Table 2.

TTIs during static contraction

		TTI, kg·s
	n	Before	After
Freely perfused group
Intra-arterial DAMGO	8	24.8 ± 3.6	24.3 ± 3.9
Intravenous DAMGO	6	19.6 ± 1.5	18.7 ± 1.7
Intra-arterial saline	6	17.4 ± 2.1	17.3 ± 2.2
72-h occluded group
Intra-arterial DAMGO	10	26.8 ± 1.9	23.2 ± 1.7
Intravenous DAMGO	6	22.0 ± 1.7	18.3 ± 2.0
Intra-arterial saline	6	23.5 ± 1.9	20.2 ± 4.2
Intra-arterial naloxone and DAMGO	7	28.8 ± 2.7	27.7 ± 3.0

Values are means ± SE; n, no. of rats/group. TTI, tension-time index.