Our digestive system, a group of organs that includes the stomach and colon, harbors nearly 100 trillion bacteria. Collectively known as the "gut microbiome," these bacteria help our bodies break down complex carbohydrates and starches while also producing vitamins and hormones. Gut flora, which collectively weighs up to four and a quarter pounds and contains more genes than our actual genome, has escaped observation until recently, when scientists began to study and sequence the 500 to 1,000 different species of bacteria that inhabit each of us.
Although no two people have identical microbiomes, researchers hypothesized for their new study that elite athletes' guts must contain similar bacterial species that help them perform and also recover.
To test their theory, the researchers analyzed stool samples of 201
Next, the researchers isolated a strain of Veillonella atypica from the athletes' poo and fed it to the mice. Treadmill tests showed this bacteria-enhanced diet boosted the animals' performance by 13% compared to the mice not given Veillonella. The lactate, produced when the mice exercised, was metabolized by the bacteria, after which the by-products of this chemical process crossed into the circulatory system and resulted in a performance boost, the new research showed
Creating smart probiotics can not only improve the performance of next generation athletes but also improve the health of patients with certain metabolic disorders or diseases such as diabetes .
Professor Timothy Read of Atlanta's Emory University School of Medicine told CNN that previous studies have already been conducted shown that Veillonella exists in higher abundance in the stools of athletes. The new study takes this one step further by suggesting that this bacterial species may be enriched "due to the breakdown of lactate into the gut produced by exercise," said Read, who was not involved in the research
A weakness of the study is the fact that the "only direct evidence" that Veillonella positively affects exercise potential is treadmill experiments in mice, noted Read. Add to that the evidence of enhanced athletic performance due to the metabolic properties of Veillonella comes from a small number of samples, he said. Although the study is a "part of a trend of interesting papers" that illustrate the striking effects of individual microbes, it only serves as a "preliminary" report and requires some skepticism, said Read.
"Life events such as diseases can change microbiomes," said Read, who studies the role of microbes play in the human body to affect health either as pathogens or as members of the microbiome. How to permanently change our microbiome to improve our health is an active area of research, "he said. "Our guts can vary to a certain extent at short time frames but there is certain resilience of individual patterns."
Elizabeth Corwin, associate dean of research at Emory University School of Nursing, believes the new research is both "intriguing and comprehensive . " Corwin, who was not involved in the new study, said it indirectly related to her own work with gut microbiomes of pregnant women.
Research has shown that the bacterial composition in the guts of women "adapts during a time of high energy demand – pregnancy – to more efficiently harvest calories from the mother's diet", she explained: "Most women see a return" the non-pregnant state after delivery, suggesting that different types of situations that increase energy use may stimulate changes in microbial composition. "