article 2026 10 pages HEART RATE VARIABILITY AS A MARKER OF TRAINING READINESS IN ATHLETES B.B. DONIYOROV, Z.F. MAVLYANOVA, M.T. KHAMDAMOVA JournalAVICENNA BULLETINDOI10.25005/2074-0581-2026-28-1-152-161Populationathletes View on DOI ↗