Journal of Applied Physiology Journal of Applied Physiology
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J Appl Physiol 88: 369-372, 2000;
8750-7587/00 $5.00
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Vol. 88, Issue 2, 369-372, February 2000

Human calf microvascular compliance measured by near-infrared spectroscopy

T. Binzoni1, V. Quaresima2, M. Ferrari2, E. Hiltbrand1, and P. Cerretelli3

1 Departments of Physiology and Radiology, Faculty of Medicine, University of Geneva, 1211 Geneva 4, Switzerland; 2 Department of Biomedical Sciences and Technologies, University of L'Aquila, I-67100 L'Aquila; and 3 Istituto di Tecnologie Biomediche Avanzate, Consiglio Nazionale delle Ricerche, I-20090 Segrate (MI), Italy

The purpose of this study is to develop a new method for the measurement in humans of the compliance of the microvascular superficial venous system of the lower limb by near-infrared spectroscopy (NIRS). This method is complementary to strain-gauge plethysmography, which does not allow compliance between deep and superficial venous or between venous and arterial compartments to be distinguished. In practice, hydrostatic pressure (P) changes were induced in a calf region of interest by head-up tilt of the subject from alpha  = -10 to 75°. For P <=  24 mmHg, the measured compliance [0.086 ± 0.005 (SD) ml · l-1 · mmHg-1] based on NIRS data of total, deoxygenated, and oxygenated hemoglobin, reflects essentially that of the superficial venous system. For P >=  24 mmHg, no distinction can be made between arterial and venous volumes changes. However, by following the changes in oxy- and deoxyhemoglobin in the P range -16 to 100 mmHg, it appears to be possible to assess the characteristics of the vasomotor response of the arteriolar system.

venous compliance; muscle; distensibility


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Modeling oxygenation in venous blood and skeletal muscle in response to exercise using near-infrared spectroscopy
J Appl Physiol, June 1, 2009; 106(6): 1858 - 1874.
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