The efficacy of Credé's maneuver to promote voiding was evaluated prospectively in 207 patients with a variety of lower urinary tract disorders. The normal response to Credé's maneuver was a contraction of the external urethral sphincter (the Credé effect), an increase in urethral pressure and maintained closure of the vesical neck. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.