Just wondering if anyone had some advice on what might be causing my
headaches after long runs. In general, I wind up with a somewhat
incapacitating headache several hours after I finish a long run--I'm
currently working on building up for the LA marathon, so I'd like to take
care of the problem before the runs get much longer. The headaches are
consistent with what occured the last time I was training for the LA
marathon (back in 2000) and they increased in severity as the long runs
approached the 20 mile mark.
My first thought about this was that it must be a dehydration issue, but
that seems to have not panned out. I'm guessing that drinking enough water
to have clear urine and a need to urinate about once an hour is sufficient
to prove that I've got enough water in me.
So, a few things have come to mind as possibilities:
1. Hyponatremia--If I consume something salty after a run, this should test
whether the headache is due to a salt deficiency, but how much salt would I
have to eat? So far, eating something moderately salty (pretzels, chips,
etc) doesn't have an impact on the headaches.
2. I drink coffee, generally 2-3 cups per day, and I keep that consistent
on my long run days. Is it possible the increase in aerobic work could be
causing the caffeine to metabolize more rapidly, or in someway differently?
If so, is it possibly I'm basically getting a caffeine withdrawal headache?
3. I have borderline high blood pressure, generally in the 130-140/80-90
range, and aerobic exercise is shown to reduce blood pressure some time
after the end of exercise. Is it possible a transient drop in blood
pressure that's occuring is causing the headaches?
4. Could it be a simple calorie deficiency? While I by no means restrict
my calorie intake, long runs do demand a significant amount of calorie burn
that I'm not getting on other days of the week.
Thanks,
Drew