Frequency response characteristics of sympathetically mediated vasomotor waves in humans.
نویسندگان
چکیده
In a recent study, we demonstrated that transmission from peripheral sympathetic nerves to vascular smooth muscles is strongest in the frequency band from 0.2 to 0.5 Hz in conscious rats. In contrast, sympathetic modulation of vasomotor tone in humans is suggested to be reflected in the power spectrum of arterial blood pressure in a frequency range centered around ∼0.1 Hz. Therefore, we addressed whether frequency response characteristics of sympathetic transmission from peripheral sympathetic nerves to vascular smooth muscles in humans differ from those in rats. In 12 male subjects, skin-sympathetic fibers of the left median nerve were electrically stimulated via microneurography needles with stimulation frequencies ranging from 0.01 to 0.5 Hz. Simultaneously, blood flow in the innervated skin area at the palm of the ipsilateral hand was recorded by a laser-Doppler device. The skin blood flow in the same area of the contralateral hand was recorded as a control. Median nerve stimulation produced transient decreases in skin blood flow in the ipsilateral hand. At frequencies ranging from 0.025 to 0.10 Hz, median nerve stimulation evoked high-power peaks at the same frequencies in the skin blood flow power spectra of the ipsilateral but not of the contralateral hand. The greatest responses were found in the frequency range from 0.075 to 0.10 Hz. Therefore, these data indicate that the transmission from peripheral sympathetic nerves to cutaneous vascular smooth muscles in humans is slower than in rats. In addition, the frequency range believed to be most important in sympathetic modulation of vasomotor activity in humans corresponds to the frequency band of the greatest response of cutaneous vascular smooth muscle contraction to sympathetic nerve stimulation.
منابع مشابه
AREGU August 46/2
Stauss, Harald M., Jens-Ulrich Stegmann, Pontus B. Persson and Heinz-Joachim Häbler. Frequency response characteristics of sympathetic transmission to skin vascular smooth muscles in rats. Am. J. Physiol. 277 (Regulatory Integrative Comp. Physiol. 46): R591–R600, 1999.—Sympathetic modulation of cutaneous vasomotor waves in humans is most effective at frequencies up to 0.1 Hz. In contrast, sympa...
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ورودعنوان ژورنال:
- American journal of physiology. Heart and circulatory physiology
دوره 274 4 شماره
صفحات -
تاریخ انتشار 1998