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The paranasal sinuses are lined with respiratory mucosa of principally the same
structure as in the nasal mucosa but somewhat thinner. This mucosa has a rich blood
flow and advanced system of blood vessels regulated mostly by the autonomous
nervous system but also by otherfactors as acid/base balance and endocrine activity.
The thickness of the nasal mucosa regulates the nasal breathing resistance and varies
with among other factors, body activity.
In this investigation we have studied the effect of physical work on the human maxillary
sinus mucosa.
The investigation shows that, as in the nose, the blood flow and the pulse amplitude
are considerably reduced during physical work, in situations of heavy work falling to
about half of the normal level, and probably result in the redistribution of bloodfrom
the respiratory mucosa. The gas exchange in the paranasal sinus is reduced only to a
small extent, the reduction being too small to change the antral gas composition
towards pathological conditions.