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. 1996 Mar;30(1):32–35. doi: 10.1136/bjsm.30.1.32

Maternal rectal temperature and fetal heart rate responses to upright cycling in late pregnancy.

M E O'Neill 1
PMCID: PMC1332262  PMID: 8665115

Abstract

OBJECTIVE--To assess maternal rectal temperature and fetal heart rate responses to dynamic exercise. METHODS--11 healthy women with low risk pregnancies completed three separate upright cycling tests at 34 to 37 weeks gestation: 15 min at 62.5 W (mean maternal heart rate [MHR] 138 beats.min-1 (test A); 15 min at 87.5 W (MHR 156 beats.min-1) (test B); and 30 min at 62.5 W (MHR 142 beats.min-1) (test C). Rectal temperature and fetal heart rate were measured. RESULTS--Mean temperature increase after tests B and C [by 0.4(SD 0.1) degrees C] was greater than after test A [0.2(0.1) degrees C] (P < 0.001). Fetal heart rate, measured in the recovery period immediately after exercise, increased significantly only after tests B and C (P < 0.01). Exercise related changes in temperature and fetal heart rate weakly correlated in tests B (P < 0.02) and C (P < 0.01). CONCLUSIONS--Temperature and fetal heart rate changes were more marked after higher intensity (test B) or longer duration exercise (test C) compared with moderate exercise, but none of the tests caused adverse fetal heart rate changes (decrease in accelerations, bradycardia, or decelerations) or individual temperatures above 38 degrees C.

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Selected References

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  1. Artal R., Rutherford S., Romem Y., Kammula R. K., Dorey F. J., Wiswell R. A. Fetal heart rate responses to maternal exercise. Am J Obstet Gynecol. 1986 Oct;155(4):729–733. doi: 10.1016/s0002-9378(86)80008-4. [DOI] [PubMed] [Google Scholar]
  2. Bell A. W., Wilkening R. B., Meschia G. Some aspects of placental function in chronically heat-stressed ewes. J Dev Physiol. 1987 Feb;9(1):17–29. [PubMed] [Google Scholar]
  3. Bell R., O'Neill M. Exercise and pregnancy: a review. Birth. 1994 Jun;21(2):85–95. doi: 10.1111/j.1523-536x.1994.tb00240.x. [DOI] [PubMed] [Google Scholar]
  4. Carpenter M. W., Sady S. P., Hoegsberg B., Sady M. A., Haydon B., Cullinane E. M., Coustan D. R., Thompson P. D. Fetal heart rate response to maternal exertion. JAMA. 1988 May 27;259(20):3006–3009. [PubMed] [Google Scholar]
  5. Clapp J. F., 3rd, Little K. D., Capeless E. L. Fetal heart rate response to sustained recreational exercise. Am J Obstet Gynecol. 1993 Jan;168(1 Pt 1):198–206. doi: 10.1016/s0002-9378(12)90914-x. [DOI] [PubMed] [Google Scholar]
  6. Clapp J. F., 3rd The changing thermal response to endurance exercise during pregnancy. Am J Obstet Gynecol. 1991 Dec;165(6 Pt 1):1684–1689. doi: 10.1016/0002-9378(91)90015-j. [DOI] [PubMed] [Google Scholar]
  7. Erkkola R. U., Pirhonen J. P., Kivijärvi A. K. Flow velocity waveforms in uterine and umbilical arteries during submaximal bicycle exercise in normal pregnancy. Obstet Gynecol. 1992 Apr;79(4):611–615. [PubMed] [Google Scholar]
  8. Fortney S. M., Vroman N. B. Exercise, performance and temperature control: temperature regulation during exercise and implications for sports performance and training. Sports Med. 1985 Jan-Feb;2(1):8–20. doi: 10.2165/00007256-198502010-00002. [DOI] [PubMed] [Google Scholar]
  9. Hauth J. C., Gilstrap L. C., 3rd, Widmer K. Fetal heart rate reactivity before and after maternal jogging during the third trimester. Am J Obstet Gynecol. 1982 Mar 1;142(5):545–547. doi: 10.1016/0002-9378(82)90758-x. [DOI] [PubMed] [Google Scholar]
  10. Jonson K. M., Lyle J. G., Edwards M. J., Penny R. H. Effect of prenatal heat stress on brain growth and serial discrimination reversal learning in the guinea pig. Brain Res Bull. 1976 Jan-Feb;1(1):133–150. doi: 10.1016/0361-9230(76)90056-3. [DOI] [PubMed] [Google Scholar]
  11. Lotgering F. K., Gilbert R. D., Longo L. D. Exercise responses in pregnant sheep: oxygen consumption, uterine blood flow, and blood volume. J Appl Physiol Respir Environ Exerc Physiol. 1983 Sep;55(3):834–841. doi: 10.1152/jappl.1983.55.3.834. [DOI] [PubMed] [Google Scholar]
  12. McMurray R. G., Katz V. L., Meyer-Goodwin W. E., Cefalo R. C. Thermoregulation of pregnant women during aerobic exercise on land and in the water. Am J Perinatol. 1993 Mar;10(2):178–182. doi: 10.1055/s-2007-994656. [DOI] [PubMed] [Google Scholar]
  13. O'Neill M. E., Cooper K. A., Hunyor S. N., Boyce E. S. "Pseudo" fetal bradycardia during maternal exercise. J Appl Physiol (1985) 1987 Feb;62(2):849–850. doi: 10.1152/jappl.1987.62.2.849. [DOI] [PubMed] [Google Scholar]
  14. Resch B. A., Papp J. G., Gyöngyösi J., Széll S. J. Die Wirkung des Koffeins auf die fetale Herzfrequenz und die Koffeinkonsum-Gewohnheiten der Schwangeren. Zentralbl Gynakol. 1985;107(20):1249–1253. [PubMed] [Google Scholar]
  15. Ridge B. R., Budd G. M. How long is too long in a spa pool? N Engl J Med. 1990 Sep 20;323(12):835–836. doi: 10.1056/NEJM199009203231219. [DOI] [PubMed] [Google Scholar]
  16. Sady S. P., Carpenter M. W. Aerobic exercise during pregnancy. Special considerations. Sports Med. 1989 Jun;7(6):357–375. doi: 10.2165/00007256-198907060-00002. [DOI] [PubMed] [Google Scholar]
  17. Walker D., Walker A., Wood C. Temperature of the human fetus. J Obstet Gynaecol Br Commonw. 1969 Jun;76(6):503–511. doi: 10.1111/j.1471-0528.1969.tb05870.x. [DOI] [PubMed] [Google Scholar]

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