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Evaluation of the Omron HJ-720ITC Pedometer under Free-Living Conditions.
MedLine Citation:
PMID:  21311356     Owner:  NLM     Status:  Publisher    
INTRODUCTION:: The primary purpose of this study was to examine the accuracy of the Omron HJ-720ITC piezoelectric pedometer in a free-living environment over a 24-h period. A secondary purpose was to compare the accuracy the Omron to that of a spring-levered pedometer. METHODS:: 62 adult volunteers were classified according to BMI category: normal weight (N= 19), overweight (N= 23), and obese (N= 20). Subjects wore five devices over a 24-h period except when bathing or sleeping. The criterion pedometer (StepWatch-3) was worn on the lateral side of the right ankle. Omron HJ-720ITC pedometers were worn in three locations: (a) on the belt, (b) in the pants pocket, and (c) on a lanyard around the neck. A comparison pedometer (Yamax SW-200) was worn on the belt. RESULTS:: The Omron HJ-720ITC underestimated steps per day in all three BMI categories compared to the criterion measure (P < 0.05). The Omron was most accurate in the pocket location, recording 68%, 70%, and 65% of steps in the normal, overweight, and obese BMI categories, respectively. In the obese group, the Omron was more accurate than the Yamax pedometer, but in the normal and overweight groups, it was less accurate than the Yamax. CONCLUSION:: Results from our study show that the Omron significantly underestimates steps per day under free-living conditions. This is due, in part, to the presence of a four-second step filter that contributes to an underestimation of steps accumulated during, intermittent activities. In the pocket, the Omron accuracy was similar for lean, overweight, and obese individuals. In contrast, the Yamax accuracy declined with increasing BMI categories.
Nathan A Silcott; David R Bassett; Dixie L Thompson; Eugene C Fitzhugh; Jeremy A Steeves
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-2-8
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  -     ISSN:  1530-0315     ISO Abbreviation:  -     Publication Date:  2011 Feb 
Date Detail:
Created Date:  2011-2-11     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
The University of Tennessee, Knoxville, Knoxville, TN.
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