A measuring method enables the strength of the ischiocavernosus muscles (IC) causing the rigidity of the penis (P) of a patient and the arterial and venous variation ensuring the erection of the penis (P) of the patient to be measured and reinforced by placing a sensor (2, 50) around the penis (P) includes elements to receive the intracavernous pressure (ICP) and pressure variations of the penis (P), and at least one transducer (21, 55) integrated into or offset from the sensor (2, 50) allowing the pressure signal from the elements for receiving the pressure to be transformed into an electrical signal, and by connecting the sensor (2, 50) to a housing (35) including elements for amplifying and recording the signal from the transducer (21, 55), elements for analyzing the signal by a microcontroller allowing the fatigue state of the ischiocavernosus muscles (IC) to be measured and the variations in muscle strength of the ischiocavernosus muscles (IC) to be measured.
