.y.Al Saffar, Ziad, and زياد. “The Effect of Aerobic Endurance Training With Proposed Periods Rest On the Fatigue Index and Recovery Curve of Heart Rate for Football Players”. Al-Rafidain Journal For Sport Sciences (RJSS) 20, no. 64: 95–108. Accessed September 27, 2025. https://jwups.uomosul.edu.iq/index.php/rjss/article/view/35736.