Crawlin' up, flyin' down
Join Date: Jan 2006
Location: Democratic Peoples' Republic of Berkeley
Bikes: 1967 Paramount, 1982-ish Ron Cooper,1986 De Rosa Professional, 1978 Eisentraut "A," 1961 BianchiCompetizione, 1994 Trek 520, 199? Burley Bossa Nova, early-1970s Cinelli Speciale Corsa
Sitting and spinning uses less energy than standing up and pushing larger gear, That does not mean you should not stand up at all. On a long climb, it is a not a bad idea every so often to shift up a gear or two and stand up foir a little bit, then sit down, shift back down, and resume your regular pace. This changes the muscles you are using a little bit and lets the one used when sitting to rest a bit.
This all assumes it is a "rhythm" climb, one on which you can fairly easily keep up a reasonable seated cadence for an extended period. On a steeper "power" climb, you do what ya gotta do to get - or what your legs and lungs can tolerate.
"I'm in shape -- round is a shape." Andy Rooney