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Yeah, but:

> None of the participants had used a treadmill desk before, so they received a few minutes of instruction and practice

A few minutes? Jeez, I'd expect that getting acclimated to a completely different way to work would take at least several weeks or months.

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Fair enough, I guess. This still lowers my expectation that there is a significant positive improvement in the long term, and is strong evidence against the sort of anecdotal claims that "you immediately feel better and more alert" that I hear all the time.

But this only looks at walking while doing another task. How about a short walk and then sitting for the test?

I think something else that could have impacted their results is that for some people, the knowledge that they are being tested changes the way they think/perform quite drastically. When I sit at a desk and do menial work, I get restless and my productivity plummets. But if you tell me that I'm being assessed, and you give me a straightforward task, I will have no trouble focusing on it for at least an hour. Maybe treadmill desks help you stay on task, but at the same time inhibit your cognitive performance slightly.

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