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OBJECTIVE A study was performed to produce reference standards for spirometric lung function in white children and to calculate standard deviation scores adjusted for gender and pubertal stage. METHODS A cross sectional study was made of 772 white children aged 4.6 to 18.8 years (455 male) tested on an OHIO 840 spirometer and assessed anthropometrically(More)
KOOYMAN, G. L., J. P. SCHROEDER, D. M. DENISON, D. D. HAMMOND, J. J. WRIGHT, and W. P. BERGMAN. Blood nitrogen tensions of seals during simulated deep dives. Am. J. Physiol. 223(5) : 1016-1020. 1972.-Three species of seal were subjected to a total of 65 simulated deep dives equivalent to depths ranging from 30 to 272 m (4-28.2 atm absolute (ATA)) in a(More)
OBJECTIVE A study was performed to determine reference ranges for whole body plethysmographic gas volumes and single breath gas transfer in healthy prepubertal and pubertal schoolchildren. METHODS The study was performed in 772 white London schoolchildren (455 male) who were clinically examined, assessed auxologically and, in 63% of cases, pubertally(More)
A simple and standardized test has been developed to measure airway responsiveness to cold dry air. This consists of stepwise increases in ventilation of dry subfreezing air at 10, 20, 40 and 60% of predicted indirect maximum breathing capacity (IMBC). For each step, the inhalation time was 3 min. The optimal time between the steps was 5 min. Exposure(More)
Effective pulmonary blood flow was measured with a soluble inert gas uptake method (10% argon, 3.5% freon-22, 35% oxygen, balance nitrogen) in 98 apparently healthy children aged 5-14 years. None had any evidence of cardiorespiratory disease and all had normal values for absolute and dynamic lung volumes and transfer factor for carbon monoxide. Values of(More)
We have compared the results of gas analysis by respiratory mass spectrometry using long (30m) sampling probes with those obtained using conventional short (1.3m) probes, examining both static gas mixtures and respired gas at the mouth during manoeuvres designed to make the concentrations of inspired marker gases change in a complex way within a breath. The(More)