Comparison of Internal Load in Young Swimmers and Basketball Players During a Single Training Session: Rating of Perceived Exertion Versus Changes in Salivary Biomarkers. - Grzesiak-Gasek, Iwona; Michalik, Kamil; Domaradzki, Jarosław; Colinso, Bartosz Bogusz; Popowczak, Marek (Applied Sciences (2076-3417), 2026)