Localization of Potassium (42K) and Rubidium (86Rb) in Muscle

The results of an investigation of the muscular tissue radioactivity after the administration of radioactive potassium and rubidium is presented. The experiments were carried out in 2 groups of rats, 35 for each tested isotope. The isotope concentrations in the muscle insertions and muscle bellies were determined. A marked increase of activity in the muscular insertion samples was noted (50 to 100%). In addition, different accumulation of isotopes was noted in 2 different types of muscles. The results are to serve as an introduction into the investigation of denervated muscle electrolyte metabolism.