IDENTIFICATION OF THE OPTIMAL HIIT PROTOCOL FOR FATIGUE RESISTANCE IN ADOLESCENT ATHLETES: A RANDOMIZED CONTROLLED TRIAL

Authors

  • Myong-Won Seo Department of Sports Medicine and Science, Graduate School of Physical Education, Kyung Hee University, Gyeonggi-do, Republic of Korea
  • Jung-Min Lee Department of Physical Education, College of Physical Education, Kyung Hee University, Gyeonggi-do, Republic of Korea
  • Hyun Chul Jung Department of Sports Coaching, College of Physical Education, Kyung Hee University, Gyeonggi-do, Republic of Korea
  • Joon Young Kim Department of Exercise Science, David B. Falk College of Sport and Human Dynamics, Syracuse University, Syracuse, USA
  • Jong Koon Song Department of Sports Medicine and Science, Graduate School of Physical Education, Kyung Hee University, Gyeonggi-do, Republic of Korea

Abstract

The combat sports athletes developed great gains in both muscular function and fatigue resistance by utilizing high-intensity interval training (HIIT). However, it has not been investigated fully whether different work-to-rest ratios of HIIT show the effectiveness on muscle function in adolescent athletes. The purpose of the study was to compare different work-to-rest ratios by applying different rest times in response to the identical work time during HIIT on muscle function in adolescent taekwondo athletes. Forty-seven adolescent male taekwondo athletes (mean age: 16.7±0.8 years) were randomly assigned to the control group (n=11) vs. three HIIT groups by work-to-rest ratios; (1) 1:2 [30s:60s] (n=12), (2) 1:4 [30s:120s] (n=12), and (3) 1:8 [30s:240s] (n=12). All groups completed 10 experimental sessions over four weeks, while the control group maintained their regular taekwondo training. Muscular functions were measured by assessing isokinetic muscle strength and endurance of the knee extensor and flexor. The participants performed three sets of twenty maximal extension and flexion contractions at 120°s-1 with a 1-min interval between the sets for fatigue resistance. Blood samples were collected to measure free-testosterone, cortisol, creatine kinase, and urea as stress-to-recovery indicators. A positive effect on improving muscle fatigue resistance was observed at the first set of assessments in the HIIT with 1:4 (Δ10.2%, p<.05) and 1:8 groups (Δ8.6%, p<.05). Additionally, the 1:4 group exhibited fatigue resistance improvement in the second set (Δ7.7%, p<.01) without any changes of stress-to-recovery indicators, while the other groups did not show any improvement. The 30s all-out work with 120s rest time, lasting over a brief 4-week period, improved participants’ fatigue resistance. A certain amount of rest time between high-intense movements is required to optimize muscle development in adolescent athletes compared with insufficient rest time.

Key words: HIIT, muscle function, stress-to-recovery indicator, optimal protocol, adolescent athlete

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Published

2022-12-31

How to Cite

Seo, M.-W., Lee, J.-M. ., Jung, H. C., Kim, J. Y., & Song, J. K. . (2022). IDENTIFICATION OF THE OPTIMAL HIIT PROTOCOL FOR FATIGUE RESISTANCE IN ADOLESCENT ATHLETES: A RANDOMIZED CONTROLLED TRIAL. Kinesiology, 54(2), 256–267. Retrieved from https://hrcak.srce.hr/ojs/index.php/kinesiology/article/view/22120

Issue

Vol. 54 No. 2 (2022)

Section

Articles

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