Metabolic alkalosis, recovery and sprint performance

Area of Science:

• Exercise Physiology
• Sports Science
• Biochemistry

Background:

• Pre-exercise alkalosis and active recovery independently enhance recovery post-exercise through distinct mechanisms.
• Combining these strategies may offer synergistic benefits for acid-base balance restoration.
• High-intensity exercise leads to metabolic acidosis, impacting performance.

Purpose of the Study:

• To investigate the combined effects of pre-exercise sodium bicarbonate (NaHCO3) and active recovery on physiological recovery and performance during repeated high-intensity exercise bouts.
• To determine if this combined intervention yields superior outcomes compared to placebo or individual interventions.

Main Methods:

• Nine subjects completed four randomized trials: Placebo Active (PLAC A), NaHCO3 Active (BICARB A), Placebo Passive (PLAC P), and NaHCO3 Passive (BICARB P).
• Each trial involved three 30-second maximal efforts interspersed with 3-minute recovery periods.
• Blood pH and bicarbonate (HCO3-) levels were measured to assess acid-base status.

Main Results:

• Pre-exercise alkalosis was confirmed in NaHCO3 conditions, showing significantly higher pH and HCO3- levels compared to placebo.
• Average speed was significantly higher in the BICARB A condition (3.9 ± 0.3 m·s-1) compared to other trials.
• Total distance covered showed a significant difference, with BICARB A outperforming PLAC P.

Conclusions:

• Supplementation with sodium bicarbonate (NaHCO3) combined with active recovery improves performance in successive 30-second high-intensity exercise bouts.
• This intervention enhances blood acid-base recovery, contributing to improved physiological state and exercise output.
• The findings suggest a practical nutritional strategy for athletes engaged in high-intensity, intermittent sports.