Figure 2
From: Evidence that large vessels do affect near infrared spectroscopy
(a) Average response to slow venous occlusion of the cross-sectional area of the basilic vein (green) and of tHb and THI as detected on the muscle (red) and on the vein (blue). Shaded areas represent the 95% confidence interval of the mean. The black trapezoid depicted in the top graph qualitatively reproduces the cuff pressure during inflation to 60 mmHg, plateau and subsequent deflation to 0 mmHg, while the vertical dashed lines indicate end of inflation (first one) and beginning of deflation (second one). (b) Peak response of blood volume indexes, collected from vein and muscle probes (top), Pearson’s coefficient of the correlation between changes in BV cross-sectional area and in blood volume indices (bottom). *p < 0.05; #p < 0.01.
