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Related Experiment Video

Updated: Jan 15, 2026

Determining The Electromyographic Fatigue Threshold Following a Single Visit Exercise Test
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Performance Fatigability at Task Failure and Beyond: Distinct Patterns of Recovery Following Constant Load Versus

Zachary J McClean1,2, Keenan B MacDougall1, Matthew J Jordan1,2

  • 1Faculty of Kinesiology, University of Calgary, Calgary, Canada.

International Journal of Exercise Science
|October 13, 2025
PubMed
Summary
This summary is machine-generated.

High-intensity interval training (HIIT) impacts post-exercise recovery differently based on work and rest durations. Shorter work intervals in HIIT may enhance neuromuscular recovery compared to constant load exercise.

Keywords:
Neuromuscular recoverydynamic contractionsexercise performancehigh-intensity interval trainingtask failure

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Neuromuscular Function

Background:

  • Total work is often considered the main driver of post-exercise recovery.
  • Work and rest durations during high-intensity interval training (HIIT) can influence physiological stress and recovery.
  • Understanding these nuances is crucial for optimizing training and recovery strategies.

Purpose of the Study:

  • To investigate the recovery time course of neuromuscular function after work-to-rest matched HIIT protocols with varying work interval durations.
  • To compare recovery kinetics between different HIIT protocols and constant load (CL) cycling.
  • To determine the impact of work interval duration on central and peripheral neuromuscular recovery.

Main Methods:

  • 12 participants (6 female) performed ramp incremental tests to determine peak power output (PPO).
  • Participants completed three cycling protocols at 90% PPO: 3 min work/3 min rest HIIT (HIIT3min), 1 min work/1 min rest HIIT (HIIT1min), and constant load (CL).
  • Neuromuscular function was assessed via maximal voluntary contractions (MVC) and femoral nerve stimulation at baseline, task failure (TF), and TF+1, +4, +8 min.

Main Results:

  • MVC force decreased similarly across all conditions at TF, with partial recovery by TF+8min.
  • Evoked muscle twitch force declined more after CL than HIIT1min at TF and recovered faster within TF+8min.
  • Voluntary activation decreased at TF in HIIT1min but not HIIT3min or CL, fully recovering by TF+8min.

Conclusions:

  • Neuromuscular recovery kinetics differ between constant load exercise and work:rest matched HIIT protocols.
  • HIIT protocols with shorter work intervals may facilitate faster peripheral neuromuscular recovery.
  • Central and peripheral neuromuscular recovery exhibit distinct time courses influenced by exercise modality and interval duration.