Figure 3.

Diaphragmatic contribution to the inspiratory effort produced to trigger the cervical magnetic stimulation (Pga/Pdi, with Pga: gastric pressure and Pdi: transdiaphragmatic pressure) during a voluntary effort, a non-volitional “single-breath” effort in response to the first presentation of an infinite resistance, and a non-volitional “continuous” effort, 10 breathing cycles after application of an inspiratory threshold load. Each point represents the mean value of Pga/Pdi in one subject, irrespective of the intensity of the underlying effort. The horizontal lines depict the group mean value.