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that experimenters asked people to exercise. Where are you reading this? The article is about the meta review here http://bjsm.bmj.com/content/early/2017/03/30
by acchow 10y ago
that experimenters asked people to exercise.
Where are you reading this? The article is about the meta review here http://bjsm.bmj.com/content/early/2017/03/30/bjsports-2016-096587 http://bjsm.bmj.com/content/early/2017/03/30/bjsports-2016-0...
Even if you're right, it still doesn't remove the confounding factors. Let's assume you're right and each study has a control group that doesn't exercise (for.... x years...? seems ridiculous) and an experimental group which exercises regularly. But then...unhealthy people wouldn't be able to be in the latter group because they can't exercise regularly.
I humbly submit "healthiness" as a possible confounding factor contributing to both "sharp mind" and "ability to exercise" (and thus be in the experimental group). Not sure where healthiness would come from - genetics? Diet? Less stress?
- deleted 10y ago[deleted]
- sooheon 10y agoI'm reading this in the same place you linked. It's a meta study of experimental studies, where experimenters ask otherwise sedentary people to be subject to "exercise interventions" (it's in the title...). Observations weren't for years AFAIK, studies over 4 weeks were eligible and an effect was observed. Edit: as for your confounding effect, it doesn't strike at the heart of the study. The study finds that actually doing exercise improves your cognitive function. Not that there are "sharp" people and "active" people and these tend to go together. Whether or not you're sharp or healthy to begin with, doing "exercise intervention" will improve your cognition.