Microbiota Mediate Enhanced Exercise Capacity Induced by Exercise Training.

Area of Science:

• Exercise physiology
• Microbiome research
• Skeletal muscle metabolism

Background:

• Exercise training improves exercise performance through various physiological adaptations.
• The role of the gut microbiome in mediating these adaptations is increasingly recognized.
• Understanding these mechanisms is crucial for optimizing athletic performance.

Purpose of the Study:

• To investigate the effects of gut microbes on exercise performance in male mice.
• To elucidate the mechanisms by which gut microbiota mediate enhanced exercise capacity after training.
• To examine the impact of exercise training on skeletal muscle blood flow, mitochondrial biogenesis, and oxidative function.

Main Methods:

• Male mice underwent graded exercise tests before and after a 5-week treadmill training program.
• Gut microbes were eliminated using antibiotic (ABX)-treated water to assess their role.
• Measurements included maximal running distance, work to exhaustion, hindlimb blood flow, and mitochondrial markers.

Main Results:

• Exercise training significantly increased maximal running distance and work to exhaustion.
• These performance enhancements were completely abolished after antibiotic treatment.
• Training-induced improvements in blood flow and mitochondrial function (AMPK, SIRT1, PGC-1α, CS, CIV, NO) were also abrogated by antibiotics.

Conclusions:

• Gut microbiota play a critical role in mediating exercise-induced improvements in exercise capacity.
• Key mechanisms include enhanced skeletal muscle blood flow and mitochondrial biogenesis/oxidative function.
• The findings underscore the importance of considering antibiotic use in athletes and its potential impact on performance.