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Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 1,111
Online ISSN 1827-1928
Yano T., Yunoki T., Horiuchi M.
From the Laboratory of Human Movement Science Faculty of Education, Hokkaido University, Japan
Background. The purpose of the present study was to examine the kinetics of oxygen uptake (V.O2) during decremental ramp exercises after incremental ramp exercise above the anaerobic threshold.
Methods. Triangle exercise consisting of incremental and decremental exercises, and trapezoid exercise in which a constant load was inserted between incremental and decremental exercises were carried out.
Results. Blood lactate (La) increased in incremental phases during triangle and trapezoid exercises, and showed a further increase at constant work during trapezoid exercise. It significantly decreased during decremental exercise. Initial V.O2 level during decremental exercise was significantly higher in trapezoid exercise than in triangle exercise. The V.O2 level then exponentially decreased and later showed a linear decrease during both exercises. These V.O2 kinetics were expressed by an approximate equation. The time constant expressing the exponential manner was about one minute on average in both exercises. The slope of the linearly decreasing phase of V.O2 was significantly related to La at 100 watts during the decremental exercise.
Conclusions. V.O2 kinetics during decremental exercise after incremental exercise above the anaerobic threshold consists of at least three components: initial level, exponentially decreasing phase, and linearly decreasing phase.