Changes in GLP-1 and GIP During Endurance Training in Competitive Triathletes: A Pilot Observational Study

Area of Science:

• Endocrinology
• Sports Science
• Exercise Physiology

Background:

• Professional triathlon training is a demanding physiological pursuit.
• Understanding metabolic adaptations in elite athletes is crucial for performance.
• Serum concentrations of GLP-1, GIP, testosterone, and NF-κB were investigated in relation to training load.

Purpose of the Study:

• To compare serum concentrations of GLP-1, GIP, testosterone, and NF-κB between elite triathletes during preparatory and competitive periods and untrained individuals.
• To assess potential correlations between these biomarkers and training phases.

Main Methods:

• A comparative study involving 37 elite male triathletes (ages 25-50) and 20 healthy untrained males.
• Serum samples were analyzed using the ELISA method to determine concentrations of testosterone, GLP-1, GIP, and NF-κB.
• Data were compared between training periods (preparatory vs. competitive) and against a control group.

Main Results:

• GLP-1 concentrations increased significantly from the preparatory to the competitive training phase.
• GIP serum concentrations were higher in trained triathletes compared to the untrained control group.
• No significant differences in testosterone or NF-κB were found between groups, but a positive correlation was observed between NF-κB and GLP-1/GIP.

Conclusions:

• Incretins (GLP-1, GIP) and NF-κB may serve as potential biomarkers for metabolic adaptation to exercise in athletes.
• These findings suggest a role for monitoring these markers in optimizing individual training regimens.
• Further research is warranted to elucidate the complex relationships between these biomarkers and athletic performance.