Fig. 7.

Compilation of the literature for the quadriceps muscle volume (top) changes with aging [n = 204: 89 young (23 yr), 115 old (74 yr), 101 men, 103 women] (27, 40, 42, 64) and triceps surae muscle volume (bottom) changes with aging [n = 101: 50 young (28 yr), 50 old (75 yr), 76 men, 25 women] (4, 12, 45, 52). Data from the current investigation are included for comparison. Lit, literature; OH, old healthy; LLE, lifelong exercisers; W, women; M, men. OH reflects combined data from the M and W [n = 40: 20 young (25 yr), 20 old (75 yr), 20 men, 20 women.]