PROBLEM TO BE SOLVED: To provide an apparatus of modulating the brain's intrinsic respiratory activity to affect both aspects of respiration.SOLUTION: There is provided means for treating breathing disorders by stimulating respiratory muscles or respiratory nerves to modulate respiratory systems while leaving respiratory drive intact. Embodiments employ frequency analysis to determine whether appropriate stimulation energy is being applied. A method comprises: A. defining a measured frequency zone on the basis of measured physiological signals associated with the intrinsic contraction of a muscle; B. defining a stimulation frequency zone on the basis of stimulation frequency of an electrical pulse generator configured to stimulate the muscle or a nerve associated with the muscle at a different frequency than the intrinsic frequency; C. stimulating the muscle or nerve associated with the muscle; and D. determining the impact of stimulation by comparing the measured power of an array of signals that fall within the measured frequency zone to the measured power of the array of signals that fall within the stimulation frequency zone.
RESPIRATORY RECTIFICATION