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Science 24 December 1982:
Vol. 218. no. 4579, pp. 1327 - 1330
DOI: 10.1126/science.7146916
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Articles

Science, Vol 218, Issue 4579, 1327-1330
Copyright © 1982 by American Association for the Advancement of Science

articles

Human fetal movement: spontaneous oscillations near one cycle per minute

SS Robertson, LJ Dierker, Y Sorokin, and MG Rosen

Spectral analysis of spontaneous fluctuations in human fetal movement revealed strong oscillations at frequencies between 0.24 and 0.90 cycle per minute, which are much higher than those of the cyclic alternation of quiet and active states in the fetus and neonate. Oscillations at frequencies up to 2.88 cycles per minute were also detected, but they were usually much weaker. The prominent peaks in the fetal movement spectra are in the frequency range of recently reported neonatal motor rhythms, and indicate the existence of a cyclic process controlling spontaneous motor output that oscillates near one cycle per minute and begins to function in utero.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)