Table 3.

Near-infrared spectroscopy tissue saturation index (TSI) variables of the gastrocnemius during post-contraction intermittent arterial occlusion. Mean and range of the saturation nadir (TSI_LOW, %) and relative peak muscle oxygen consumption ( ${\mathrm{m}\dot{\mathrm{V}}\mathrm{O}}_{\mathrm{2}}$, %.s⁻¹) during repeated tests in smokers with and without COPD.

	1st repetition		2nd repetition		CV
	TSILOW %	${\mathbf{m}\dot{\mathbf{V}}\mathbf{O}}_{\mathbf{2}}$ % s−1	TSILOW %	${\mathbf{m}\dot{\mathbf{V}}\mathbf{O}}_{\mathbf{2}}$ % s−1	TSILOW %	${\mathbf{m}\dot{\mathbf{V}}\mathbf{O}}_{\mathbf{2}}$ %
COPD	47.5 (30.4 – 65.9)	1.38 (0.66 – 3.18)	46.7 (26.2 – 65.2)	1.51 (0.37 – 3.74)	3.92	16.11
CON	47.4 (6.5 – 67.8)	1.71 (0.20 – 10.60)	42.2 (12.6 – 69.8)	1.49 (0.20 – 6.55)	5.25	17.65

Data are mean (range). CON = controls; TSI_LOW = lowest value reached by tissue saturation index during the arterial occlusions series; ${\mathrm{m}\dot{\mathrm{V}}\mathrm{O}}_{\mathrm{2}}$ = muscle oxygen consumption