Effect of exercise stress on carotid, uterine, and iliac blood flow in pregnant and nonpregnant ewes

Orr, Joseph A.; Ungerer, Tonny; Will, James A.; Wernicke, K.; Curet, Luis B.

doi:10.1016/0002-9378(72)90061-0

Cited by 34 publications

(9 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Rauramo et al 12 exercised pregnant women in the late third trimester and noted a simultaneous increase in serum estriol levels, which was attributed to increased blood flow to the uteroplacental bed; however, no actual or direct measurement of uterine blood flow was attempted. Orr et al 13 examined the relationship between treadmill exercise and uterine blood flow in catheterized, pregnant ewes and reported no changes. Clapp 14 reported similar findings, except that he did note uterine blood flow to decrease (by 28%) when the animals were exercised to exhaustion.…”

Section: Commentmentioning

confidence: 99%

Exercise-Induced Changes in Uterine Artery Blood Flow, as Measured by Doppler Ultrasound, in Pregnant Subjects

Moore¹,

Jarrett²,

Bendick³

1988

Amer J Perinatol

View full text Add to dashboard Cite

Eleven healthy women with singleton pregnancies between 16 and 28 weeks gestation were continuously exercised, in a graded fashion, by stationary bicycle to a predetermined target heart rate. Before and within 3 minutes after exercise, uterine artery waveforms were identified from a semirecumbent position using a 3.5 MHz continuous-wave Doppler transducer coupled to an Angioscan spectrum analyzer. The ratio of peak systolic to end-diastolic frequency (A/B ratio) was utilized to assess qualitative differences in flow before and after exercise. No statistically significant changes in A/B ratios were noted. This study suggests that nonexhaustive maternal exercise does not compromise uterine artery blood flow in healthy, low-risk pregnant subjects.

show abstract

Section: Commentmentioning

confidence: 99%

Exercise-Induced Changes in Uterine Artery Blood Flow, as Measured by Doppler Ultrasound, in Pregnant Subjects

Moore¹,

Jarrett²,

Bendick³

1988

Amer J Perinatol

View full text Add to dashboard Cite

show abstract

“…The dramatic effects of exercise on preg nancy in the rat, guinea pig [18] and mouse [12] contrast with the negligible effects that exercise induced on UBF or pregnancy in ewes [19,20]. These species differences may be attributed to differences in both placental structure and vascular supply patterns, exer cise regimes, or other factors unique to either model or testing system.…”

Section: Discussionmentioning

confidence: 90%

Effects of Exercise on Fetal-Placental Growth and Uteroplacental Blood Flow in the Rat

Garris¹,

Kasperek

Overton

et al. 1985

Neonatology

View full text Add to dashboard Cite

The effects of daily maternal exercise on fetal-placental growth and development and the associated changes in uteroplacental blood flow were studied in pregnant rats. Pregnant females were exercised for 1 h (0% grade at 28 m/min) daily between either days 1 and 12, 1 and 18, 1 and 22, 12 and 18, or 12 and 22 of gestation and compared with nonexercised controls. Exercise between days 1 and 12 of pregnancy had no effect on fetal-placental parameters (i.e., fetal weight or gestation length) relative to controls. In contrast, exercise between days 1 and 22 and 12 and 22 resulted in a lower number of live pups born, an increase in gestational length, and an increased birth weight of the live pups relative to controls. Exercise between days 1 and 18 or 12 and 18 induced a significant (p ≤ 0.05) suppression of uteroplacental blood flow, the number of viable fetuses, and placental weights as compared with controls. Daily exercise had no effect on ovarian function as indicated by the comparable serum progesterone levels in all groups. These data indicate that an exercised-induced depression of uteroplacental blood flow is related to impaired fetal-placental growth and development during pregnancy in the rat.

show abstract

“…Animal studies suggest that blood is similarly diverted away from the uteroplacental vascular bed. Nonexhaustive treadmill exercise in pregnant ewes caused a variable response in uterine arterial blood flow, from no change up to a reduction of 59 percent (105,(115)(116)(117)(118)(119). In contrast to humans, however, sheep dissipate heat by panting, which results in respiratory alkalosis that may be partly responsible for the decrease in uterine arterial blood flow (87).…”

Section: Effects On Uteroplacental Flowmentioning

confidence: 99%

Exercise and Pregnancy: A Review

Bell

O'Neill

Rehab

1994

Birth

View full text Add to dashboard Cite

The effects of pregnancy on the maternal cardiorespiratory system include increases in oxygen consumption, cardiac output, heart rate, stroke volume, and plasma volume. The increase in oxygen reserve seen in early pregnancy is reduced later, suggesting that maternal exercise may present a greater physiologic stress in the third trimester. Evidence suggests that weight-bearing exercise produces a greater decrease in oxygen reserve than nonweight-bearing exercise. Furthermore, to maintain a heart rate below 140 beats per minute during pregnancy, the intensity of weight-bearing exercise must be reduced. Nonweight-bearing, water-based exercise results in smaller fetal heart rate changes and a lower maternal heart rate than the same exercise performed on land. Exercising in the supine position in late pregnancy has raised concerns because cardiac output in the supine position is lower than in the lateral position at rest, presumably because the gravid uterus partially obstructs the inferior vena cava. Sustained exercise produces a training effect on the mother, although reported associations between this effect and the experience of labor are not consistent. Short-term changes in fetal heart rate provide circumstantial evidence that physical activity can influence the fetus. Acute effects of exercise that can potentially affect the fetus include hyperthermia, changes in uteroplacental flow, reduced levels of maternal glucose, and increased uterine contractions. Moderate to high levels of sustained maternal exercise have been associated with reduced birthweight. Much research remains to be done on the effects of specific exercise regimens during pregnancy, the effects on previously sedentary women, and the long-term health consequences to the offspring of women who perform vigorous exercise during pregnancy.

show abstract

Effect of exercise stress on carotid, uterine, and iliac blood flow in pregnant and nonpregnant ewes

Cited by 34 publications

References 11 publications

Exercise-Induced Changes in Uterine Artery Blood Flow, as Measured by Doppler Ultrasound, in Pregnant Subjects

Exercise-Induced Changes in Uterine Artery Blood Flow, as Measured by Doppler Ultrasound, in Pregnant Subjects

Effects of Exercise on Fetal-Placental Growth and Uteroplacental Blood Flow in the Rat

Exercise and Pregnancy: A Review

Contact Info

Product

Resources

About