Task: Information Extraction
Input (English): A tendency towards increased plasma 6-keto-prostaglandin F1 alpha concentration and decreased serum thromboxane B2 concentration was found during the period of regular exercise , but prostaglandin E2 concentrations remained unchanged .
Output (English): plasma 6-keto-prostaglandin F1 alpha concentration, serum thromboxane B2 concentration, prostaglandin E2 concentrations