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Area of Science:

  • Human microbiome research
  • Exercise physiology
  • Gastroenterology

Background:

  • The human gut microbiome plays a crucial role in overall health.
  • Physical activity is increasingly recognized as a significant factor influencing gut microbial composition.

Purpose of the Study:

  • To investigate the acute effects of extreme endurance exercise on the gut microbiome composition.
  • To analyze changes in bacterial diversity and abundance in an elite ultramarathon runner.

Main Methods:

  • Collected fecal samples from an elite ultramarathon runner at four time-points: pre-race (21 and 2 weeks prior) and post-race (2 hours and 10 days after).
  • Assessed anthropometrics, body composition, and maximal/submaximal exercise performance.
  • Performed gut microbiome analysis, including alpha diversity and phylum-level composition (Firmicutes/Bacteroidetes ratio).

Main Results:

  • Significant shifts in gut microbiome composition were observed 2 hours post-race.
  • Alpha diversity (Shannon Index) increased, and the Firmicutes/Bacteroidetes ratio dramatically rose from 4.4 to 14.2.
  • Specific bacterial genera showed marked changes: Veillonella (+14,229%) and Streptococcus (+438%) increased, while Alloprevotella (-79%) and Subdolingranulum (-50%) decreased.

Conclusions:

  • This case study demonstrates the most rapid and substantial changes in the human gut microbiome following acute exercise reported to date.
  • Exercise, particularly extreme endurance events, acts as a potent modulator of gut microbial ecology.
  • Findings highlight the dynamic interplay between physical exertion and the gut microbiome, underscoring its impact on human health.