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Fast Start Strategy in High-Intensity Interval Training in Rugby Union Academy Players.

Loïc Louit1,2, Virgile Merlen3,2, Jonathan Ward1,4

  • 1Laboratory Youth-Physical Activity and Sports-Health (J-AP2S), Toulon University, Toulon, France.

Journal of Sports Science & Medicine
|November 10, 2025
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Summary
This summary is machine-generated.

A fast-start strategy in high-intensity interval training (HIIT-FS) increases time spent at high oxygen uptake levels in rugby players without altering external load. This method shows promise for enhancing aerobic capacity, though its higher perceived exertion suggests strategic application.

Keywords:
HIITcardiovascularintense exercisephysical fitnessteam sport

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • High-Intensity Interval Training (HIIT)

Background:

  • Fast-start strategy (HIIT-FS) optimizes oxygen uptake in endurance athletes.
  • Effects of HIIT-FS on team sport athletes remain largely unexplored.
  • Rugby union players require effective training to enhance aerobic capacity.

Purpose of the Study:

  • To compare physiological, perceptual, and external load responses between HIIT-FS and constant-intensity HIIT (HIIT-C) in academy rugby players.
  • To determine if HIIT-FS can enhance time spent at high oxygen uptake levels in team sport athletes.

Main Methods:

  • Eight male rugby players performed a 30-15 Intermittent Fitness Test (IFT) to establish velocities.
  • Participants completed both HIIT-FS and HIIT-C protocols.
  • Measures included gas exchange (V̇O2peak, V̇O2mean), heart rate (HRpeak), ventilation (V̇Emean), respiratory frequency (fRmean), GPS-derived external load, and Rate of Perceived Exertion (RPE).

Main Results:

  • HIIT-FS significantly increased time spent at ≥90% V̇O2peak (318.8s vs. 230.6s) and mean %V̇O2peak (86.1% vs. 82.1%) compared to HIIT-C.
  • No significant differences in external load metrics (e.g., total distance, sprint distances) were observed between protocols.
  • HIIT-FS resulted in significantly higher RPE (9.0 vs. 7.8) and greater time at ≥90% HRpeak during early intervals.

Conclusions:

  • HIIT-FS effectively increases time at high oxygen uptake levels in rugby players without increasing external load.
  • HIIT-FS is a promising strategy for improving aerobic capacity in team sport athletes.
  • Due to higher perceived exertion, HIIT-FS may be best suited for shorter sessions or when limited training volume is possible.