MATRIX ANALYSIS OF ECG PARAMETERS MAY BE A WAY TO IMPROVE QUALITY OF FUNCTIONAL STATE MONITORING DURING EXERCISING. - Poderys, Jonas; Bikulčienė, Liepa; Trinkūnas, Eugenijus; Poderienė, Kristina; Buliuolis, Alfonsas; Vainoras, Alfonsas (Baltic Journal of Sport & Health Sciences, 2015)