Hey Chopper,

You're not alone in finding that running tends to decrease the frequency of your CH.  The best explanation for this phenomenon likely rests with the fact that a good cardiovascular workout tones the cardiovascular system and improves lung functions.

As arterial carbon dioxide (CO2) buildup and low oxygen levels tend to favor the cluster headache triggering mechanism, anything that improves the O2 - CO2 exchange in the lungs works in your favor.  It's still anecdotal at this point but it also appears a toned up vascular system is also more resistant to the CH triggering mechanism.

I've also found a diet high in alkaline forming and anti-inflammatory foods tends to reduce the frequency of my attacks as well.  A diet like this also tends to make oxygen therapy at flow rates that support hyperventilation more effective with much shorter abort times.

Take care,

V/R, Batch