Oxygen Uptake Kinetics in Severe Intensity Exercise Page: 11
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therefore, it can be reasonably well approximated by the simpler procedure of fitting a
single T to the response data. It was found that kinetics showed a mild dependence on
WR at intensities below the LAT (i.e., moderate intensity exercise). The kinetics at high
WR's are well characterized by the addition of a slower exponential component to the
faster component that is seen in lower WR's. Although not explicitly stated, examination
of their data suggests that each participant had, at most, only one test in the severe
domain. Thus, the implication is that kinetics are slower in heavy than moderate, and
slower still in severe than heavy, but no conclusions can be drawn regarding the effect of
intensity with the severe domain.
Barstow and Mole (1991) tested 4 trained cyclists during transitions from 33 W to
WR's throughout all three domains (38, 54, 85, and 100% of VO2max). In every case,
three phases (Phases I, II, and III) of the VO2 response could be identified. VO2 during
Phase II was fit by one of two models: (1) a double-exponential where both terms begin
together close to the start of Phase II, and (2) a double-exponential where each of the
exponential terms begins independently with separate TD's. For the two lighter WR's, the
double-exponential regression reduced to a single value for T, indicating a mono-
exponential response. For the heaviest WR's, the second model produced a significantly
better fit to the responses with a mean TD for the slow component of 105 + 46 s. The time
constant of the fast component exhibited no significant change as WR increased. This
better fit of the second model to the responses implies that the second component does
not begin coincident with the first, i.e., soon after exercise onset, but rather, later into the
exercise period.11
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Blumoff, Sonja. Oxygen Uptake Kinetics in Severe Intensity Exercise, thesis, May 2000; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc2539/m1/16/: accessed May 3, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .