Document Detail

Acceleration versus heart rate for estimating energy expenditure and speed during locomotion in animals: tests with an easy model species, Homo sapiens.
MedLine Citation:
PMID:  18375107     Owner:  NLM     Status:  MEDLINE    
An important element in the measurement of energy budgets of free-living animals is the estimation of energy costs during locomotion. Using humans as a particularly tractable model species, we conducted treadmill experiments to test the validity of tri-axial accelerometry loggers, designed for use with animals in the field, to estimate rate of oxygen consumption (VO2: an indirect measure of metabolic rate) and speed during locomotion. The predictive power of overall dynamic body acceleration (ODBA) obtained from loggers attached to different parts of the body was compared to that of heart rate (fH). When subject identity was included in the statistical analysis, ODBA was a good, though slightly poorer, predictor of VO2 and speed during locomotion on the flat (mean of two-part regressions: R2=0.91 and 0.91, from a logger placed on the neck) and VO2 during gradient walking (single regression: R2=0.77 from a logger placed on the upper back) than was fH (R2=0.96, 0.94, 0.86, respectively). For locomotion on the flat, ODBA was still a good predictor when subject identity was replaced by subject mass and height (morphometrics typically obtainable from animals in the field; R2=0.92 and 0.89) and a slightly better overall predictor than fH (R2=0.92 and 0.85). For gradient walking, ODBA predicted VO2 more accurately than before (R2=0.83) and considerably better than did fH (R2=0.77). ODBA and fH combined were the most powerful predictor of VO2 and speed during locomotion. However, ODBA alone appears to be a good predictor and suitable for use in the field in particular, given that accelerometry traces also provide information on the timing, frequency and duration of locomotion events, and also the gait being used.
Lewis G Halsey; Emily L C Shepard; Carl J Hulston; Michelle C Venables; Craig R White; Asker E Jeukendrup; Rory P Wilson
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Publication Detail:
Type:  Journal Article     Date:  2008-03-28
Journal Detail:
Title:  Zoology (Jena, Germany)     Volume:  111     ISSN:  0944-2006     ISO Abbreviation:  Zoology (Jena)     Publication Date:  2008  
Date Detail:
Created Date:  2008-04-09     Completed Date:  2008-07-17     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9435608     Medline TA:  Zoology (Jena)     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  231-41     Citation Subset:  IM    
School of Biosciences, Centre for Ornithology, University of Birmingham, Edgbaston B15 2TT, UK.
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MeSH Terms
Energy Metabolism / physiology*
Heart Rate / physiology*
Locomotion / physiology*
Monitoring, Physiologic / instrumentation,  methods,  veterinary
Oxygen Consumption / physiology*
Predictive Value of Tests

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

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