Influence of Posture on Respiratory Function and Respiratory Muscle Strength in Normal Subjects

Abstract

Abstract.[Purpose] The purpose of this study was to compare the respiratory function and respiratory muscle strength in the different body positions in order to find the posture in which it is easiest to cough up secretions or endotracheal aspirate.[Subjects] Fifteen non-smoking healthy women participated. All subjects gave their written consent to the study. [Methods] We measured respiratory muscle strength and respiratory function in three postures: sitting, supine, and 45 degree rotative prone.[Results] Vital capacity, forced vital capacity, forced expiratory volume in one second, and peak expiratory flow were marginally lower in 45 degree rotative prone. Percent of forced expiratory volume in one second was significantly lower in supine compared with sitting (p<0.05).[Conclusion] Our results suggest that 45 degree rotative prone is effective for coughing up secretions and endotracheal aspirate as well as the sitting position in young female subjects.

Influence of different body positions in vital capacity in patients on postoperative upper abdominal

“…14---17 This finding may be related to the favorability of deep breaths in this posture, and overcomes the tendency to airway closure related to changes in lung compliance and lower pressure of the abdominal organs in relation to the diaphragm. 18 The upright position showed the highest increases in FVC. A similar finding was reported by other authors who suggest that the upright position provides greater mechanical advantage to the respiratory muscles, as abdominal contents do not interfere with diaphragm displacement and, thus, generates higher ventilation pressures.…”

Effect of Body Positions on Lungs Volume in Asthmatic Patients: A Cross-sectional Study

“…The different body positions have influenced on the lungs volume and muscle length-tension relationship. These factors have the effect on the mean expiratory pressure and peak expiratory flow [4][5][6].…”

Measurement of Changes in Chest Mobility and Pulmonary Functions in Relation to Stroke Patients’ Positions

“…In our review of previous studies of respiratory functions in relation to position, we found that studies have been conducted on normal subjects 9,10) , cerebral palsy patients 11) , and spinal cord injury patients 12,13) . However, objective data on changes in the chest mobility and pulmonary function of stroke patients in relation to changes in position are scarce.…”