PPARalpha gene variation and physical performance in Russian athletes

Area of Science:

• Genetics
• Sports Science
• Human Physiology

Background:

• Peroxisome proliferator-activated receptor alpha (PPARalpha) influences skeletal and heart muscle fatty acid metabolism.
• Previous research linked the PPARalpha intron 7 G/C polymorphism to exercise-induced left ventricular growth.
• This study investigated the association between PPARalpha genotype and athletic performance and muscle fiber type.

Purpose of the Study:

• To determine if GG homozygotes are more common in endurance athletes.
• To assess the relationship between PPARalpha genotype and fatty acid metabolism.
• To examine the correlation between PPARalpha genotype and slow-twitch muscle fiber percentage.

Main Methods:

• Genotyping of the PPARalpha intron 7 G/C polymorphism in 786 Russian athletes and 1,242 controls.
• Stratification of athletes by performance type (endurance, power, mixed).
• Analysis of muscle biopsies from 40 male athletes to determine muscle fiber type composition.

Main Results:

• An increasing linear trend of the C allele was observed with a higher anaerobic component in physical performance (P=0.029).
• GG genotype frequencies differed significantly between endurance athletes (80.3%), power athletes (50.6%), and controls (70.0%) (P<0.0001).
• GG homozygotes exhibited significantly higher percentages of slow-twitch muscle fibers (55.5%) compared to CC homozygotes (38.5%) (P=0.003).

Conclusions:

• The PPARalpha intron 7 G/C polymorphism is associated with physical performance in Russian athletes.
• This association may be partly explained by the influence of PPARalpha genotype on muscle fiber type composition.
• The findings suggest a genetic predisposition related to muscle fiber characteristics influencing athletic capabilities.