Method for measuring one or more diaphragmatic functional parameters of a diaphragm of a human or an animal among a contractility and/or a diaphragmatic pressure and/or a diaphragm function and/or diaphragm effort and/or a diaphragmatic work and/or an identification of the spatial organization of muscle fascicule(s), said method comprising the steps consisting of: - a) a stimulation step by which a stimulation of the diaphragm is provided to generate a movement of one or more parts of the diaphragm, said stimulation step does not comprise assisted ventilation or life support, - b) during the movement of said one or more parts of the diaphragm, imaging one or more parts of the diaphragm over time through an imaging step comprising the steps of: • emitting at least 100 unfocused ultrasound waves per second towards a region of the human or the animal comprising the one or more parts of the diaphragm to be imaged during the imaging step, • detecting ultrasound waves reflected and/or scattered by organic tissues of the human or the animal located in the region, • processing the reflected and/or scattered ultrasound waves over time to generate images by technical means, - c) processing, by technical means, images previously acquired during the imaging step to measure: • one or more movements of a given part of the diaphragm over time, and/or • a propagation of a movement from said one or more parts of the diaphragm to one or more adjacent parts over time, and/or • a propagation speed of a movement from said one or more parts of the diaphragm to one or more adjacent parts over time, and/or • one or more movements of different parts of the diaphragm over time, and/or • an amplitude of a movement of one or different parts of the diaphragm over time - d) based on one or more measurements of the processing step, determining, by technical means, one or more functional parameters of the diaphragm from a linear relation between one of the parameters measured at step c) being indicative of movement of one or more parts of the diaphragm and the considered functional parameter. - a) a stimulation step by which a stimulation of the diaphragm is provided to generate a movement of one or more parts of the diaphragm, said stimulation step does not comprise assisted ventilation or life support, - b) during the movement of said one or more parts of the diaphragm, imaging one or more parts of the diaphragm over time through an imaging step comprising the steps of: • emitting at least 100 unfocused ultrasound waves per second towards a region of the human or the animal comprising the one or more parts of the diaphragm to be imaged during the imaging step, • detecting ultrasound waves reflected and/or scattered by organic tissues of the human or the animal located in the region, • processing the reflected and/or scattered ultrasound waves over time to generate images by technical means, • emitting at least 100 unfocused ultrasound waves per second towards a region of the human or the animal comprising the one or more parts of the diaphragm to be imaged during the imaging step, • detecting ultrasound waves reflected and/or scattered by organic tissues of the human or the animal located in the region, • processing the reflected and/or scattered ultrasound waves over time to generate images by technical means, - c) processing, by technical means, images previously acquired during the imaging step to measure: • one or more movements of a given part of the diaphragm over time, and/or • a propagation of a movement from said one or more parts of the diaphragm to one or more adjacent parts over time, and/or • a propagation speed of a movement from said one or more parts of the diaphragm to one or more adjacent parts over time, and/or • one or more movements of different parts of the diaphragm over time, and/or • an amplitude of a movement of one or different parts of the diaphragm over time • one or more movements of a given part of the diaphragm over time, and/or • a propagation of a movement from said one or more parts of the diaphragm to one or more adjacent parts over time, and/or • a propagation speed of a movement from said one or more parts of the diaphragm to one or more adjacent parts over time, and/or • one or more movements of different parts of the diaphragm over time, and/or • an amplitude of a movement of one or different parts of the diaphragm over time - d) based on one or more measurements of the processing step, determining, by technical means, one or more functional parameters of the diaphragm from a linear relation between one of the parameters measured at step c) being indicative of movement of one or more parts of the diaphragm and the considered functional parameter.