Effects of lower body pressure changes on pulmonary function

Richard J Coast, Joseph A. O'Kroy, Frank M. Akers, Trachelle Dahl

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Purpose: 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. Methods: 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: 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. Conclusions: These results suggest that part of the change in pulmonary function following heavy exercise is related to an increased thoracic blood volume. The lack of change in lung compliance suggests that the effect of altered thoracic blood volume is to displace air and not to change the mechanical properties of the lungs.

Original languageEnglish (US)
Pages (from-to)1035-1040
Number of pages6
JournalMedicine and Science in Sports and Exercise
Volume30
Issue number7
DOIs
StatePublished - Jul 1998

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Vital Capacity
Lower Body Negative Pressure
Pressure
Lung
Blood Volume
Lung Compliance
Thorax
Forced Expiratory Volume
Air

Keywords

  • Compliance
  • Exercise
  • Lung function
  • Thoracic blood volume

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health
  • Physical Therapy, Sports Therapy and Rehabilitation
  • Orthopedics and Sports Medicine

Cite this

Effects of lower body pressure changes on pulmonary function. / Coast, Richard J; O'Kroy, Joseph A.; Akers, Frank M.; Dahl, Trachelle.

In: Medicine and Science in Sports and Exercise, Vol. 30, No. 7, 07.1998, p. 1035-1040.

Research output: Contribution to journalArticle

Coast, Richard J ; O'Kroy, Joseph A. ; Akers, Frank M. ; Dahl, Trachelle. / Effects of lower body pressure changes on pulmonary function. In: Medicine and Science in Sports and Exercise. 1998 ; Vol. 30, No. 7. pp. 1035-1040.
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