A. Fathy, K., and كسرى. “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 (RJSS), vol. 19, no. 60, June 2025, pp. 375-8, doi:10.33899/rajsport.2013.66739.