Table 1.

Po₂mv variables in the spinotrapezius muscle at rest and following the onset of contractions under control and NaNO₂ conditions

	CON	$\mathrm{N}{\mathrm{O}}_2^{-}$
Po2mvBL, mmHg	28.4 ± 1.1	31.6 ± 1.2*
Δ1Po2mv, mmHg	10.5 ± 0.9	12.7 ± 0.8*
Po2mv (steady state), mmHg	18.0 ± 0.9	18.9 ± 1.2
TD1, s	7.0 ± 1.2	6.0 ± 1.6
τ1, s	12.3 ± 1.2	19.7 ± 2.2*
MRT1, s	19.3 ± 1.9	25.6 ± 3.3*
Δ2Po2mv, mmHg	3.4 ± 0.5	2.9 ± 0.1
TD2, s	78.5 ± 22.3	68.9 ± 9.5
τ2, s	67.9 ± 7.7	77.1 ± 14.2
MRT2, s	146.4 ± 25.7	97.3 ± 48.8

Values are means ± SE. Po_2mvBL, resting Po₂mv; Δ₁Po₂mv and Δ₂Po₂mv, amplitude of the first and second components; Po_{2mv(steady state)}, contracting steady-state Po₂mv; TD₁ and TD_2, time delay of the first and second component; τ₁, and τ₂, time constant of the first and second component; MRT₁ and MRT₂, mean response time of the first and second component. Primary components were calculated for all rats (n = 12). Secondary components were present in 3 control (CON) and 2 $\mathrm{N}{\mathrm{O}}_2^{-}$ rats.

^*P ≤ 0.05 vs. CON.