What happens in a day at the roller derby? For one thing, scientists have discovered and reported Tuesday in the journal PeerJ, a lot of bacteria get swapped around.
To learn why they did so and what they discovered, the Times spoke with research leader James F. Meadow and center director Jessica Green, who used to compete in the roller derby as "Thumper Biscuit."
(The researchers are working with filmmaker Tristan Wheelock on a film called "Talk Derby To Me." A rough cut of the trailer is available here on Tumblr, and embedded below.)Why study the microbiome?
Jessica Green: People really don’t know where we get our microbes from. We don’t know if they’re predetermined from genetics. We don’t know if we get them from our mothers when we’re born. We don’t know if we pick them up from everything we touch in a building, or from the people we spend time with.
How does roller derby fit into this?
Green: I skated for three years on the Emerald City Roller Girls — I was on a team in the league called the Flat Track Furies. During that time I really was thinking a lot about the way that being in community with a group of people affected your health and well-being. I wondered about the things we were sharing that you couldn’t see. I started envisioning a link between what I was doing with my free time and what we were doing with the center.
How did you do this study?
James Meadow: We looked at three teams — one from Washington, D.C., one from the Bay Area and one from Eugene, Ore. — and we swabbed their upper arms to collect samples. Then we took the DNA, sequenced the bacteria that were in there, and tried to find out how similar those communities were before and after the bout, which lasted about an hour.
One of the interesting things is that teams from different geographic locations in the country started out looking quite different.
Was that surprising?
Meadow: We did expect to see something there, but we didn’t expect it to be so clear-cut. We could have taken one player at random before they played against each other, and I could have told you which team she’d played for with pretty good confidence, just by looking at bacteria on the upper arm.
But then after they had played against one another that became a lot more difficult, because there was a lot more in common.
What were the bacteria that you saw?
Meadow: There were thousands. We used the DNA to get a census of who was in there. We didn’t really find anything in these samples that was all that surprising. There were a lot of bacteria associated with the skin and with our mouths. But there were also environmental bacteria from soils and plants and things that you find floating around in the air. It was sort of a mix of all these things, and it helps us to understand where some of them might come from.
What do these bacteria do on the human skin?
Meadow: We were really looking at who was there — not necessarily what they do. But many of the bacteria we found were associated with functions. For example, we found one that has been studied for its role in foot odor. It’s something that we all carry around.
You wrote in the PeerJ study that you think the bacteria moved between the roller derby competitors through direct contact.