Dosage effect of induced alkalosis on anaerobic intermittent cycle performance of moderately trained women
Schauf, Mary A.
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Twelve moderately trained females (mean V̇O₂ [sub peak] = 40.02 ml·kg⁻¹·min⁻¹) participated in identical exercise tests after ingestion of .1 g·kg⁻¹ body weight (BW) of NaHCO₃, .2 g·kg⁻¹ BW of NaHCO₃, or a CaCO₃ placebo. Subjects exercised for 5 min at both 30% V̇O₂ [sub peak] and 50% V̇O₂ [sub peak], followed immediately by 1-min bouts at 110% V̇O₂ [sub peak], spaced with 1-min passive rest periods. Intervals were continued to volitional fatigue. Mean total exercise times to exhaustion during the 110% exercise bouts were 133.9 ± 83.3 s, 162.4 ± 107.3 s, and 129.4 ± 104 s; mean change in blood lactate from preexercise to 5 min postexercise were 9.83 ± 1.76 mmol·L⁻¹, 10.9 ± 2.04 mmol ± L⁻¹, and 10.9 ± 3.18 mmol·L⁻¹; mean rate of perceived exertion (RPE) ratings were 8.4 ± 1.4, 8.7 ± 1.1, and 8.7 ± 1.1, respectively, for .1 g·kg⁻¹ BW NaHCO₃, .2 g·kg⁻¹ BW NaHCO₃, and the placebo. Repeated measures ANOVA revealed significant differences (p̲ < .05) in the mean exercise times, but no significant differences for RPE or blood lactate. Tukey HSD post hoc analysis revealed that subjects exercised significantly longer following ingestion of .2 g·kg⁻¹ BW, as compared to both .1 g·kg⁻¹ BW and placebo conditions. The findings of this study show that a NaHCO₃ dosage of .2 g·kg⁻¹ BW is effective in improving performance during short-duration, high- intensity work for moderately trained females.