There was that video from a few months ago from... Prints with layers I think? That looked at the actual particulate and volatile counts and found that PLA actually gave off very little? Other plastics were much worse.
So remember that the particle counts matter as much as the danger of the particles.
(Disclaimer, that was a video, not a peer reviewed scientific paper)
It be would be much better if they just showed the number of Wats you are working at, and the total joules of work done at the end of the session. This is probably configurable on most exercise bikes, but calories are much friendlier for the average user.
Lots of the oil exploration ships are custom built for the job. This one is old, but I would guess that there may be some design information regarding it's survey capability that was marked as protected when it was purchased, even if it's not really relevant anymore
Happened to me at uni when I had to walk through it for 20 mins each way