Electrophysiological measures and well-being assessment
CAVITY
Three electrophysiological measures were recorded before and after each intervention and control, directly inside the MRI scanner, without moving the volunteer: the respiratory rate, the heart rate and the oxygen saturation.Subjective well-being was assessed using a short-form of four questions rated with a Likert-scale from 1 to 7 (1 being “totally agree” and 7 being “not agree at all”). The questions were: (1) I feel nervous or stressed; (2) I feel relaxed; (3) I have a feeling of pressure in the thoracic cavity; and (4) My breathing is fluid. Total score was calculated by sum of each question score, with an inversion score for questions 2 and 4. Higher is the total score of subjective well-being, better feels the volunteer.