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“In both groups methacholine challenge resulted in an increase in R (f) especially at 5 and 10 Hz, and a marked decrease in X(f) over the whole frequency spectrum.”
Journal of aerosol medicine : the official journal of the International Society for Aerosols in Medicine • 2001 | View Paper
“Intravenous administration of L-arginine augmented the forearm blood flow response to methacholine in the hypercholesterolemic individuals, but not in the normal subjects.”