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The Effect of Anatomical Placement and Trunk Adiposity on the Reliability and Validity of Triaxial Accelerometer Output during Treadmill Exercise.
MedLine Citation:
PMID:  23223829     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
BACKGROUND: Accelerometers are commonly used to quantify physical activity. There is no accordance regarding the most suitable attachment site. This study assessed the reliability and validity of accelerometer output (PAC) from two placements. METHODS: 26 females (age 20.4 ± 1.3 years, body mass 62.7 ± 6.8 kg) twice performed a 16-minute treadmill protocol comprising four stages (4, 5, 8, 10 km·hr-1) and oxygen uptake (VO2) was calculated. Participants wore an accelerometer at the hip and lower-back. Skinfold thickness was measured at eight sites. Reliability was assessed using coefficients of variation (CVintra). Interactions between placement, velocity and PAC (counts·5s-1) were assessed using analysis of covariance. PAC-VO2 associations were assessed using multiple regression. RESULTS: Hip and back placements returned similar reliability (CVintra = 3.0% and 2.8% respectively). Hip PAC were higher (p < 0.01) during walking with no differences observed during running. Indices of adiposity were related to hip PAC. Regression revealed hip and back PAC as significant predictors of VO2. Back PAC was the least variable. Hip skinfold thickness explained 15% additional variance inVO2 to PAC with reduced standard error. CONCLUSION: The lower-back is a more suitable accelerometer placement for young, active females during treadmill exercise.
Authors:
Fleur Elizabeth Horner; Joanna Slade; James L Bilzon
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-12-3
Journal Detail:
Title:  Journal of physical activity & health     Volume:  -     ISSN:  1543-5474     ISO Abbreviation:  J Phys Act Health     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2012-12-10     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101189457     Medline TA:  J Phys Act Health     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Department for Health, University of Bath, Bath, Somerset, United Kingdom.
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