Abstract
Analysis of mitochondrial respiration function represented by the oxygen consumption rate is necessary for assessing mitochondrial respiration function. This protocol describes steps to evaluate the respiration function of mitochondria in situ in saponin-permeabilized cardiomyocytes. In permeabilized cells, mitochondria are in a relatively integrated cellular system, and mitochondrial respiration is more physiologically relevant than isolated mitochondria. For complete details on the use and execution of this protocol, please refer to Gong et al. (2015a) and Gong et al. (2015b).