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Feb 28, 2018 at 13:55 comment added cmaster - reinstate monica Soft-drinks work wonders against bonking, too. Just make sure, you don't accidentally buy the diet stuff (happened to me once, it was not fun...).
Feb 27, 2018 at 8:34 comment added David Richerby @EvilSnack But do have a chat with your doctor, too.
Feb 27, 2018 at 1:39 comment added EvilSnack I'm accepting this answer because food is probably key. I had more water and less food this time. After about another twenty minutes (which is the usual time for glycogen to build back up) I was able to continue without any problems.
Feb 27, 2018 at 1:38 vote accept EvilSnack
Feb 26, 2018 at 15:04 comment added tenebris2020 @ratchetfreak I'd say it's not so sudden. The constricted vessels need some time until they "unfurl", so to say. That's why you have a burning sensation in your legs after you've stood up. This sensation might not be going away for 30 seconds or more.
Feb 26, 2018 at 14:55 comment added ratchet freak @tenebris2020 but a sudden free flow to the legs while the body was trying to pump blood in that direction can decrease the flow to the brain momentarily
Feb 26, 2018 at 12:38 comment added tenebris2020 @Michael A fainting spell is a case of blood flow becoming restricted to the brain, not to the legs. People rarely faint after sitting for a long time in an airplane seat, but they might get DVT. A headrush is possible when standing up (but not while sitting down), and it's about an inner-ear disorder, not about blood flow to anything.
Feb 26, 2018 at 12:08 history edited David Richerby CC BY-SA 3.0
added 36 characters in body
Feb 26, 2018 at 9:02 comment added Michael “I don't think bike fit is really a contributor” I guess it could be if blood flow to the legs is restricted.
Feb 25, 2018 at 21:21 comment added Chris H I suspect that the two things are combined, perhaps with a 3rd, which I'll add as an answer
Feb 25, 2018 at 20:33 comment added Penguino Bonking sounds like a reasonable hypothesis, but if the poster is concerned it is advisable to get a professional assessment from a health professional.
Feb 25, 2018 at 19:50 history answered David Richerby CC BY-SA 3.0