[Noninvasive quantitative determination of the modulus of characteristic impedance of human limb arteries].

A noninvasive method of quantitative evaluation of characteristic impedance modulus of human limb arteries based on blood pressure and blood vessel volume parameters is described. The differences in the value of characteristic impedance modulus in the upper and lower limb arteries in supine and resting subjects have been shown. Under postural effects the impedance changes in the lower limb arteries are proportional to those of mean blood pressure in these vessels. No significant impedance alterations on effort have been observed in these arteries. The impedance of the upper limb arteries increased in passive orthostatic position and after physical exercises of the lower limbs. Characteristic impedance modulus of these arteries decreased after physical exercises of the upper limbs.