The invention relates to a system for assessing and monitoring muscle performance with self-adjusting feedback, in order to evaluate progress in physiotherapy received by patients who have suffered muscle damage, characterised in that it comprises: A) at least one apparatus used for acquiring muscle or biopotential signals, for conditioning the signals, for processing, sending and receiving information, and for self-adjusting feedback; B) at least one external computer and/or monitor or graphic interface for viewing external information; C) wherein said at least one apparatus for acquiring the muscle or biopotential signals, for conditioning the signals, for processing, sending and receiving information, and for self-adjusting feedback and said at least one external computer and/or monitor or graphic interface for viewing the external information are configured to carry out a method for measuring, extracting and processing parameters for assessing and monitoring muscle performance with self-adjusting feedback, in order to evaluate progress in physiotherapy received by patients who have suffered muscle damage.La invención se refiere un sistema para la evaluación y seguimiento del rendimiento muscular con retroalimentación autoajustable para valorar la evolución de una fisioterapia que reciben pacientes que ha sufrido daños musculares, caracterizado por que consta de: A) al menos un aparato para la adquisición de señales musculares o biopotenciales; acondicionamiento de las señales; procesamiento, envío, recepción de la información; y retroalimentación autoajustable; B) al menos un aparato de computo externo y/o monitor o interfaz gráfica para la visualización de la información externa; C) en donde dicho al menos un aparato para la adquisición de las señales musculares o biopotenciales; acondicionamiento de las señales; procesamiento, envío, recepción de la información; y retroalimentación autoajustable y dicho al menos un aparato de cómputo externo y/o monitor o inte