https://www.jst.go.jp/pr/announce/20230126-3/pdf/20230126-3.pdf
A research team around Kinji Fukuda at Keio University has found that Bacteroides uniformis was abundant in the intestines of Japanese long-distance runners and was associated with their running times. Bacteroides uniformis produces short-chain fatty acids such as acetic acid and propionic acid in the intestine, which may contribute to endogenous glucose production in the liver, thereby improving endurance exercise performance.
It was found that human endurance exercise performance can also be improved by ingestion of α-cyclodextrin, a cyclic oligosaccharide that is readily available to Bacteroides uniformis as a nutrient source.
Keio University: Bacteroides uniformis are abundant in microbiome of Japanese long-distance runners