Our expert says:
This sounds like a blood sugar or pressure problem. In terms of Blood pressure, it is more likely it's low BP at the time of fainting, though it's interesting that it was that high afterwards. That would tell me that it's not a BP problem - just so you know though, people often black out because their BP is TOO LOW. Doesn't seem to have been the case here.
Therefore, I'm thinking diet. Maybe what has happened is that you're eating too close to training. What that does is "trick" your body into wanting to digest and absorb that food, and then when you start exercise, it's in the wrong "mode". That can, strangely enough, mean that your blood sugar levels precisely BECAUSE you've eaten too soon before exercise. Don't want to go into the physiology of this, but hopefully it makes some sense. The trick is to eat before training, but not so close to training that you cause this little "error" to be made by your body.
So rather than eating less, maybe the trick is that you ate too close, and just eating say 45 to 60 minutes before would prevent it.
The other thing at play here is that it happened on your first training session ever. So therefore, I'd say you might wish to just have a medical and make sure that all is OK. I don't wish to alarm you, but it's a good safety measure to just check out that nothing associated with the heart is causing this, because it could be. I doubt it and your quick recovery is a sign that it's nothing super serious, but you never know, and it's obviously better safe than sorry.
So that's something to consider. But also look at the diet, and look how hard you're training. Did you overdo it? Is it going to happen again? Obviously, you'll train with some trepidation in future, but it might have been an isolated incident, nothing serious. Let's hope so, but consider that medical and also the energy aspect for the future.
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