Table 2.

Exercise training histories

	Young Exercisers (n = 10)	Lifelong Exercisers (n = 7)	Old Healthy Nonexercisers (n = 10)
Total training years	5 ± 1	48 ± 2	—
Lifetime average
Frequency, days/wk	—	4.6 ± 0.3	—
Duration, h/wk	—	6.6 ± 0.6	—
Intensity*	—	1.9 ± 0.1	—
Current decade
Frequency, days/wk	5.4 ± 0.5	4.7 ± 0.4	—
Duration, h/wk	7.3 ± 1.1	6.8 ± 1.0	—
Intensity*	2.6 ± 0.1	2.1 ± 0.2	—

Values are means ± SE. Lifetime average reflects current decade exercise habits for young exercisers.

^*Levels of self-reported training intensity were 1 (light), 2 (moderate), and 3 (hard). In the case that a subject reported >1 training intensity, values were weighted and averaged (e.g., 80% of training at a 2 and 20% of training at a 3 resulted in an overall intensity of 2.2). More detailed exercise training histories are presented by us elsewhere (20).