Document Detail


Examination of oxygen uptake kinetics in decremental load exercise by a numerical computation model.
MedLine Citation:
PMID:  18838840     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The purpose of this study was to establish a numerical computation model for estimation of oxygen uptake (V(.)O2) kinetics in decremental load exercise (DLE) starting from a work rate (WR) above the ventilatory threshold (>VT). In the model, WR in DLE were separated into several steps (constant load exercise, CLE) of which the durations increased step by step. V(.)O2 kinetics in each step was estimated using an exponential equation, and the sum of VO2 values from all steps at a given time was regarded as simulated V(.)O2 in DLE. In the model, the time constants were set symmetrically in a step <VT and asymmetrically in a step >VT at onset and offset (tau(off)) of exercise. As a result, simulated V(.)O2 qualitatively, but not quantitatively, approximated measured V(.)O2. Consequently, we incorporated a new model in which a step >VT was subdivided into several parts. Although there was a slight difference quantitatively, the interval of subdivision of 3.0 min and tau(off) of 2.8 min allowed for qualitative approximation. The numerical computation model adopted in this study is useful for estimation of V(.)O2 kinetics during DLE starting from high intensity (>VT).
Authors:
Takuma Arimitsu; Ryouta Matsuura; Takehide Kimura; Takahiro Yunoki; Tokuo Yano
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of physiological anthropology     Volume:  27     ISSN:  1880-6805     ISO Abbreviation:  -     Publication Date:  2008 Sep 
Date Detail:
Created Date:  2008-10-07     Completed Date:  2008-12-31     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101269653     Medline TA:  J Physiol Anthropol     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  247-54     Citation Subset:  IM    
Affiliation:
Laboratory of Exercise Physiology, Health and Sport Education, Graduate School of Education, Hokkaido University. arimitsu@edu.hokudai.ac.jp
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MeSH Terms
Descriptor/Qualifier:
Adult
Computer Simulation
Exercise / physiology*
Humans
Kinetics
Male
Models, Biological*
Muscle, Skeletal / physiology
Oxygen Consumption / physiology*
Respiration

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