International Journal of Human Movement and Sports Sciences 10(3): 469-475, 2022 http://www.hrpub.org DOI: 10.13189/saj.2022.100314 The Improvement of Power Endurance and Aerobic through Interval Method by Using Vest Jackets Dikdik Zafar Sidik * , Fitri Rosdiana Department of Coaching Education, Faculty of Sport and Health Education, Universitas Pendidikan Indonesia, Bandung, Indonesia Received January 30, 2022; Revised May 13, 2022; Accepted May 28, 2022 Cite This Paper in the following Citation Styles (a): [1] Dikdik Zafar Sidik, Fitri Rosdiana , "The Improvement of Power Endurance and Aerobic through Interval Method by Using Vest Jackets," International Journal of Human Movement and Sports Sciences, Vol. 10, No. 3, pp. 469 - 475, 2022. DOI: 10.13189/saj.2022.100314. (b): Dikdik Zafar Sidik, Fitri Rosdiana (2022). The Improvement of Power Endurance and Aerobic through Interval Method by Using Vest Jackets. International Journal of Human Movement and Sports Sciences, 10(3), 469 - 475. DOI: 10.13189/saj.2022.100314. Copyright©2022 by authors, all rights reserved. Authors agree that this article remains permanently open access under the terms of the Creative Commons Attribution License 4.0 International License Abstract Vest jacket is a training tool that attaches an external load to the jacket pocket which aims to provide resistance to the body during exercise. This research aims to improve power endurance and aerobic through the interval method by using vest jackets. The method used in this research was an experiment with One-Group Pretest-Posttest design. The sample was 17 futsal players who joined the Pro Futsal League in 2020. The research instruments were in the form of power endurance ability test through a Multistage Hurdle Jump Test and aerobic test through a Bleep Test. The data analysis t-test with a significant level of 5% uses SPSS 18 software. The results show that interval method training using a vest or weighted jacket has a significant effect on increasing power endurance and aerobic abilities. The conclusion in this study is that the increase in aerobic capacity is influenced by interval method training using a resistance vest jacket and the increase in the ability of power endurance is progressively greater because the elements of the training material are more dominant with heavy work muscles. For further research, it is suggested that the scientific development in coaching should be more effective and efficient. Therefore, in this research, it can be developed through other forms of training or method to sports that are more specifically dominant in physical abilities, such as sports that are dominant power endurance and dominant endurance. Keywords Interval Method, Vest Jacket, Power Endurance, Aerobic, Futsal 1. Introduction Futsal player needs physical abilities in the form of power endurance and aerobic which according to [1], the leg muscle power is very important to jump and run in intermittent sports. Maintaining and increasing leg power are important for futsal athletes who do a lot of sprints during trainings and matches which will cause muscle fatigue. Then, according to [2], if we take a look at the characteristics of the futsal sport that is played for 20x2 times, high aerobic abilities are supported by good anaerobic abilities. Aerobic capacity is the ability to maintain high work output for long periods of time [3]. VO 2 max is also expressed as the total volume of oxygen used per minute (ml/kg/min) [4]. To improve physical abilities, many training methods are used. One of them is High Intensity Interval Training method or commonly called as HIIT. Interval training involves repetition and recovery exercises [5, 6]. It involves a repetition duration of 10-30 seconds and with recovery done actively or passively [7, 8]. HIIT training is 90% to 100% of vo 2 max [9, 10]. According to [11] the distance of high intensity interval training using an aerobic energy system is more than 30 seconds while the training interval using anaerobic energy system is between 10 to 30 seconds. Moreover, the time span for high and low intensity interval trainings is between 10 seconds to 4 minutes. To sum up, HIIT training from the beginning of the initial warming up, core, and cooling down can take place within thirty minutes based on the intensity of the exercise. Interval training consists of the duration and