Key result
Moderate-intensity aerobic exercise did not impact peripheral vascular health measures across pregnancy, despite overall increases in carotid artery diameter (6.5 to 6.9 mm, P<0.001) in all women.
Why the study?
Exercise improves peripheral vascular health, but its impact on prenatal vascular adaptations across pregnancy is unclear.
Does moderate-intensity aerobic exercise improve peripheral vascular health in inactive pregnant women?
RCT (n=59)
randomized
Does moderate-intensity aerobic exercise improve peripheral vascular health in inactive pregnant women?
A structured aerobic exercise intervention during the second and third trimesters of pregnancy did not significantly alter peripheral vascular adaptations in low-risk inactive women.
Answers are grounded in this paper and cite their sources.
Exercise does not alter peripheral vascular measures in pregnancy; leaves open carotid adaptations and requires larger prospective trials.
Purpose Healthy pregnancy is typically associated with favorable vascular adaptations to both structure and function of the peripheral arteries. Exercise is independently associated with improvements in peripheral vascular health; however, the impact of exercise on prenatal adaptations is unclear. Therefore, we hypothesized that a structured aerobic exercise intervention between the second and third trimesters (TM2 and TM3, respectively) of pregnancy would augment the already-positive changes in vascular outcomes. Methods We recruited 59 inactive pregnant women (<20 wk of gestation) and randomized them into control (standard care; n = 28) or exercise (moderate-intensity aerobic exercise, 3–4 d·wk −1 , 25–40 min, 14 ± 1 wk; n = 31) conditions. Before and after the intervention, all women completed the comprehensive peripheral vascular assessment, which included blood markers of vascular health, carotid distensibility metrics, measures of arterial stiffness (pulse wave velocity), and [superficial] femoral artery reactivity during cold pressor test. Results Carotid artery diameter increased from 6.5 to 6.9 mm ( P < 0.001), and strain (%) decreased from 9.9% to 8.4% ( P < 0.001). Carotid artery blood flow, compliance and distensibility coefficients, stiffness ( β ), distensibility (1/ β ), and elastic modulus were not different across gestation. Pulse wave velocity was not different across gestation. Superficial femoral artery diameter was increased from 5.4 to 5.6 mm ( P = 0.004), whereas blood flow, conductance, and resistance at rest and during the cold pressor test were not different across gestation. None of our measures of vascular health were impacted by exercise. Conclusions We did not observe an impact of aerobic exercise on altering the changes across pregnancy in blood vessel health. However, the present study was conducted in women who were overall at low risk for developing gestational hypertension and should be interpreted with caution. Future work in high-risk women is needed.
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Skow et al. (2021) conducted an RCT in pregnancy (n=59). Moderate-intensity aerobic exercise vs. Standard care was evaluated on Peripheral vascular health (blood markers, carotid distensibility, pulse wave velocity, and femoral artery reactivity). Moderate-intensity aerobic exercise did not impact peripheral vascular health measures across pregnancy, despite overall increases in carotid artery diameter (6.5 to 6.9 mm, P<0.001) in all women.
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