philgoddard Nov 8, 2021:

Good point But I think your first suggestion is more likely - it's about the nature of the subjects (hence "apparently healthy"), not the environment in which the study is carried out.

Alison MacG Nov 8, 2021:

@phil It probably is the answer in this particular example, but it could alternatively be free-living versus controlled or laboratory conditions/studies, etc.
The aim of this study was to compare the outputs of three commonly used uniaxial Actigraph models (Actitrainer, 7164 and GT1M) under both free-living and controlled laboratory conditions.
https://www.tandfonline.com/doi/abs/10.1080/17461391.2011.64...

Ariana Ariana (asker) Nov 8, 2021:

@Alison MacG, thank you

philgoddard Nov 8, 2021:

I think that's the answer, Alison. And thanks to Clauwolf and Orkoyen for their great contributions.

Alison MacG Nov 8, 2021:

One possibility We report a systematic review of randomised controlled trials of physical activity promotion in apparently healthy, free living adults (that is, people who were not receiving treatment for any illness and were not in an institution).
https://jech.bmj.com/content/jech/49/5/448.full.pdf

Orkoyen (X) Nov 8, 2021:

For free-living, my first thought was a bohemian, unrestrained lifestyle. But if this concerns Uzbekistan, carefree might be more apt. Perhaps even unencumbered.