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Cardiac Responses to Submaximal Isometric Contraction and Aerobic Exercise in Healthy Pregnancy.

Abstract：

PURPOSE:The increased physiological demand of pregnancy results in profound adaptation of the maternal cardiovascular system, reflected by greater resting cardiac output and left ventricular (LV) deformation. Whether the increased resting demand alters acute cardiac responses to exercise in healthy pregnant women is not well understood. METHODS:Healthy non-pregnant (n=18), pregnant (n=14, 22-26 weeks gestation) and postpartum women (n=13, 12-16 weeks post-delivery) underwent assessments of cardiac function and LV mechanics at rest, during a sustained isometric forearm contraction (30% maximum) and during low- (LOW) and moderate-intensity (MOD) dynamic cycling exercise (25 and 50% peak power output). Significant differences (α=0.05) were determined using ANCOVA and general linear model (resting value included as covariate). RESULTS:When accounting for higher resting cardiac output in pregnant women, pregnant women had greater cardiac output during isometric contraction (2.0±0.3; non-pregnant: 1.3±0.2; postpartum: 1.5±0.5 L.min/m, P=0.02), but similar values during dynamic cycling exercise (pregnant: LOW: 2.8±0.4, MOD: 3.4±0.7, non-pregnant: LOW: 2.4±0.3, MOD: 3.0±0.3, postpartum: LOW: 2.3±0.4, MOD: 3.0±0.5 L.min/m, P=0.96). Basal circumferential strain was higher in pregnant women at rest, during the sustained isometric forearm contraction (-23.5±1.2%, non-pregnant: -14.6±1.4%, P=0.001) and during dynamic cycling exercise (LOW: -27.0±4.9, MOD: -27.4±4.6%; non-pregnant: LOW: -15.8±4.5, MOD: -15.2±6.7%, P=0.012), however other LV mechanics parameters were not different between groups. CONCLUSION:The results support that the maternal heart can appropriately respond to additional cardiac demand and altered loading experienced during acute isometric and dynamic exercise, although subtle differences in responses to these challenges were observed. Additionally, the LV mechanics that underpin global cardiac function are greater in pregnant women during exercise, leading to the speculation that the hormonal milieu of pregnancy influences regional deformation.

journal_name

Med Sci Sports Exerc

journal_title

Medicine and science in sports and exercise

authors

Meah VL,Backx K,Cockcroft JR,Shave RE,StÖhr EJ

doi

10.1249/MSS.0000000000002554

subject

Has Abstract

pub_date

2020-11-03 00:00:00

eissn

0195-9131

issn

1530-0315

pub_type

杂志文章

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Cardiac Responses to Submaximal Isometric Contraction and Aerobic Exercise in Healthy Pregnancy.