Validity and reliability of technology-based reactive agility tennis test (RATT)

Background: Reactive agility ability is part of a vital motor component in tennis that requires a more specific assessment according to the needs of the sport. Aim: This study analyzed the validity and reliability of technology-based reactive agility tests on tennis. Method: It is a research and development (R&D) research, which involves developing a measuring instrument for a reactive agility tennis sports. The research subjects were divided into four groups; first, based on a literature review of SINTA/international accredited journals; second, seven sports evaluation experts; third, 13 certified practitioners/coaches and 78 tennis athletes obtained from coaches; fourth, 40 randomly obtained tennis athletes. The data collection technique used the Likert scale, while the data analysis technique used the Aiken V validation test. Reliability test used person product moment statistics. Results: Research on the construction of the tennis Reactive Agility measuring instrument has good content validity with a V value of 0.85, and the Intraclass Correlation Coefficient (ICC) value of 0.8 is categorized as good inter-rater reliability. Conclusion: The results show high content validation and high inter-rater test reliability in the construction of technology-based reactive agility tests for tennis sports, and this developing reactive agility test instruments can be used by coaches to evaluate and train the ability of tennis athletes.