Misner, J E Cardiovascular stress associated with the recreational tennis play of middle-aged males. [electronic resource] - American corrective therapy journal - 4-8 p. digital Publication Type: Comparative Study; Journal Article ISSN: 0002-8088 Subjects--Topical Terms: AdultAge FactorsCardiovascular Diseases--diagnosisElectrocardiographyFemaleHeart RateHumansMaleMiddle AgedMonitoring, PhysiologicPhysical ExertionPhysical FitnessRespiration Disorders--diagnosisSportsTennis