text: 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 .
entities.text: regular exercise
entities.type: intervention
entities.text: plasma 6-keto-prostaglandin F1 alpha concentration
entities.type: outcome
entities.text: serum thromboxane B2 concentration
entities.type: outcome
entities.text: prostaglandin E2 concentrations
entities.type: outcome