Table 2.

Characteristics of soleus muscle feed arteries from young and old rats used in the exercise training study

Parameter	Con	l-NNA	Indo	l-NNA + Indo
Maximal diameter, μm
Young Sed	199±5	193±7	195±11	180±13
Young Ex	196±12	178±16	191±12	184±15
Old Sed	170±8	173±10	174±17	187±12
Old Ex	200±10	194±8	171±11	171±10
Initial tone, %
Young Sed	48.6±4.1	73.9±2.8a,c,d	45.3±6.9b	57.6±4.5b
Young Ex	40.1±4.3	60.4±4.7a,c	34.4±4.1b,d	54.7±6.1a,c
Old Sed	44.0±6.4	67.5±5.2a,c,d	32.0±4.0b	45.6±4.9b
Old Ex	46.4±3.9	55.8±4.9c,d	33.4±2.3a,b,d	44.1±2.7b,c

Values are means ± SE; n = 8–10 rats/group. Con, control; l-NNA, N^ω-nitro-l-arginine; Indo, indomethacin. Significantly different from

^aCon,

^bl-NNA,

^cIndo,

^dl-NNA+ Indo, P ≤ 0.05.