Key result
Submaximal treadmill exercise in pregnancy lowers umbilical artery pulsatility index by ~9% without fetal compromise.
Why the study?
Does an acute submaximal progressive treadmill exercise test alter maternal and fetal hemodynamic and biophysical parameters in low-risk pregnant women?
Cross-Sectional (n=28)
No
Does an acute submaximal progressive treadmill exercise test alter maternal and fetal hemodynamic and biophysical parameters in low-risk pregnant women?
Short submaximal treadmill exercise in low-risk third-trimester pregnant women induces mild umbilical artery vasodilation without compromising fetal well-being or placental blood flow.
Answers are grounded in this paper and cite their sources.
May support short-term exercise safety in low-risk pregnancy; leaves open effects in higher-risk groups or with repeated exposure.
OBJECTIVE: To evaluate the acute effects of maternal and fetal hemodynamic responses in pregnant women submitted to fetal Doppler and an aerobic physical exercise test according to the degree of effort during the activity and the impact on the well-being. METHODS: Transversal study with low risk pregnant women, obtained by convenience sample with gestational age between 26 to 34 weeks. The participants carry out a progressive exercise test. RESULTS: After the exercise session, reduced resistance (p=0.02) and pulsatility indices (p=0.01) were identified in the umbilical artery; however, other Doppler parameters analyzed, in addition to cardiotocography and fetal biophysical profile did not achieve significant change. Maternal parameters obtained linear growth with activity, but it was not possible to establish a standard with the Borg scale, and oxygen saturation remained stable. CONCLUSION: A short submaximal exercise had little effect on placental blood flow after exercise in pregnancies without complications, corroborating that healthy fetus maintains homeostasis even in situations that alter maternal hemodynamics. OBJETIVO: Avaliar os efeitos agudos de respostas hemodinâmicas maternas e fetais em gestantes submetidas a Doppler fetal e a um teste de exercício físico aeróbio, de acordo com o grau de esforço durante a atividade e o impacto sobre o bem-estar. MÉTODOS: Estudo transversal desenvolvido com gestantes de baixo risco, por amostra de conveniência com idade gestacional entre 26 e 34 semanas. As participantes realizam um teste de esforço progressivo. RESULTADOS: Na artéria umbilical, após sessão de exercício físico, identificou-se a redução do índice de resistência (p=0,02) e do índice de pulsatilidade (p=0,01), mas os demais parâmetros Doppler analisados, além da cardiotocografia e do perfil biofísico fetal, não obtiveram alteração significativa. Os parâmetros maternos obtiveram crescimento linear com a atividade, mas não foi possível estabelecer padrão com a escala de Borg, e a saturação de oxigênio se manteve estável. CONCLUSÃO: O esforço submáximo curto teve pouco efeito sobre o fluxo de sangue da placenta após o exercício em gestações sem complicações, corroborando que o feto hígido mantém a homeostase mesmo em situações que alterem a hemodinâmica materna.
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Santos et al. (2016) conducted a cross-sectional in Low-risk pregnancy (n=28). Progressive submaximal aerobic treadmill exercise test vs. Baseline pre-exercise resting state was evaluated on Umbilical artery pulsatility index before vs after exercise (p=0.01). Submaximal treadmill exercise in low-risk pregnant women significantly reduced umbilical artery pulsatility index (1.06 to 0.96, p=0.01) and resistance index (0.65 to 0.62, p=0.02) without altering fetal heart rate or biophysical profile.
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