title: Instantaneous changes in respiratory function induced by passive pelvic suspension in the supine position in relation to increased diaphragm excursion.
abstract: [Purpose] This study aimed to introduce an approach of pelvic suspension (PS) using sling cords and to obtain evidence for changes in respiratory function of healthy subjects. [Subjects and Methods] Subjects were 25 healthy men. In the supine position, with hip and knee joints flexed at 90°, the subjects' pelvises were suspended with sling belts. Diaphragm excursion, respiratory function, and respiratory comfort in these postures were measured using ultrasonography, respirometry, and visual analog scale (VAS), respectively. [Results] When the pelvis was passively suspended with sling cords, the diaphragm moved 5 mm cranially and diaphragm excursion showed an instantaneous increase compared with the control. The tidal volume (VT) showed an increase and the respiration rate (RR) showed a decrease. The extent of diaphragm excursion was correlated with changes inVTunder the control and PS conditions. Independent measurements of pulmonary function revealed that PS reduced the expiratory reserve volume, being correlated positively and negatively to increases in vital and inspiratory capacities, respectively. Furthermore, VAS values for respiratory ease were greater with PS than with the control. [Conclusion] These results suggest that PS effectively changed diaphragm excursion and respiratory function, leading to ease of breathing (i.e., deep and slow respiration).
authors.affiliation: Department of Physiology, Graduate School of Medicine, Tokyo Medical University, Japan; Department of Rehabilitation, IMS group I-Tower Clinic, Japan.
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Ishizuka
authors.affiliation: Department of Anatomy, Graduate School of Medicine, Tokyo Medical University, Japan; Department of Rehabilitation, Sonoda Second Hospital, Japan.
authors.forename: Naoya
authors.initials: N
authors.lastname: Nishida
authors.affiliation: Department of Physiology, Graduate School of Medicine, Showa University, Japan; Department of Rehabilitation, IMS group Clover no Sato IMS Care Kaupili Itabashi, Japan.
authors.forename: Yuuki
authors.initials: Y
authors.lastname: Homma
authors.affiliation: Department of Physiology, Graduate School of Medicine, Showa University, Japan; Department of Rehabilitation, Hiroo Orthopedics, Japan.
authors.forename: Tetsuro
authors.initials: T
authors.lastname: Hirayama
authors.affiliation: Graduate School of Health Care Sciences, Bunkyo Gakuin University, Japan.
authors.forename: Yukisato
authors.initials: Y
authors.lastname: Ishida
authors.affiliation: Graduate School of Health Care Sciences, Bunkyo Gakuin University, Japan.
authors.forename: Fujiyasu
authors.initials: F
authors.lastname: Kakizaki
authors.affiliation: Department of Physiology, Graduate School of Medicine, Tokyo Medical University, Japan.
authors.forename: Masato
authors.initials: M
authors.lastname: Konishi
keywords: Diaphragm excursion; Pelvic suspension; Respiration function