THE EFFECT OF HIGH-INTENSITY PHYSICAL EFFORT ON CERTAIN VARIABLES OF THE ELECTRICAL ACTIVITY OF THE MUSCLES ACTING ON THE KNEE JOINT, BLOOD ACIDITY LEVEL (PH), AND THEIR RELATIONSHIP TO THE ACCURACY OF PERFORMING THE DIAGONAL SPIKING SKILL IN VOLLEYBALL. CJDI [Internet]. 2025 Mar. 27 [cited 2026 Feb. 18];3(3):42-55. Available from: https://multijournals.org/index.php/synergy/article/view/3310