Table 3.

Quadriceps and triceps surae muscle size

				Men
	Women				Lifelong Exercisers
	YE	LLE	OH	YE	Combined	LLE-P	LLE-F	OH
Quadriceps CSA (cm2)	59 ± 2*	42 ± 2	40 ± 1	78 ± 3*	67 ± 2†	68 ± 2	65 ± 3	56 ± 3
Quadriceps volume (cm3)	920 ± 45*	620 ± 31	543 ± 37	1,264 ± 71*	1,050 ± 38†	1,021 ± 46	1,106 ± 64	868 ± 58
Triceps surae volume (cm3)	464 ± 39*	321 ± 25	317 ± 28	548 ± 30	466 ± 17	468 ± 19	461 ± 34	476 ± 34

Values are means ± SE. CSA, cross-sectional area; YE, young exercisers; LLE, lifelong exercisers; LLE-P, LLE-performance; LLE-F, LLE-fitness; OH, old healthy nonexercisers. Triceps surae CSA was not presented because no measurements of function or quality were assessed.

^*P < 0.05 vs. main groups;

^†P < 0.05 vs. OH.