Applications of methods and techniques in the study of aerobic fitness during pregnancy

Wiswell, R. A.

doi:10.1016/s0146-0005(96)80014-0

Cited by 3 publications

(7 citation statements)

References 45 publications

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“…In pregnant women undergoing maximal treadmill exercise, V O 2 max (expressed as l/min), maximal HR, and maximal power output are unaffected (24). Whether efficiency is altered in submaximal weight-bearing exercise in pregnant women is not settled, with increases, decreases, and no change in efficiency observed (39). Weight gain, which is a factor that could decrease exercise efficiency with pregnancy, averaged ϳ11% in the rabbits.…”

Section: Limitationsmentioning

confidence: 99%

Uterine artery blood flow and renal sympathetic nerve activity during exercise in rabbit pregnancy

OʼHagan

Alberts

2003

American Journal of Physiology-Regulatory, Integrative and Comp

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The uterine artery blood flow (UtBF) and renal sympathetic nerve activity (SNA) responses to treadmill exercise were evaluated in 12 nonpregnant (NP) and 17 term pregnant (P) rabbits. UtBF was monitored continuously with a Transonic flowprobe. Rabbits underwent three exercise trials (5-min duration) that varied in absolute workload. The rise in renal SNA with exercise was intensity related. Pregnancy did not affect the average steady-state renal SNA response expressed relative to maximum activity (P 24 +/- 1% vs. NP 23 +/- 2% of maximum smoke-elicited activity) and increased the average renal SNA response expressed relative to resting activity (P +155 +/- 19% vs. NP +84 +/- 23% from rest, P = 0.03) At rest, UtBF (P 13 +/- 3 vs. NP 1.9 +/- 0.3 ml/min) and uterine artery conductance (UtC; P 22 +/- 5 vs. NP 2.8 +/- 0.5 ml. min-1.mmHg-1 x 10-2) were elevated in the P rabbits. The average exercise-related decreases in UtBF (P -16 +/- 4% vs. NP -48 +/- 4%) and UtC (P -27 +/- 4% vs. NP -54 +/- 4%) were attenuated in the P rabbits. Pregnancy does not impair the ability to raise renal SNA but attenuates the uterine artery constrictor response to moderate to heavy dynamic exercise in rabbits. Under normal conditions, the pregnant uterine circulatory bed may be relatively protected from exercise-related redistribution of blood flow.

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Section: Limitationsmentioning

confidence: 99%

Uterine artery blood flow and renal sympathetic nerve activity during exercise in rabbit pregnancy

OʼHagan

Alberts

2003

American Journal of Physiology-Regulatory, Integrative and Comp

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“…In contrast, research findings published since the 1970's do not support these concerns (Clapp, 2000;Dempsey et al, 2005). In fact, findings of studies completed since 1985 have demonstrated no adverse maternal or foetal effects in healthy women engaged in mild and moderate exercise activities Henriksson-Larsen, 1999;Riemann & Kanstrup-Hansen, 2000;Dempsey et al, 2005;), but rather, showed somewhat favourable effects (Wiswell, 1996;Sternfeld, 1997;Clapp, 2000;Frey, 2002 (Dempsey et al, 2005;Morris & Johnson, 2005), but as a normal physiological condition.…”

Section: Exercise Recommendations Duringmentioning

confidence: 98%

“…The cardiovascular changes associated with pregnancy include: an increased resting heart rate (Wiswell, 1996;Sternfeld, 1997;Shephard, 2000;Wolfe & Weissgerber, 2003;Morris & Johnson, 2005), a decreased maximum heart rate (Wiswell, 1996;Hale & Milne, 1996;Sternfeld, 1997;Wolfe & Weissgerber, 2003), an increased cardiac output, an increased stroke volume, an increased left ventricular mass (Pivarnik, 1996;Shephard, 2000) and an increased blood and plasma volume (Shephard, 2000;Morris & Johnson, 2005). Most of these changes are seen as early as in the fifth…”

Section: Cardiovascular Functionmentioning

confidence: 99%

“…week of gestation and by 12 weeks, the rise in cardiac output is about 35% above pre-pregnancy levels (Morris & Johnson, 2005). For the exercising pregnant woman who uses her heart rate as a training guide, the pregnancy-induced increased resting heart rate and decreased maximum heart rate could compromise heart-rate based predictions of aerobic fitness and training intensity (Hale & Milne, 1996;Wiswell, 1996;Sternfeld, 1997;Shephard, 2000;Wolfe & Weissgerber, 2003;Borg-Stein et al, 2005). The use of revised pulse rate target zones (Wolfe & Weissgerber, 2003) (Sternfeld, 1997;Wolfe & Weissgerber, 2003).…”

Section: Cardiovascular Functionmentioning

confidence: 99%

“…The concerns about exercising during pregnancy relate to the dual stresses of pregnancy and exercise that might create conflicting physiological demands on the mother-to-be (Wiswell, 1996;Sternfeld, 1997). In contrast to the adaptations that occur during pregnancy, which are intended to nurture and protect the foetus, those that occur during exercise serve to maintain maternal homeostasis.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of exercise on preconception, pregnant women, the development foetus and delivery: a review

Crafford¹,

Viljoen

2009

Af. J. Phys, Health Edu. Rec. & Dance

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There are many questions about the relationship between pregnancy and exercise. This article presents an overview of published works on a) exercise and problems with conception, with the focus on amenorrhea and miscarriage, b) exercise and pregnancy, highlighting the influence of exercise on maternal metabolism, cardiovascular and respiratory function, c) exercise and the developing embryo/foetus, with the focus on placental formation/growth, substrate availability and foetal hyperthermia, d) exercise and the labour/delivery process, with the emphasis on preterm labour, as well as e) exercise and the postpartum period, with the focus on neonatal outcome, maternal recovery after parturition and lactation. It concludes with recent recommendations and precautions associated with exercise during pregnancy, as well as shortcomings in available information. In general, literature does not seem to support the concerns about prenatal exercise, but rather shows that both mother and foetus benefit when the mother is involved in moderate exercises during pregnancy. Indications are that the benefits will only be experienced in full by women who, within reasonable limits, continue to exercise throughout their pregnancy.

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Exercise in pregnancy

Ezmerli

2000

Primary Care Update for OB/GYNS

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Applications of methods and techniques in the study of aerobic fitness during pregnancy

Cited by 3 publications

References 45 publications

Uterine artery blood flow and renal sympathetic nerve activity during exercise in rabbit pregnancy

Uterine artery blood flow and renal sympathetic nerve activity during exercise in rabbit pregnancy

Influence of exercise on preconception, pregnant women, the development foetus and delivery: a review

Exercise in pregnancy

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