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Composition of alveolar surfactant changes with training in humans
Author(s) -
Doyle Ian R.,
Morton Sharon,
Crockett Alan J.,
Barr Heather A.,
Davidson Kate G.,
Jones Meril J.,
Jones Michael E.,
Nicholas Terence E.
Publication year - 2000
Publication title -
respirology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.857
H-Index - 85
eISSN - 1440-1843
pISSN - 1323-7799
DOI - 10.1046/j.1440-1843.2000.00251.x
Subject(s) - pulmonary surfactant , medicine , endocrinology , rest (music) , surfactant protein a , heart rate , lung , biochemistry , chemistry , blood pressure
Objective: We test the hypothesis that the changes we observed previously in the relative amounts of disaturated phospholipids (DSP), cholesterol (CHOL), and surfactant protein‐A (SP‐A) in human alveolar surfactant in response to acute exercise, and which were related to fitness, can be induced by training. Methodology: We examine the effect of 7 weeks' training on these major surfactant components, together with surfactant protein‐B (SP‐B), in bronchoalveolar lavage fluid harvested from 17 males, both at rest and after acute exercise. Fitness was assessed as workload/heart rate achieved during cycling for 30 min at 90% of theoretical maximal heart rate, and was increased in all subjects following training (mean increase 22.2 ± 3.91%; P = 0.001). Results: Training significantly increased the SP‐A/DSP, SP‐B/DSP, SP‐A/CHOL and SP‐A/SP‐B ratios in whole surfactant harvested from subjects both at rest and immediately following exercise. Training also increased the SP‐B/CHOL ratio at rest. Changes were particularly marked at rest in the SP‐A/DSP, SP‐A/CHOL, and SP‐B/CHOL ratios in the tubular myelin‐rich fraction, and after exercise in the SP‐A/DSP, SP‐A/CHOL, and SP‐A/SP‐B ratios in the tubular myelin‐poor fraction. Conclusion: We conclude that training markedly alters the composition of alveolar surfactant both at rest and with exercise; the physiological significance of these changes remains to be determined.