A method and system for opening a blood-brain barrier are described. A surface of the fabric is provided with a flame-retardant layer applied by coating the flame-retardant directly onto the fabric surface. The oscillator’s ability to oscillate is controlled by the one or more variable impedance or gain devices. The processing means receives and processes the movement signals to derive a classification of individual breaths using, for each breath, the respective phase andor amplitude of each movement sensor signal within the set for that breath.