THE EFFECT OF RUBBER RESISTANCE EXERCISES ON BONE DENSITY AND SOME KINEMATIC VARIABLES OF THE FLAT SERVE SKILL IN TENNIS

Through the researcher’s follow-up of the sample of the study as she is specialist in kinetic biomechanical analysis, she found that sample members unable to endure training pressures during training, especially high training loads. The researcher thinks that the reason for this is due to muscular strength which may cause them deficiency in bone density. This, in turn, leads to a degradation of some biomechanical variables related to perform the flat serve skill in tennis, which in turn reflects on accuracy. That’s why the researcher to include this kind of exercise using rubber and determine its effect on bone density and some kinematic variables related to flat serve in tennis in preparation and ball impact moments. The research was conducted on a sample of 8 players from Al Araby Club and their ages from 20 to 22 years old. After pre- tests, the prepared training was performed for 12 weeks in four training units (each unit is 90 minutes). After the end of the set period, post-tests were performed in the same conditions of pre-tests and with the same work team, and then the researcher analyzed players’ movements using the Kenova program for kinetic analysis to extract the kinematic variables under study. Next, the researcher used Statistical Package for the Social Sciences (SPSS) program to show and analyze data in special tables. Finally, scientific result discussion with the aid of some references related to the topic of the study. The researcher reached a set of conclusions such as that rubber resistance exercises have a positive effect on increasing bone density of the arms which was reflected positively on some kinematic variables too.