Validation of the Polar Fitness Test for Estimation of Maximal Oxygen Consumption at Rest in Medically Supervised Exercise Training: Comparison with CPET and the 6-Minute Walk Test †. - Neudorfer, Michael; Ötzlinger, Lukas; Kumar, Devender; Niebauer, Josef; Smeddinck, Jan David; Sareban, Mahdi; Treff, Gunnar (Sensors (14248220), 2025)