It’s not like they are trying to treat cancer based on results from a study looking at this data, so getting hung up on the confounders isn’t a big enough hurdle for me to look at the data.
Sure there are limitations as there always are with any study. Results produced in labs (with plenty of attempts to limit confounders) with only 8-10 subjects also have serious limitations.
So we’d be crazy not to let researchers look at this data. I for one would love to know what happens in the fat over forty demographic with Trainerroad!