Effect of Sodium Bicarbonate and Glycogen Depletion on 1500n1 Time Trials
Abstract
Previous studies have demonstrated the importance of anaerobic capacity to
performance during high intensity exercise. Competitive cyclists/skaters (N =
9) performed three randomly ordered control (C), sodium bicarbonate (SB),
glycogen depletion (GD) 1500m cycling time trials. Power output was
recorded using a strain gauge interfaced with a windload simulator attached to
a racing bicycle. VO2 was measured by open circuit spirometry. Power output
and V02 were linked based on steady state exercise completed before the
trials. Repeated measures ANOVA analyzed the outcomes. The GD trial took
significantly longer than the C or SB trials ((333.96, SB133.49, &
GD137.73~p) < .05. Mean total and anaerobic power output during the last
200m segment was significantly greater in SB compared to GD (C42879,
SB44956 & GD40642 J), and (C20189, SB22194 & GD18741 J), but not for
aerobic work (C22683, SB22762 & GD21901 J). The results support the
hypothesis of augmenting anaerobic capacity during the sodium bicarbonate
trial and reducing anaerobic capacity with glycogen depletion.
Subject
Cycling - Physiological aspects
Glycogen - Metabolism
Sodium bicarbonate - Physiological effect