Biological Variables Associated With the Response to Intensive Training in Athletes

NCT05279196 | Not Yet Recruiting

• 1 other identifier: 21_0102
• Study Type: interventional
• Target: 40
• Locations: 1 country
• Sites: 1

Brief Summary

There is in humans, at the muscular level, a great interindividual variability in response to the same mechanical stress. This phenotypic variability is multifactorial, influenced by environmental factors as well as multiple genetic variants. Thus, for the same level of muscle damage, two subjects with the same anthropometric characteristic, the same age, with the same medical history and the same level of physical activity, will present a variable level of muscle regeneration underpinned by the biological function of muscular stem cells and their microenvironment. Thus, faced with the same training, some athletes will develop iterative muscular lesions and more disabling repair deficits than others without knowing the reason of this greater susceptibility. Indeed, the links between the genotype of the skeletal muscle fiber and its response to exercise, as well as the regulation of muscle mass are poorly understood. Yet, in young adults, up to 70% of the observed variability in muscle strength and size is hereditary. This heritability of muscle size and strength seems to be lower in older people, probably related to increased comorbidity. Numerous experiments with athletes subjected to the same resistance exercise training have identified good and bad hypertrophic skeletal muscle responders. However, genetic variants that contribute to skeletal muscle strength and mass are largely understudied while a growing body of evidence indicates that epigenetic effectors, which modulate gene expression, may contribute to human muscle response heterogeneity to the same mechanical stress. Thus, to date, no analysis of the role of the interaction between genetic and epigenetic factors involved in the muscle functional response to exercise exists. The main hypothesis is that the epigenetic status of muscle stem cells (satellite cells) is an important contributor in muscle mass response to exercise by modulating chromatin architecture. Thus this study will identify the epigenetic modifications induced by training and their interaction with the genetic factors involved in the response of the biological function of the satellite cells to this training and on the other hand, to be able to link it to a blood signature.

Conditions

Muscle Injury

Outcome Measures

Primary Outcomes (1)

• DNA methylation profile of satellite cells associated with a gain in muscle mass

  DNA methylation profile of satellite cells from the quadriceps obtained from athletes at the start and after 6 months of training, will be determine using DNA methylation profiling microarray. Two groups of athletes will be constituted according to the gain (in % compared to the initial value) in muscular strength of the quadriceps induced by the training and evaluated on a strength bench. In order to identify a DNA methylation signature associated to the gain in muscle mass, DNA methylation profile will be compared between athletes considered to be good or bad responders to training.

  6 months

Secondary Outcomes (3)

• Number and size of myoblasts obtained per satellite cells from the quadriceps

  6 months

• Comparison of number and size of myoblasts obtained in vitro and the muscular response to training in the same athlete

  6 months

• Comparison of the DNA methylation profile of satellite cells from the quadriceps and blood mononuclear cells in the same athlete

  6 months

Study Arms (1)

Muscular response to the training

EXPERIMENTAL

Epigenetic signature associated with different levels of muscle response induced by 6-month training

Other: Quadriceps microbiopsy and blood collection

Interventions

Quadriceps microbiopsy and blood collection OTHER

Microbiopsy of the quadriceps muscle using a needle, "Tru-cut" biopsy, associated with a blood sampling at the start and after 6 months of a muscle strengthening training program

Muscular response to the training

Eligibility Criteria

• Age: 40 Years - 60 Years
• Sex: male
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64)

You may qualify if:

• Senior male athlete aged between 40 and 60 inclusive
• Athlete following a program over a season of muscle building at CREPS, the objective of which is to improve their performance in a middle-distance race.

You may not qualify if:

• Subject having a contraindication to follow the complete muscle building program at CREPS with in particular a contraindication to the measurement of muscle mass by Magnetic Resonance Imaging
• Subject presenting all criteria which can by themselves alter the function of the respiratory muscles such as chronic obstructive pulmonary disease, heart failure, systemic infection, neuromuscular pathology, psychiatric pathology, metabolic disorder.
• Subjects with coagulopathy or thrombocytopenia.
• Use of anabolic drugs to increase muscle mass
• Subject suspected of doping
• Subject allergic to xylocaine

Sponsors & Collaborators

• University Hospital, Montpellier: lead

Study Sites (1)

University Hospital

Montpellier, 34295, France

Location

Central Study Contacts

Stephan MATECKI, MD-PhD

CONTACT

467335908; stephan.matecki@umontpellier.fr

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: NA
• Masking: NONE
• Purpose: BASIC SCIENCE
• Intervention Model: SINGLE GROUP
• Sponsor Type: OTHER
• Responsible Party: SPONSOR

Model Details: Comparative study of two groups of subjects formed a posteriori from a cohort follow-up

Study Record Dates

• First Submitted: March 3, 2022
• First Posted: March 15, 2022
• Study Start: September 1, 2025
• Primary Completion (Estimated): March 1, 2029
• Study Completion (Estimated): March 1, 2029
• Last Updated: September 19, 2024

Record last verified: 2024-09

Data Sharing

• IPD Sharing: Will not share

Locations

FR (1)