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Characterization of the Gut Microbiota Signature According to Physical Fitness and Its Implications for Intestinal Health.

NCT07276464 · Status: RECRUITING · Type: OBSERVATIONAL · Enrollment: 30

Last updated 2025-12-24

No results posted yet for this study

Summary

The gut microbiota comprises all microorganisms inhabiting the digestive tract, evolving throughout life under the influence of various intrinsic and extrinsic factors. Under healthy conditions, the microbiota remains stable, resilient, and maintains a symbiotic relationship with its host. Conversely, dysbiosis refers to an alteration in microbial composition and function, which has been linked to diseases such as inflammatory bowel disease (IBD). IBD, including Crohn's disease and ulcerative colitis, is associated with a disrupted microbiota compared to healthy individuals, leading to impaired intestinal barrier integrity and activation of local inflammatory pathways.

Increasing evidence also suggests that the gut microbiota of athletes differs from that of physically inactive individuals, showing greater microbial diversity and higher concentrations of short-chain fatty acids (SCFAs). In this context, the present clinical study aims to characterize the bacterial metagenome of the gut microbiota across a continuum ranging from inactive individuals to elite athletes with high or very high energy demands. The ultimate goal of this project is to determine whether specific gut microbiota composition and functional profiles are associated with different levels of exercise capacity, and to create a fecal microbiota biobank for future research on intestinal health.

Conditions

  • Healthy

Interventions

DIAGNOSTIC_TEST

Maximal incremental exercise test

Participants will perform this test on a cycle ergometer. Gas exchange will be continuously measured throughout the test, and blood lactate will be sampled at regular intervals until maximal oxygen consumption is reached.

DIAGNOSTIC_TEST

Submaximal exercise test

A 25-min submaximal exercise test on ergocycle under fasting condition. Gas exchanges are measured during all the test and blood lactate will be sampled at regular intervals.

BIOLOGICAL

Fecal sampling

Fecal samples will be collected in order to (1) conduct metagenomic and metabolomic analyses to characterize the gut microbiota composition and function, and (2) create a fecal biobank for future research involving fecal microbiota transplantation in mice.

Sponsors & Collaborators

  • University of Rennes 2

    lead OTHER

Principal Investigators

  • Frédéric DERBRE, PhD · Laboratory of Movement, Sport and health Sciences (M2S)

Eligibility

Min Age
18 Years
Max Age
30 Years
Sex
MALE
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2025-11-17
Primary Completion
2026-04-01
Completion
2026-04-15

Countries

  • France

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT07276464 on ClinicalTrials.gov