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J Appl Physiol 88: 1812-1819, 2000;
8750-7587/00 $5.00
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Vol. 88, Issue 5, 1812-1819, May 2000

Kinetics of oxygen uptake at the onset of exercise near or above peak oxygen uptake

R. L. Hughson1, D. D. O'Leary1, A. C. Betik1, and H. Hebestreit2

1 Department of Kinesiology, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1; and 2 Universitäts-Kinderklinik, 97080 Würzburg, Germany

We tested the hypothesis that kinetics of O2 uptake (VO2) measured in the transition to exercise near or above peak VO2 (VO2 peak) would be slower than those for subventilatory threshold exercise. Eight healthy young men exercised at ~57, ~96, and ~125% VO2 peak. Data were fit by a two- or three-component exponential model and with a semilogarithmic transformation that tested the difference between required VO2 and measured VO2. With the exponential model, phase 2 kinetics appeared to be faster at 125% VO2 peak [time constant (tau 2) = 16.3 ± 8.8 (SE) s] than at 57% VO2 peak (tau 2 = 29.4 ± 4.0 s) but were not different from that at 96% VO2 peak exercise (tau 2 = 22.1 ± 2.1 s). VO2 at the completion of phase 2 was 77 and 80% VO2 peak in tests predicted to require 96 and 125% VO2 peak. When VO2 kinetics were calculated with the semilogarithmic model, the estimated tau 2 at 96% VO2 peak (49.7 ± 5.1 s) and 125% VO2 peak (40.2 ± 5.1 s) were slower than with the exponential model. These results are consistent with our hypothesis and with a model in which the cardiovascular system is compromised during very heavy exercise.

maximal oxygen uptake; ventilatory threshold; breath-by-breath; anaerobic metabolism; cardiovascular control; feedback; mathematical modeling


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