Decreased lung capacity caused by the poor posture of thoracic kyphosis puts in increased stress on the heart and can cause heart disease, such as cor pulmonale. Body position has shown to affect lung volumes [3] and muscle biomechanics [4]. Lung elastance and resistance increase in the supine posture. The effects of posture on the mechanics of the respiratory system are not well known, particularly in terms of total respiratory resistance. LCI is calculated using the FRC and several authors have shown that LCI can be affected by large changes in lung volumes [ 7 – 9 ]. yielded power 0.90. In particular, a reduction in FRC when lying supine compared to an upright posture is widely reported [ 6 ]. The sequence of body positions had no effect on any of our results indicating that all changes in lung volumes and regional asynchronous ventilation c;n be reversed by placing the horse in the prone posture. Agostoni E, Mead J. Statics of the respiratory system. Associated with these changes was a significant increase of the functional residual capacity by 636 ml. 97, No. Results: Overall, lung volumes were higher in the prone position throughout the study period; there was no significant effect of PMA on lung volumes. Peak expiratory flow rate has been used as surrogate measure of cough and huff strength [5]. Body positioning may contribute to increase lung volume and partial verticalization is simple to perform. The clinical implications of these findings are discussed and recommendations made for the use of positioning to optimise gas exchange in the post-operative patient. Ventilation did not change significantly from that found during sitting, unlike the findings associated with the supine position, in which position the tidal volume was decreased. variations in body posture and lung volume. The mean vital capacity in the sitting position was 81% of predicted normal, and in the supine posture fell by a further 19% in right-sided but only 10% in left-sided paralysis. We use cookies to help provide and enhance our service and tailor content and ads. Abdominal obesity is a chronic condition that can contribute to impairments in lung function, leading to increased risks for respiratory-related diseases. as respiratory rate, tidal volume, lung volume, and forced expiratory volume in the first second. Therefore, in addition to respiratory mechanics, lung volumes and gas exchange 1, 2, the present authors studied the effects of body posture on inspiratory pressure–volume (P–V) curves, as it was anticipated that pronation effects would be reflected by changes in P–V curve characteristics. Published by Elsevier Ltd. All rights reserved. The changes found on assumption of the supine position from the sitting position were similar to those previously reported. Introduction. Copyright © 1961 the American Physiological Society, 15 September 2014 | Journal of Applied Physiology, Vol. Restrictive ventilatory impairment due to reduced thoracic volume is a plausible mechanism to explain the effect of increasing kyphosis severity on declining pulmonary function. LCI is calculated using the FRC and several authors have shown that LCI can be affected by large changes in lung volumes [7–9]. They tested slumped seating, normal seating, standing and a special posture that imitates standing spinal alignment (WO-BPS). The effects of body mass on lung volumes, respiratory mechanics, and gas exchange during general anesthesia. 1 for nomenclature of analysis). Results for the static elastic properties are conflicting. We showed that BMI has significant effects on all of the lung volumes, and the greatest effects were on FRC and ERV, which occurred at BMI values < 30 kg/m 2. Abstract. 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