A. Fathy, Kessra. “Effects of Repeated Anaerobic Effort on Heart Rate During Various Effort and Recovery Periods and the Level of Accumulated Lactate for Sprint Runners”. Al-Rafidain Journal For Sport Sciences 19, no. 60 (March 1, 2013): 375–385. Accessed October 2, 2025. https://rsprs.uomosul.edu.iq/index.php/rsprs/article/view/50396.