A PHYSICAL THEORY OF ACID ANION DISPLACEMENT AND RECOVERY FOLLOWING EXERCISE.

Area of Science:

• Physiology
• Biophysics
• Computational Biology

Background:

• Exercise induces changes in blood bicarbonate ion concentration.
• Understanding anion dynamics is crucial for exercise physiology.

Purpose of the Study:

• To develop a theoretical model predicting bicarbonate ion concentration post-exercise.
• To evaluate constants for anion concentration in muscle, blood plasma, and removal cells.
• To estimate anion permeability between cellular compartments.

Main Methods:

• A simple theoretical model was developed.
• Rational equations were used to describe anion concentrations.
• Experimental data from 23 exercise experiments were analyzed.
• Mathematical analysis was employed to estimate permeability constants.

Main Results:

• The theoretical model's behavior closely matched observed bicarbonate ion concentration variations in blood plasma.
• Agreement between theoretical predictions and experimental data was high.
• Permeability values for acid anions were estimated between muscle cells and blood (75 x 10^-5 cm/sec) and blood plasma and removal cells (5.9 x 10^-5 cm/sec).

Conclusions:

• The theoretical model effectively simulates post-exercise bicarbonate ion dynamics.
• The study provides quantitative estimates for anion permeability, contributing to exercise physiology models.
• This work enhances the understanding of acid-base balance during physical exertion.