[Relation between inter- and intracellular action potentials of frog isolates muscle fiber at various temperatures].

Extra- and intracellular action potentials (AP) of isolated muscle fibres plunged into volume conductor were studied at different temperatures. Changes of the first and second AP derivatives and their temperature dependence were described. The changes are explained by temperature effect on the density of input and output ion currents.

Relations between the shapes of different muscle potentials. Experimental and model investigations.

Intracellular muscle action potentials, the corresponding to them extracellular action potentials recorded at short and long radial distances, extraterritorial motor unit potentials, evoked muscle potentials (M-, H- and T-potentials) and averaged potentials of the summated electromyogram were studied experimentally and compared with the calculated potentials. The similarity in the shape of the different muscle potentials and some second-rate differences were explained taking into account the point of recording, the different degree of desynchronization of the summated potentials and some other factors.