Prostaglandin E release from dog skeletal muscle during restricted flow exercise

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Abstract
Prostaglandin E (PGE) release from the anterior calf muscles of anesthetized dogs was measured during and following exercise. Blood flow was held constant at 15.5 +/- 1.6 (SEM) ml.min-1. 100 g-1 and the muscles were stimulated for 20 min at a frequency of 4 Hz. PGE release dropped from a resting level of 11.4 +/- 3.8 ng.min-1.100 g-1 to 6.5 +/- 2.0 ng.min-1.100 g-1 during exercise (P less than 0.05). Following exercise, PGE release slowly returned to and eventually exceeded the resting level over a 60-min period. Return of vascular resistance to control was even more prolonged. Indomethacin (5 mg/kg) caused 1) an increase in resting resistance (40%), 2) a drop in PGE release (48% at rest), and 3) a more rapid return of vascular resistance to control following exercise. PGE release does not appear to contribute to the vasodilation during exercise, but can account for the portion of vascular resistance recovery not blocked by indomethacin. The remaining prolonged vasodilation could be explained by another as yet unidentified vasodilator(s). This preparation exhibits tonic prostaglandin release that causes a vasodilation at rest.

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