you proably arn't eatin right, if i go to the gym in the evening around 5-6 before dinner i get dizzy when i do alot of stuff. But now i work out around 2 so I still have lunch energy. Try eating some peanut butter toast or something.. mmm, if ur not concerend with the fat amount
I've got hypoglycemia, (that's low blood sugar for the simple folk) My body puts out too much insulin during intense activity, (or if I eat candy) which makes me light-headed and sometimes givs me the shakes.
Try eating a light high-carb snack before your workout, so you've got some solid fuel to burn. Keep it light, though so your body's focused on lifting, not digesting.
Never get pulled over with a baggie of whey protein on the passenger seat...
That happens to me sometimes, but ONLY when I do squats followed by deadlifts. The combination of the two exercises just kicks my ass. I've found that a sports drink helps (although some people might cringe at that). You know what else helps? Vomiting. (kidding about the vomiting)
I was talking to our good buddy Cackerot last night on Chat and he figured your problem is due to lack of Oxygen due to the demands of squatting, he cut and Pasted (like only Cack can cut and paste lol) all kinds of info on it and had me convinced anyway.
I asked him why I don't seem to have that problem anymore and basically he told me it was because my muscles have become accustom to lifting more and use less oxygen to do it, therefore no more disyness, made since.
After a heavy weight training set ATP and glycogen are depleted. Oxygen is required to replenish both ATP, glycogen and PC (phosphocreatine) which is a major contributor to momentary muscular failure. To meet these requirements the body need more oxygen, so you breath heavier. If this isn't enough (squats are very damanding), the body will use more of the oxygen to replenish ATP, PC and glycogen so other areas of you body will suffer. This will cause a dizzy/lightheaded feeling.
If the activity that the muscles were doing generated a lot of lactic acid (anaerobic glycolysis mechanism) - such as intense weight training in the 12 rep and above range - then light activity of the muscles during the replenishment period may actually be of benefit. This is because some of the lactic acid would be used to fuel the light activity and, hence, the activity would help clear lactic acid from the muscle. Care must be taken, though, to ensure that this light activity is not intense enough to require the use of the phosphagen or anaerobic glycolysis mechanisms for energy - this would deplete ATP as warned of above.