The aim of the current research is to identify the effect of the number of dives on some physiological variables among diving instructors, using the descriptive approach "in a survey method" to suit the nature of the research and represent the research community in diving coaches registered with the Chamber of Diving and Marine Activities in Hurghada in the year 2020 AD in the Red Sea Governorate in the Arab Republic of Egypt Its strength is (116) diving instructors. The researchers selected a random sample from the research community. Its strength was (60) diving instructors, with a percentage of 51.7%. The study was carried out from 4/2/2020 to 15/2/2020, Physiological measurements were carried out under investigation. The two researchers concluded that the large number of dives among diving instructors led to a kind of physiological adaptation and improvement and a positive effect on some physiological variables (pulse rate in rest and after diving, vital (absolute) blood pressure, systolic and diastolic blood pressure at rest. After diving) for the benefit of diving instructors with a greater number of dives, the researchers also found that there is a difference between the categories of diving instructors according to the 1- Number of submarines 2- Physiological variables 3- Dive coaches Introduction and research problem: Scuba diving is one of the sports activities that fall under water sports, which has caught the attention of most physicians and physiologists to know the responses resulting from the practice of this sport of a unique nature, unconventional in comparison to other water sports, as it has a unique structure, which is the depths of water that require the human being to be provided with more Oxygen and air while diving (186,187)) "Bahaa El-Din Salama" (2000 AD) indicates that athletes who practice diving under water are subject to a great and unique challenge as a result of the physical effort under water, and these athletes meet many physiological changes that the body must overcome in order to continue to perform well and these changes are Often due to the increased pressure of the bronchial gases and the dissolved oxygen in the body fluids and other changes related to the nature, intensity, and duration of underwater performance (263). From what has been previously presented, and through the researchers' review of references and studies that deal with diving, one can determine the problem of this research, trying to identify the effect of the number of times diving on some physiological aspects of the body for the purpose of evaluating and directing training and learning of diving.
