loss in this study (10-13%) was higher than previously reported.
CONCLUSIONS: The ActivPAL is reliable for treadmill walking, jogging and self-paced walking. MCD varies according to the activity and should be considered when establishing true change over time.
Gunilla Dahlgren; Daniel Carlsson; Anne Moorhead; Charlotte Häger-Ross; Suzanne M McDonough
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-07-22
Journal Detail:
Title:  Gait & posture     Volume:  32     ISSN:  1879-2219     ISO Abbreviation:  Gait Posture     Publication Date:  2010 Jul 
Date Detail:
Created Date:  2010-09-20     Completed Date:  2011-01-24     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9416830     Medline TA:  Gait Posture     Country:  England    
Other Details:
Languages:  eng     Pagination:  386-90     Citation Subset:  IM    
Copyright Information:
Crown Copyright © 2010. Published by Elsevier B.V. All rights reserved.
Department of Community Medicine and Rehabilitation, Umeå University, SE-901 87 Umeå, Sweden.
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MeSH Terms
Bicycling / physiology
Cohort Studies
Exercise Test / instrumentation*,  methods
Jogging / physiology
Middle Aged
Monitoring, Ambulatory / instrumentation*
Motor Activity*
Observer Variation
Reproducibility of Results
Video Recording
Walking / physiology*
Young Adult

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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