Effects of lower body pressure changes on pulmonary function

Medicine and Science in Sports and Exercise
J R CoastT Dahl

Abstract

During and following exercise there are a number of changes in pulmonary function, among which is a decrease in forced vital capacity (FVC). Several potential mechanisms may explain this decreased FVC, including an exercise-induced increase in thoracic blood volume. We tested the hypothesis that altered thoracic blood volume alone, as produced by the application of 30 mm Hg lower body negative (LBNP) or positive pressure (LBPP) for 5 min, would change FVC and forced expiratory volume in 1 s (FEV1.0). Further, we tested whether the changes in pulmonary function were related to initial lung volume and whether the lower body pressure changes led to an altered lung compliance as measured by static pressure-volume curves. Results indicated that with LBNP, FVC, and FEV1.0 were significantly increased by approximately 0.15 L and 0.18 L, respectively. When LBPP was applied, FVC and FEV1.0 were decreased by approximately 0.18 and 0.14 L, respectively. The increase in FVC with LBNP was significantly related to the original FVC (r = 0.66, P < 0.05). There was no significant correlation between the increase in FEV1.0 and the original FEV1.0 (r = 0.48, P > 0.05). Pulmonary compliance was not changed significantly by the application of LBPP....Continue Reading

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Citations

Aug 11, 2015·The Australian Journal of Rural Health·Sonill S Maharaj, Jibril M Nuhu
Dec 13, 2018·Physiological Reviews·Nandu GoswamiVictor A Convertino
Jun 5, 2007·European Journal of Applied Physiology·S VergesC M Spengler
Jul 27, 2000·Medicine and Science in Sports and Exercise·O InbarY Weinstein

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