This was a good question and I'm a little disappointed to see no reply. However, I'll share mine in case it helps someone else. It might seem counterintuitive, but the answer is simple: disengage. You still a break whether to breath and do some quick floor yoga or, of course, work on a more pressing project that requires your undivided time to think. Determine what's the priority on which you need to focus and let that be your guide. You can always follow-up, if you like, with the person/group that set the meeting up for a recap. Preferably, plan ahead if you think you won't attend and that way you can give the courtesy upfront that you would still like to be included for any recaps or action items. Re-engage when you’re ready. Hope this helps.