Abstract
Physical exercise affects the human gut microbiota, which in turn influences
athletes’ performance. The current understanding of how the microbiota
of professional athletes changes along with different phases of training is
sparse. We aim to characterize the fecal microbiota in elite soccer players
along with different phases of a competitive season using 16 S rRNA gene
sequencing. Fecal samples were collected after the summer off-season period, the
pre-season retreat, the first half of the competitive season, and the 8 weeks of
COVID-19 lockdown that interrupted the season 2019–2020. According to
our results, the gut microbiota of professional athletes changes along with the
phases of the season, characterized by different training, diet, nutritional
surveillance, and environment sharing. Pre-season retreat, during which
nutritional surveillance and exercise intensity were at their peak, caused a
decrease in bacterial groups related to unhealthy lifestyle and an increase in
health-promoting symbionts. The competitive season and forced interruption
affected other features of the athletes’ microbiota, i.e., bacterial
groups that respond to dietary fiber load and stress levels. Our longitudinal
study, focusing on one of the most followed sports worldwide, provides baseline
data for future comparisons and microbiome-targeting interventions aimed at
developing personalized training and nutrition plans for performance
maximization.
Key words
gut microbiota - athletes - soccer - longitudinal - 16 S rRNA sequencing