Effects of HIIT Model Progressive Sprint-Release and TUJA Shuttle Run in increasing aerobic capacity, anaerobic capacity, and speed: a comparative study in female volleyball athletes

Introduction: The HIIT training model has many variations and these variations are known to have a positive effect on physical improvement. Objective: the purpose of this study was to reveal the differences between two different HIIT models, namely Progressive Sprint-Release (PSR) and TUJA Shuttle Run (TUJA) in increasing aerobic capacity, anaerobic capacity, and speed. Methodology: The research design used was a quasi-experimental comparative study. The participants were 12 people who were divided into two groups, 6 people in the PSR group and 6 people in the TUJA group. The instruments used included MFT to measure aerobic capacity, a 300-meter sprint to measure anaerobic capacity, and a 20-meter sprint. Descriptive statistics, paired sample t-test, and Mann-Whitney test were used as data analysis techniques with the help of Microsoft Office Excel 2016 and SPSS version 25 applications. Results: The results of the paired sample t-test showed that the PSR group and TUJA group were equally able to increase aerobic capacity (p <0.05), anaerobic capacity (p <0.05), and speed (p <0.05). However, from the results of the Mann-Whitney U test, it is known that aerobic capacity and speed have significant differences (p <0.05), while not in the anaerobic capacity variable (p> 0.05). Discussion: The results of this study support the previous studies. HIIT PSR and TUJA models have a positive effect. Conclusions: The two new HIIT models, namely PSR and TUJA, can increase aerobic capacity, anaerobic capacity, and speed. Then, PSR and TUJA have significant differences in increasing aerobic capacity and speed, while in the anaerobic capacity variable, there is no significant difference.