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Related Experiment Video

Updated: Jun 29, 2025

A Real-World High-Intensity Interval Training Protocol for Cardiorespiratory Fitness Improvement
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High-intensity interval training (HIIT) can cause ischemic colitis, even at home. This case highlights exercise-induced ischemic colitis (EIIC) outside of endurance sports.

Keywords:
diarrhoeahigh-intensity exerciseischaemic colitisischemic colitislower gestrointestinal bleed

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Area of Science:

  • Gastroenterology
  • Sports Medicine
  • Exercise Physiology

Background:

  • Ischemic colitis is typically associated with factors like atherosclerosis or hypoperfusion.
  • Exercise-induced ischemic colitis (EIIC) is a rare condition, often linked to prolonged endurance activities.

Observation:

  • A male in his 40s presented with hematochezia immediately following a one-hour high-intensity interval training (HIIT) session at home.
  • Investigations revealed ischemic colitis in the mid-sigmoid, confirmed by histology.

Findings:

  • The patient was diagnosed with exercise-induced ischemic colitis (EIIC) attributed to HIIT.
  • This represents the first reported case of EIIC secondary to home-based HIIT.

Implications:

  • EIIC should be considered in the differential diagnosis of lower gastrointestinal bleeding after strenuous exercise, not limited to endurance athletes.
  • Understanding risk factors and expanding the diagnostic context for EIIC is crucial for timely management.