ORIGINAL RESEARCH article
Front. Physiol.
Sec. Exercise Physiology
Volume 16 - 2025 | doi: 10.3389/fphys.2025.1672978
Study of Different Acute SIT Protocols' Impact on 200m Sprinters' Anaerobic Performance
Provisionally accepted
- 1Beijing Sport University, Beijing, China
- 2Jiangxi Normal University, Nanchang, China
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Sprint interval training (SIT), characterized by its "all-out" maximal-intensity efforts, elicits substantial energy output in a short duration, demonstrating superior anaerobic performance. This study compared the acute effects of different SIT protocols to identify the optimal training combination for enhancing anaerobic capacity in 200-meter sprinters. Methods: Twelve male 200-meter sprinters performed SIT sessions in a 2 (sprint duration: 20s, 30s) × 3 (load: 7.5%, 9%, 10% body mass (BM)) × 4 (repetitions) design with 4-minute inter-set rest, assessed via anaerobic power, electromyography (EMG), and blood lactate measures. Results: (1) Duration and load significantly affected peak power (PP), mean power (MP), and fatigue index (FI) (P < 0.05); (2) Sprint duration significantly influenced lower-limb integrated EMG (IEMG) and median frequency (MPF) (P < 0.05), with no notable interaction effects; (3) Both duration and load significantly modulated muscle activation (RMS%) in the rectus femoris, biceps femoris, and vastus lateralis (P < 0.05), but not in the gastrocnemius; (4) Duration significantly increased maximal blood lactate, accumulated lactate, and rating of perceived exertion (RPE) (P < 0.05), whereas load had no independent effect; (5) The interaction between duration and load exhibited highly significant effects on anaerobic performance (P < 0.01). Conclusion: A high-intensity SIT protocol comprising 4 × 20s all-out sprints at 10%BM load with 4-minute rest intervals optimally enhances 200-meter sprinters' anaerobic capacity through multidimensional physiological stimuli, providing an effective training strategy for performance optimization.
Keywords: sit, sprint interval training, Anaerobic capacity, Sprint running, surface electromyography
Received: 25 Jul 2025; Accepted: 22 Aug 2025.
Copyright: © 2025 Liu, Yan, Liu and Gong. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Juntao Yan, Beijing Sport University, Beijing, China
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