Table 1.

Subject characteristics, physical performance, and whole muscle size and function before and after 12 wk of aerobic training in young and older men

	Young Men (n = 7)			Older Men (n = 6)
	Pre	Post	%Δ	Pre	Post	%Δ
Subject characteristics
Age‡, yr	20 ± 1			74 ± 3
Body weight, kg	85 ± 4	84 ± 4	N/A	82 ± 4	81 ± 1	N/A
Graded exercise test
Aerobic capacity†‡#, l/min	3.4 ± 0.2	3.9 ± 0.2	16 ± 2	1.8 ± 0.1	2.0 ± 0.1	13 ± 3
Maximum heart rate‡, beats/min	199 ± 1	194 ± 2	N/A	146 ± 5	149 ± 7	N/A
Peak workload†‡, W	261 ± 12	313 ± 13	20 ± 2	143 ± 6	172 ± 9	21 ± 6
Whole muscle
Quadriceps volume†, cm3	1,052 ± 62	1,101 ± 64	5 ± 1	930 ± 28	984 ± 24	6 ± 1
Knee extensor power‡, W	925 ± 74	955 ± 81	N/A	509 ± 45	522 ± 57	N/A

Values are means ± SE; n, no. of subjects. Pre, before training; Post, after training; Δ, change; N/A, not applicable. P < 0.05, main effect for

^†time,

^‡group, and

^#interaction.