Abstract
BACKGROUND:
Although several studies have focused on maximal O
2
uptake ([Formula: see text] O
2max
) measured by a verification phase following the determination of peak O
2
uptake ([Formula: see text] O
2peak
) by a graded exercise test, an explanation for the underlying mechanisms of the difference between[Formula: see text] O
2peak
and confirmed [Formula: see text] O
2max
is scant.
OBJECTIVE:
To explore the hypothesis that when the difference between [Formula: see text] O
2peak
and [Formula: see text] O
2max
(Δ[Formula: see text] O
2
) increases, the gap between peak stroke volume (SV
peak
) and SV level corresponding to [Formula: see text] O
2peak
velocities (Δ SV) grows.
METHODS:
Nine moderately to well-trained male athletes([Formula: see text] O
2max
: 60.2 ± 7 mL ⋅ min
-1
⋅ kg
-1
) volunteered to take part in the study. Following familiarization session, volunteers were asked to perform submaximal and maximal graded exercise tests. Then, constant-loading SV
peak
tests (using wattages in a range from 40-100% of [Formula: see text] O
2peak
) and verification phase (using wattages corresponding with 100-110% of [Formula: see text] O
2peak
) were conducted in a climatic chamber.
RESULTS:
The Δ[Formula: see text] O
2
was well correlated withΔ SV (Pearson r= 0.89; p≤ 0.001). The mean SV
peak
of participants corresponded to 60.3 ± 18% of [Formula: see text] O
2peak
.[Formula: see text] O
2max
was significantly greater (11.2%) than [Formula: see text] O
2peak
(60.2 ± 7 vs. 54.2 ± 8.1 mL ⋅ min
-1
⋅ kg
-1
) (p ≤ 0.01).
CONCLUSIONS:
[Formula: see text] O
2peak
and [Formula: see text] O
2max
differences may be related to the gap between SV
peak
and SV at [Formula: see text] O
2peak
.