WTH? Every once in awhile, one of my feet will go numb during a run. I've noticed that it seems to happen when my lower legs are feeling fatigued. My laces are loose, more so then usual. It goes away when I stop to shake it out or take the shoe off, but I have no idea why this happens and how to prevent it. Any clue why?
I have the same problem in some training and races. In a half it hits right at the 10k for some reason, then it goes away sometime over the next mile. When this occurs I generally haven't been strecthing enough in my lower legs. My guess is that the muscles are tight and constrict the blood vessels. A little extra stretching seems to solve my problem.
I have the same problem every so often and have found stretching the calves and achilles helpful. Although, sometimes I'm forced to stop, take the shoe off, shake the foot for a while then continue the run.
Sometimes it can be the looseness that does it-- friction. I get that problem a LOT with new shoes or with orthotics. If you're running sluggishly rather than pushing off briskly, you're probably creating a lot more slippage.
could be compartment syndrome
Google "pernicious anema" to see if you have any indications.
Pernicious anemia probably affects many runners that end up in a "funk".The red blood cell count is actually low but goes undetected because each cell is bloated and takes up more space. The white cell count is low and may be the easiest indicator that another test is necessary. The feet and/or hands may go numb, the heart races at night, and some have trouble sleeping. You could get tested for the IF factor. This is a compound that carries B12 from the stomach to the intestine where the B12 is absorbed.A lack of IF could indicate a B12 deficiency. B12 is cheap and is best absorbed under the tongue.
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