Objective To study the modulation activities of thiol oxidants such as naphthoquinon (NQ) and selenium compound (Se) on skeletal muscle type ryanodine receptor (RyR1)/Ca2+ release channel to reveal the effects of superoxide thiols on RyR1 in the redox mechanism. Methods The isolated rabbit skeletal muscle SR vesicles were used in this research. The generated amount of O·-2 and its [3H]-ryanodine binding, Ca2+ flux from SR vesicles, the redox potential Eryr of RyR1, single channel activity in bi-layer membra...