TY JOUR TI Towards a mathematical theory of athletic training. Part 1. The mathematical model of the training process and the equation of athletic performance by Nikolai Nikolaevich Engwer KW mathematical modeling of the training process KW equation of athletic performance KW volume of training load KW intensity of training load KW body adaptation to load JO Russian Journal of Information Technology in Sports AU Timme, E.A. PY 2025 IS PB Russian Association of Computer Science in Sport