Lightheaded... even at 135 lbs ?!? Sleep Study Update

Medical Q&A [Moderated]
1

How would you correct being lightheaded after performing conventional deadlifts and or bent over row even if the weight is 135? Sumo stance does not make me as lightheaded (I almost blacked out and did not realize where I was for a couple of seconds, no exaggeration), even just practicing the 5 step for conventional makes me slightly lightheaded while holding an imaginary barbell (I brace hard and pretend I am actually holding a heavy barbell)
I could have missed the bracing portion in the video posted by Alan regarding the 5 step, but I brace in step 4 while lifting the chest. When would it be ideal to brace?
Squats, Bench, OHP, do not make me lightheaded even after a heavy set, fully braced, and wearing a very snug belt that gets tighter the harder I brace.

I do have asthma which is controlled very well by Advair and possible sleep apnea for some basic history.
I eat a good amount carbs throughout the day and even drink coconut water with creatine preworkout.

Sleep Study Update.
The second at home study had failed. According to the sleep doc, my nasal congestion was completely blocked that it only recorded about half an hour of data. Because of the nasal blockage and mouth breathing, the ApneaLink Air had thought the tube that connected from the box to my nose was disconnected and no longer took any more data.
Although I have been taking the nasal spray he has prescribed me (I can inhale through my nose a bit better throughout my day, even in my bedroom (so to say my room is dirty and not clean is invalid, I keep it fairy clean coupled with a HEPA air filter)) he is now questioning if I have nasal polyps or not.
He also recommends me taking an in lab study and seeing an ENT Doctor.
What is your opinion on this?

You think I could have some adrenal fatigue coming from the mouth breathing sleep?

Thanks Doctor.

2

It sounds like you’re breathing incorrectly from here with respect to the deadlift and the bent row (neurally mediated syncope) or some other syncopal cause. I cannot tell you from here without evaluating you, but the bracing and breathing you’re describing sound like they might be contributing. Try taking a smaller breath and squeeze the slack out of the bar, but down’t try and bear down as hard as you can. I think people can go down the wrong path there. Don’t think about bracing anymore. Take a big (not not maximal) breath in and hold it.

I don’t think asthma or dietary contributions to this are likely given that it does not happen with other movements.

I have no contrary opinion on your existing doctor’s recommendation to be evaluated with an additional sleep study and seeing the ENT about the nose. Since adrenal fatigue is not a real diagnosis and you only have 30 minutes of sleep data to go off of, I would confidently say you don’t have adrenal fatigue and I’m not sure what to make of your nose without an examination.