Triathlon - quad cramps

I had severe quad craps in both legs about 5 min. into my run-leg yesterday. Both quads locked up and I almost stopped to try to stretch them out. Another runner advised me to work through it, and they finally let up a few minutes later. Today they are extremely soar.

Anyone have some theories how I could prevent this in the future? Would a different bike geometry help? It was a very hilly bike course. Would potassium or any other nutrition help?

I have the same problem. Normally for me it's about the last mile or so. I feel like my quad muscles are going to explode out of my skin. But I stop and start a lot on the run.

My guess is since I'm on a road bicycle and not triathlon bike that I'm using my quad muscles more than I would on a tri-bike. I also put more effort into my road cycling since it's my strong point in a triathlon. I shouldn't knowing it'll hurt me in the run but after my sucky swim I can't stop myself from hauling ass on the bike ride.

One possible solution is to massage your legs more. I find as I increase the amount of running I do, my legs turn into a tight mess and some muscles are highly resistant to the concept of relaxing. Since I don't have a live-in masseuse, I use a foam roller (http://www.amazon.com/GoFit-6-Inch-18-Inch-Roller-Performance/dp/B0007W2FEU/ref=sr_1_5?ie=UTF8&s=sporting-goods&qid=1245030417&sr=8-5).

Try Thermolytes.