| The
present study intended to verify if the inclusion of intensities above
lactate threshold (LT) in the VO2/running speed regression
(RSR) affects the estimation error of accumulated oxygen deficit (AOD)
during a treadmill running performed by endurance-trained subjects.
Fourteen male endurance-trained runners performed a sub maximal treadmill
running test followed by an exhaustive supra maximal test 48h later.
The total energy demand (TED) and the AOD during the supra maximal
test were calculated from the RSR established on first testing. For
those purposes two regressions were used: a complete regression (CR)
including all available sub maximal VO2 measurements and
a sub threshold regression (STR) including solely the VO2
values measured during exercise intensities below LT. TED mean values
obtained with CR and STR were not significantly different under the
two conditions of analysis (177.71 ± 5.99 and 174.03 ± 6.53 ml·kg-1,
respectively). Also the mean values of AOD obtained with CR and STR
did not differ under the two conditions (49.75 ± 8.38 and 45.8 9 ±
9.79 ml·kg-1, respectively). Moreover, the precision of
those estimations was also similar under the two procedures. The mean
error for TED estimation was 3.27 ± 1.58 and 3.41 ± 1.85 ml·kg-1
(for CR and STR, respectively) and the mean error for AOD estimation
was 5.03 ± 0.32 and 5.14 ± 0.35 ml·kg-1 (for CR and STR,
respectively). The results indicated that the inclusion of exercise
intensities above LT in the RSR does not improve the precision of
the AOD estimation in endurance-trained runners. However, the use
of STR may induce an underestimation of AOD comparatively to the use
of CR.
KEY
WORDS: Methodology, linear regression, estimation error, lactate
threshold.
|
