What causes fatigue and light head when running?
I recently replaced running with biking for my workouts. Reason being, I get very light headed and my feet feel the burning sensation quite quickly into my run. After I run (lets say 4 miles), I feel dizzy and my head is not in a very pleasant feeling. I understand the burning sensation in the calves and legs would slowly get better and better with more muscle.
I'm curious as to what causes the fatigue and the light nauseous feeling after running? I had the same thing happen the first time I went on a 10-15mile bike ride, but it only happened once when biking. I get this feeling every time after running.
Feel free to add tags that I'm sure I've missed. Thank you.
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You are probably suffering from dehydration. Four miles is a lot to run, and 15 miles is a lot(for most people) to bike. You can start to sweat after even just a half mile in hot weather or in other heated environments. If you have loss of balance or/and fuzzed vision, that raises the chances of the sole cause being dehydration, too. DRINK PLENTY OF WATER!!!
It could be blood sugar but since its summer it could be a lack of water in combination with heat and the meal sitting in your stomach. It takes some water just to digest your food too. I get nauseous when I run after eating, and usually the afternoon can be the warmest time of the day. Ive learned how to deal with this but usually for longer runs; time-wise. You should start running in the morning if possible when your food is digested and energy stores are ready. Plus breakfast would be right after a run to help balance the blood sugar :)
I don't think you'll get a straight answer on this since the source can be so many things. Here is an example of throwing up that is related to eating and running.
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