Electrocortical activity in fetal sheep in the last seven days of gestation

Journal of Physiology

Volumn 513, Issue 1, 1998, Pages 273-281

  Shinozuka, Norio ^a,b   Nathanielsz, Peter W ^a  

^a Department of Obstetrics Gynecology   (United States)

^b UNIVERSITY OF TOKYO   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

ANIMAL EXPERIMENT; ARTICLE; ELECTROCORTICOGRAPHY; ELECTROMYOGRAM; FEMALE; FETUS; LABOR; NONHUMAN; PREGNANCY; PRIORITY JOURNAL; RHYTHM; SHEEP; UTERUS CONTRACTILITY;

EID: 0032533391     PISSN: 00223751     EISSN: None     Source Type: Journal    
DOI: 10.1111/j.1469-7793.1998.273by.x     Document Type: Article

References (41)

1. BODDY, K., DAWES, G. S., FISHER, R., PINTER, S. & ROBINSON, J. (1974). Foetal respiratory movements, electrocortical and cardiovascular responses to hypoxaemia and hypercapnoea in sheep. Journal of Physiology 243, 599-618.
2. BODDY, K., DAWES, G. S. & ROBINSON, J. S. (1973). A 24-hour rhythm in the foetus. In Foetal and Neonatal Physiology, ed. DAWES, G. S., CROSS, K. W., COMLINE, R. S. & NATHANIELSZ, P. W., pp. 63-66. Cambridge University Press.
3. BRACE, R. A. & MOORE, T. R. (1992). Diurnal rhythms in fetal urine flow, vascular pressures, and heart rate in sheep. American Journal of Physiology 261, R1015-1021.
4. CHALLIS, J. R. G. (1971). Sharp increase in free circulating oestrogen immediately before parturition in sheep. Nature 229, 208.
5. CHALLIS, J. R. G. & LYE, S. J. (1994). Parturition. In The Physiology of Reproduction, 2nd edn, ed. KNOBIL, E. & NEILL, J. D., pp. 986-1031. Raven Press, New York.
6. CLEWLOW, F., DAWES, G. S., JOHNSTON, B. M. & WALKER, D. W. (1983). Changes in breathing, electrocortical and muscle activity in unanaesthetized fetal lambs with age. Journal of Physiology 341, 463-476.
7. DALTON, K. J., GAWES, G. S. & PATRICK, J. E. (1977). Diurnal, respiratory, and other rhythms of heart rate in lambs. American Journal of Obstetrics and Gynecology 127, 414-424.
8. DAWES, G. S. & ROBINSON, J. S. (1976). Rhythmic phenomena in prenatal life. Progress in Brain Research 45, 383-389.
9. DERKS, J. B., GIUSSANI, D. A., JENKINS, S. L., WENTWORTH, R. A., VISSER, G. H. A., PADBURY, J. F. & NATHANIELSZ, P. W. (1997). A comparative study of cardiovascular, endocrine and behavioural effects of betamethasone and dexamethasone administration to fetal sheep. Journal of Physiology 499, 217-226.
10. DERKS, J. B., GIUSSANI, D. A., VAN DAM, L. M., JENKINS, S. L., WINTER, J. A., ZHAO, X. F., HAMMOND, G. L. & NATHANIELSZ, P. W. (1996). Differential effects of betamethasone and dexamethasone fetal administration of parturition in sheep. Journal of the Society for Gynecologic Investigation 3, 336-341.
11. ELLINGSON, R. J. (1972). Development of wakefulness-sleep cycles and associated EEG patterns in mammals. In Sleep and Maturing Nervous System, ed. MAYER, F. E., pp. 165-174. Academic Press, New York.
12. FIGUEROA, J. P., MAHAN, S., POOR, E. R. & NATHANIELSZ, P. W. (1985). Characteristics and analysis of uterine electromyographic activity in the pregnant sheep. American Journal of Obstetrics and Gynecology 151, 524-531.
13. FLETCHER, K. L., LEUNG, K., MYERS, M. M. & STARK, R. I. (1996). Diurnal rhythms in cardiorespiratory function of the fetal baboon. Early Human Development 46, 27-42.
14. GRAPS, A. (1995). An introduction to wavelets. IEEE Computational Science Engineering 2, 60-61.
15. HALBERG, F. (1969). Chronobiology. In Annual Review of Physiology, vol. 31, ed. HALL, V. E., GIESE, A. C. & SONNENSCHEIN, R., pp. 675-725. Annual Reviews, Inc., Palo Alto.
16. HE, Y. (1996). Mathematica Wavelet Explorer. Wolfram Research, Champaign, IL, USA.
17. a,O2 in the fetal lamb: Effects of brainstem section. American Journal of Obstetrics and Gynecology 152, 905-910.
18. HOUGHTON, D. C., WALKER, D. W., YOUNG, I. R. & MCMILLEN, I. C. (1993). Melatonin and the light-dark cycle separately influence daily behavioral and hormonal rhythms in the pregnant ewe and sheep fetus. Endocrinology 133, 90-98.
19. HSU, H. W., FIGUEROA, J. P., HONNEBIER, B. O. M., WENTWORTH, R. & NATHANIELSZ, P. W. (1989). Power spectrum analysis of myometrial electromyogram and intrauterine pressure changes in pregnant Rhesus monkey in late gestation. American Journal of Obstetrics and Gynecology 161, 467-473.
20. O2 in the chronically catheterized fetal sheep. American Journal of Obstetrics and Gynecology 134, 776-783.
21. JOST, R. G., QUILLIGAN, E. J., YEH, S. & ANDERSON, G. G. (1972). Intrauterine electroencephalogram of the sheep fetus. American Journal of Obstetrics and Gynecology 114, 535-539.
22. 2 uptake: continuous measurements during uterine quiescence and contractions. American Journal of Physiology 250, R1099-1107.
23. MCMILLEN, I. C., HORBURN, G. D. & WALKER, D. W. (1987). Diurnal variations in plasma concentrations of cortisol, prolactin, growth hormone and glucose in the fetal sheep and pregnant ewe during late gestation. Journal of Endocrinology 114, 65-72.
24. MAGYAR, D. M., FRIDSHAL, D., ELSNER, C. W., GLATZ, T., ELIOT, J., KLEIN, A. H., LOWE, K. C., BUSTER, J. E. & NATHANIELSZ, P. W. (1980). Time-trend analysis of plasma cortisol concentrations in the fetal sheep in relation to parturition. Endocrinology 107, 155-159.
25. MARTIN, W. & BRINKMANN, K. (1976). Detection and measurement of periodicities in time series. International Journal of Chronobiology 4, 185-196.
26. MATSUDA, Y., PATRICK, J., CARMICHAEL, L., FRAHER, L. & RICHARDSON, B. (1994). Recovery of the ovine fetus from sustained hypoxia: Effects on endocrine, cardiovascular, and biophysical activity. American Journal of Obstetrics and Gynecology 170, 1433-1441.
27. NATALE, R., CLEWLOW, F. & DAWES, G. S. (1981). Measurement of forelimb movements in the lamb in utero. American Journal of Obstetrics and Gynecology 140, 545-551.
28. NATHANIELSZ, P. W., BAILEY, A., POORE, E. R., THORBURN, G. D. & HARDING, R. (1980). The relationship between myometrial activity and sleep state and breathing in fetal sheep throughout the last third of gestation. American Journal of Obstetrics and Gynecology 138, 653-659.
29. 5-steroids in fetal and maternal sheep plasma in relation to spontaneous parturition at term. Endocrinology 110, 1402-1407.
30. NATHANIELSZ, P. W., JACK, P. M. B., KRANE, E. J., THOMAS, A. L., RATTER, S. & REES, L. H. (1977). The role and regulation of corticotropin in the fetal sheep. Ciba Foundation Symposium 47, 73-98. Elsevier, Amsterdam.
31. ROBERTSON, S. S., JHONSON, S. L., BACHER, L. F., WOOD, J. R., WONG, C. H., ROBINSON, S. R., SMOTHERMAN, W. P. & NATHANIELSZ, P. W. (1996). Contractile activity of the uterus prior to labor alters the temporal organization of spontaneous motor activity in the fetal sheep. Developmental Psychobiology 29, 667-683.
32. ROBINSON, S. R., WONG, C. H., ROBERTSON, S. S., NATHANIELSZ, P. W. & SMOTHERMAN, W. P. (1995). Behavioral responses of the chronically instrumented sheep fetus to chemosensory stimuli presented in utero. Behavioral Neuroscience 109, 551-562.
33. RUCKENBUSCH, Y. (1971). Development of sleep and wakefulness in the foetal lamb. Electroencephalography and Clinical Neurophysiology 32, 119-128.
34. RUCKENBUSCH, Y., GAUJOUX, M. & EGHBALI, B. (1977). Sleep cycles and kinesis in the foetal lamb. Electroencephalography and Clinical Neurophysiology 12, 226-237.
35. STARK, R. I. & DANIEL, S. S. (1989). Circadian rhythm of vasopressin levels in cerebrospinal fluid of the fetus: effect of continuous light. Endocrinology 124, 3095-3101.
36. SYMMES, D., PRICHARD, J. W. & MANN, L. I. (1970). Spectral analysis of fetal sheep EEG during hypoxia. Electroencephalography and Clinical Neurophysiology 29, 511-515.
37. SZETO, H. H. & HINMANN, D. J. (1985). Prenatal development of sleep-wake patterns in sheep. Sleep 8, 347-355.
38. SZETO, H. H., VO, T. D. H., DWYER, D., DOGRAMAJIAN, M. E., COX, M. J. & SENGER, G. (1985). The ontogeny of fetal lamb electrocortical activity: A power spectral analysis. American Journal of Obstetrics and Gynecology 153, 462-466.
39. UNNO, N., JENKINS, S. L., WU, W. X., WONG, C. H., BENNETT, P. R. & NATHANIELSZ, P. W. (1997). Effects of maternal administration of nimesulide, a putative prostaglandin (PG) endoperoxide synthase (PGHS)-2 inhibitor on myometrial (MYO) contraction power in sheep during spontaneous term labor (STL). Journal of the Society for Gynecologic Investigation 4 (suppl.), A336P.
40. VISSER, G. H., GOODMAN, J. D. S., LEVINE, D. H. & DAWES, G. S. (1982). Diurnal and cyclic variations in human fetal heart rate near term. American Journal of Obstetrics and Gynecology 14, 505-544.
41. WOUDSTRA, B. R., KIM, C., AARNOUDSE, J. G. & NATHANIELSZ, P. W. (1991). Myometrial contracture-related increases in plasma adrenocortieotropin in fetal sheep in the last third of gestation are abolished by maintaining fetal normoxemia. Endocrinology 129, 1709-1713.