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O2
kinetics in heavy submaximal exercise by hyperoxia and prior
high-intensity exercise
1 Department of Kinesiology, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1; and 2 Department of Physical Education, Odense University, Odense DK-5230, Denmark
Received 24 September 1996; accepted in final form 11 June 1997.
MacDonald, Maureen, Preben K. Pedersen, and Richard L. Hughson. Acceleration of
O2 kinetics in heavy
submaximal exercise by hyperoxia and prior high-intensity exercise.
J. Appl. Physiol. 83(4):
1318-1325, 1997.
We examined the hypothesis that
O2 uptake (O2) would
change more rapidly at the onset of step work rate transitions in
exercise with hyperoxic gas breathing and after prior high-intensity
exercise. The kinetics of
O2 were determined from the
mean response time (MRT; time to 63% of total change in
O2) and
calculations of O2 deficit and
slow component during normoxic and hyperoxic gas breathing in one group
of seven subjects during exercise below and above ventilatory threshold
(VT) and in another group of seven subjects during exercise above VT
with and without prior high-intensity exercise. In exercise transitions below VT, hyperoxic gas breathing did not affect the kinetic response of O2 at the
onset or end of exercise. At work rates above VT, hyperoxic gas
breathing accelerated both the on- and off-transient MRT, reduced the
O2 deficit, and decreased the
O2 slow component from
minute 3 to minute
6 of exercise, compared with normoxia. Prior exercise
above VT accelerated the on-transient MRT and reduced the
O2 slow component from
minute 3 to minute
6 of exercise in a second bout of exercise with both
normoxic and hyperoxic gas breathing. However, the summated
O2 deficit in the second normoxic
and hyperoxic steps was not different from that of the first steps in
the same gas condition. Faster on-transient responses in exercise
above, but not below, VT with hyperoxia and, to a lesser degree, after
prior high-intensity exercise above VT support the theory of an
O2 transport limitation at the
onset of exercise for workloads >VT.
ventilatory threshold; oxygen transport; oxygen utilization; oxygen deficit; oxygen debt
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