Abhishek Balo , Tonkey Pegu , Sidhartha Rajbongshi , Pabitra Pran Gogoi , Pranjit Boruah , Arindom Baruah , O. Jiten Singh

Centre for Studies in Physical Education and Sports, Dibrugarh University, Dibrugarh, 786004, Assam, India
Author    Correspondence author
International Journal of Clinical Case Reports, 2026, Vol. 16, No. 2   
Received: 21 Feb., 2026    Accepted: 20 Mar., 2026    Published: 31 Mar., 2026

This is an open access article published under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

High-Intensity Interval Training (HIIT) has emerged as a highly efficient conditioning method in athletic performance development. While HIIT has been widely studied in adults, limited research has investigated its effects on adolescent athletes, a population undergoing critical physical and physiological development. The purpose of this study was to examine the impact of an 8-week HIIT program on endurance and speed performance in adolescent athletes. Forty male and female athletes (age 14~17) were randomly assigned to either a HIIT group (n=20) or a control group performing traditional endurance and sprint training (n=20). Endurance was assessed using VO₂ max testing, and speed was evaluated through a 30-meter sprint test. Following the intervention, the HIIT group demonstrated a significant improvement in VO₂ max (10.8% increase, p<0.01) and 30-meter sprint times (8% improvement, p<0.05), whereas the control group showed only marginal gains (3.1% and 1.2%, respectively,). These findings suggest that HIIT provides superior benefits for improving both aerobic capacity and speed compared to traditional training methods in adolescent athletes. The study highlights the potential of HIIT as a time-efficient and effective training strategy for youth sports performance.

HIIT; Adolescent; Endurance; Speed; Sports training