Hassan Abdul Hadi Lahimes. “The Effect of the High Intensity of the Physical Effort by the Interrupted and the Continuous on the Beta-Endrophine Concentration and Some of the Physiological Changes for Men in (45-50) Years Old”. Modern Sport, vol. 18, no. 2, June 2019, pp. 537-46, https://jcopew.uobaghdad.edu.iq/index.php/sport/article/view/1568.