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

Abstract

The world has witnessed significant scientific and technical progress in the application of modern scientific and technological foundations in the sports field. This progress has contributed to raising the scientific level in general and the sports level in particular. This is evident in many sports, including volleyball, which has seen substantial development in the way it performs and implements its offensive and defensive skills. This development is due to the positive application of many sciences, such as physiology, anatomy, training, and other aspects of physical education (Al-Dulaimi and Dhanoun, 1991).