I was watching an interview with Keely Hodgkinson about her prep for the Olympics 800m
She talks about training sessions where she has two reps left to do and she has already gone so hard that she has thrown up and just wants it to be over, but gets back up and does the full set.
Do you go there often, or at all, in your training?
I had a runner I coached (also an 800 runner) that would throw up during really hard workouts. To train for a 2 minute race at such high intensity it happens.
Itās rareā¦ and when I was youngerā¦ but mostly for me it was at the end of longer races. Not pleasant.
I think this is more common with runners. 800s arenāt easy. 
Iāve definitely felt queasy after 3-5 minute VO2s on the bike though.
Iāve thrown up a tiny bit in my mouth during intervals, but never a proper vomit.
Iāve never actually had anything come out, but before my TR days I used to dryheave pretty violently when doing VO2 and anaerobic workouts outside in the Georgia summer heat. The neighbors must have thought I was crazy!
I went through a phase when I would throw up pretty regularly, but also a bit unpredictably, even during easy rides and weightlifting workouts, but mainly rides. It was really weird and frustrating. I may have traced it back to drinking Arizona diet green tea with ginseng, but not totally sure on thatā¦
We have discussed some of this a few years ago
At the moment Zwift races bring me to my absolute limit and I feel nauseous during and after. Itās something I never do during spring/summer and Iām not used to it.
Never on the bike.
Almost always at the end of a running race, no matter the distance. And always right across the finish line in full view of everyone.
Itās been several years since I did, but really hard Anaerobic work would trigger it. Maybe Iām just getting old enough to not desire to go that damn hard any more!
When I was in the Marine Corps, I knew guys that would run outside the gym, hurl, and then get back after it. I was definitely not that guy, and my thoroughly MAMIL body shows it 
Yup.
Still remember the horror of throwing up at the end of the league championship two mile right at the finish. Good news I advanced to regionals. The bad news is it was in front of some cute girls and then they had to delay the meet and bring out a hose to clean the track because it was on the start of the stagger for the 4x400. 
Only time is from track (running) racesā¦and typically the 800 meters
I came really close on the bike 3 years ago at the top of a local HC climb. 65 minutes doing ~345 watts (4.5 w/kg). I was hunched over the bars coughing and gagging but thankfully nothing came up. I definitely felt like I was at my physiological limit at that point
Iāve never been puker, but 30-45sec anerobic intervals, the kind of all out effort where the world start to go dark make me want to pee once the interval ends and the recovery starts. The high intensity causes stimulation of the sympathetic nervous system similar to fight or flight response and when you back of suddenly the parasympathetic bounces back causing the need to pee sensation.
I also suffer from severe post exertional malaise bordering on suicidal depression after these types of workouts, due to the rebound from the adrenalin.
I suffer from getting really cold after hard sessions (probably from sweating too much), even if itās 30C I may have to keep warm with a sweater for half an hour. It goes away once Iām relaxed.
Does eating a couple greasy tacos right before a crit in 100+ heat count? I usually have a pretty bullet proof stomach, but those tacos showed up again a couple times in the first 30 minutes of that crit. Thatās the only time I can remember. But Iāve seen others toss their lunch a few times in bike races. Another reason why positioning is so critical in bike racingā¦
I never have, but have been close.
Especially after my last race this year, went so hard during the race I could only manage 500w for the sprint at the end.
Couldnāt walk after and felt very sick after.
Iāve definitely had this in zwift races or group rides where Iām just trying to hold on no matter what. For me, chasing wheels is a pretty strong motivator. And Iāve had it where I get nauseous during and after and just sit in front of the fan waiting for it to go away
Bit of a conflict here between tales of various track riders and pros going so hard theyāve thrown up during training (and racing, you might reasonably expect that) but yet coaches on social media espousing that you donāt need to go that hard to make progress.
My teenage lad has thrown up on park run before now and doesnāt entirely believe that the way to get faster is to train properly in between times. He sees throwing up as the blocker to going faster rather than any lack of āpracticeā between weekends.
Think what Iām trying to say is training in moderation is still quite effective for most people
I believe these coaches, but I must say there is some kind of special training stimulus when going all out.
At least for me however: During spring/summer I ride a lot outside, which is a lot of slow, medium and sometimes a bit harder riding, even some vo2max intervals sprinkled in. Then in autumn I start Zwift racing and I get so so strong. I usually beat my power-PRs, from 5min to 60min.
But it takes me multiple days to recover, maybe a week till being fully back. And I know itās probably the combination of volume + intensity. I just think really hard efforts have their place somewhere. 
(And maybe I should do more intervals in summer.)
I havenāt had this happen on the bike, but during intense circuit style strength sessions Iāve had those sensationsā¦Iām pretty sure itās like an intense adrenaline response that causes nausea. Back in my high school days during conditioning after football practice Iād sometimes puke. Probably because I was just in bad shape and couldnāt take it very well.