Climbing stamina?

After 3 or 4 hours on a hilly route, I cramp in whatever muscle it is that's just above the knees (both sides together, so it's good to know I'm nicley symmetrical!) This is clearly a climbing muscle as once I'm back on the level I can still work hard without a twitch in this little darling, but as soon as the road goes up I have to ease off otherwise the cramp will return.
If I go out and climb a big hill ot two I'm not even aware that I've got these above-the-knee muscles (do they have a name?) It's got to be a long hilly ride, er, just like a sportive.
I'm a reasonable climber. I can climb seated or standing: it doesn't seem to affect the onset of this cramp.
Okay, other than riding a sportive every week (Mrs MT wouldn't like that) does any one have any tips on building climbing stamina? Specific gym exercises perhaps or cross training?
If I go out and climb a big hill ot two I'm not even aware that I've got these above-the-knee muscles (do they have a name?) It's got to be a long hilly ride, er, just like a sportive.
I'm a reasonable climber. I can climb seated or standing: it doesn't seem to affect the onset of this cramp.
Okay, other than riding a sportive every week (Mrs MT wouldn't like that) does any one have any tips on building climbing stamina? Specific gym exercises perhaps or cross training?
I should get out more (on the bike)
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Is it this one?
Failing that make sure you put a pinch of salt in your water bottle and make sure your well hydrated.
Cramp is more to do with over use of muscles though in extreme heat and dehydration cramp can arise.
I got cramp in a race last week after 55 miles due to the pace of the race as I had not prepared enough so was half expecting to get cramps, as the OP does, mine was quads also.
I wil probably take me another two or three weeks of higher intensity work to prevent this.
I did the Marmotte on a hot day and only used 4 bottles and had no cramp at all, but I was well prepared for that ride
So IMO the OP needs to do higher intensity rides
http://www.youtube.com/watch?v=aK5Bfqj5fxY
you're right, I suppose...;) - but I think there's a bit more to it than that...
muscles are more likely to cramp when they are tired - but mineral deficiency will also play a role. I have cramped in races many times (not so much these days, for some reason), and there was usually plenty of life left in my legs when I got cramp - mainly because I hadn't drunk enough (or enough of the right sort) during or before the race...
I've checked the anatomy diagrams. I'm looking at the vastus lateralis and the vastus medialis - yes, part of the quads.
On reflection, I have neglected higher intensity training this year. After some solid base training, work and family life has got in the way a bit. Some hill reps for me I think.
Yes, I need to look at hydration a bit more seriously too.
MT