Most people experience this reaction after performing a set of deadlifts or squats at some point during weight training. Blurred vision, light headedness, seeing spots, blackouts, vomit, and visions of hot women are common occurrences after heavy compound lifts. You may be worried that you may pass out and you rightly should be. No one wants to either pass out mid lift or pass out and smoke your face on some dumbbells, like this guy.
Before lifting take some deep breathes to get the oxygen flowing and make sure that you are doing some warm up lifts of lesser weight to get your blood flowing. Once you are warmed begin breathing slowly during your concentric movements. This will help keep the oxygen flowing throughout the lift. Too many times weight lifters will hold their breath to the bottom of a squat or deadlift to tighten their stomach and back. This can cut off a lot of oxygen and result is being fairly dizzy afterwards.
You may have to try varying your breathing to find what works best for your body. If slow breathing doesn’t help you can try taking a big breath before the lift or ¾ of a big breath then exhale has you lower your deadlift or rise from your squat.
Sometimes, depending on how much weight you are lifting, it can be unavoidable. You will get dizzy and see stars. Just man up or woman up and swallow the vomit that may come up. In the ultimate goal of building strength there is going to be some tough lifts and side effects to fight through.
If you train with a buddy make sure to let them know that you have been getting dizzy or light headed from big lifts. This can help make them more aware when spotting to possibly catch you if you start to fade to the floor or catch that plate to the face. Hey you wanted a cool scar right?