Disuse as cause of supersensitivity in the rat urinary bladder*

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Abstract
Ureterostomiain situwas performed to reduce the nervous reflex activation of the bladders without concomitant hypertrophy. In muscle strips of these disused and non‐hypertrophied bladders, supersensitivity to methacholine was demonstrated, which did not increase between 1 and 3 weeks. The supersensitivity did not increase further by combining urinary diversion with section of the preganglionic bladder nerves (decentralization). From the present results it may be concluded that in decentralized and hypertrophied bladders not only hypertrophyper se, previously studied (Ekströmet al.1985), but also loss of nerve impulse traffic (cf. urinary diversion) contribute to the development of supersensitivity.