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- W1980593527 abstract "Abstract Red cell velocity in capillaries of resting sartorius muscle in frogs was measured by means of a television-computer method. The velocity, represented in a digital form, was transferred from the time domain into the frequency domain by means of the Fourier transform. In this way, both the periods and amplitudes of periodic components in the velocity could be measured accurately. The Fourier transform analysis revealed that, in the range of periods from 0.7 sec to 25 min, the only significant periodic variation of the velocity was that related to the heart beat. The period of this variation was defined as the pulsatility period and, in the range of 0.7 to 3.4 sec, this was practically identical to the heart beat period (measured independently of the velocity). The average amplitude of the pulsatile component was ±24% of the mean velocity. Even though the visual analysis of some velocity records suggested the presence of variations with longer periods, the Fourier analysis indicated that these periods were not constant. We conclude that, in the capillaries of resting sartorius muscle in frogs, two types of velocity variations occur: (i) pulsatile variations caused by the pumping action of the heart, and (ii) superimposed nonperiodic fluctuations. On the assumption that these fluctuations are caused by the activity of precapillary sphincters and/or arteriolar smooth muscle, our results indicate that such activity is irregular and nonperiodic." @default.
- W1980593527 created "2016-06-24" @default.
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- W1980593527 date "1980-07-01" @default.
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- W1980593527 title "Fourier transform analysis of periodic variations of red cell velocity in capillaries of resting skeletal muscle in frogs" @default.
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- W1980593527 doi "https://doi.org/10.1016/0026-2862(80)90015-1" @default.
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