阻力训练不会减少valsalva 动作期间胎盘血流：3D 多普勒功率血流超声的新用途。
Resistance Training Does Not Decrease Placental Blood Flow During Valsalva Maneuver: A Novel Use of 3D Doppler Power Flow Ultrasonography.
机构信息
Department of Orthopedics, Division of Sports Medicine, University of Alabama at Birmingham, Birmingham, Alabama.
Birmingham Veterans Affairs Medical Center, Birmingham, Alabama.
出版信息
Sports Health. 2021 Sep-Oct;13(5):476-481. doi: 10.1177/19417381211000717. Epub 2021 Mar 12.
BACKGROUND
The Valsalva maneuver may increase maternal blood pressure and intra-abdominal pressure, resulting in decreased blood flow to the fetus during resistance training.
HYPOTHESIS
There is no significant reduction in placental blood flow in pregnancy during resistance training in recreational athletes, as documented by a 3-dimensional power flow Doppler ultrasonography.
STUDY DESIGN
Cohort.
LEVEL OF EVIDENCE
Level 3.
METHODS
A cohort of healthy women who participated in recreational athletics was enrolled in a prospective study to assess placental blood flow during a resistance exercise. A 1 repetition maximum (1RM, up to 50 lb) was determined through a modified chest press as a marker of heavy resistance training. Three-dimensional volume measurements and power Doppler flow were determined at the rest phase and during the 1RM lift phase. The vascular flow index (VFI) was calculated to determine placental perfusion during each phase.
RESULTS
A total of 22 women participated. The mean age of participants was 31 years. Gestational age ranged from 13 to 28 weeks. Average 1RM weight lifted was 30 lb. Four women (18%) were able to lift 50 lb, the maximum weight that the study allowed. The remaining 18 women (82%) lifted their true 1RM. Mean VFI during lift phase was 2.185 compared with 2.071 at rest ( = 0.03). There was a slight mean increase in VFI during lift phase, 0.114 (95% CI 0.009-0.182) from 2.071 to 2.185 with lifting ( = 0.03). The 15 women who participated in structured exercise had a mean VFI at rest and during the lift phase of 2.031 and 2.203, respectively ( = 0.01).
CONCLUSION
Three-dimensional power flow Doppler imaging can guide resistance training during pregnancy to prevent fetal injury due to hypoperfusion. Resistance training up to an RM1 of 50 lb did not result in a significant reduction of placental blood flow from resting state in the study population.
CLINICAL RELEVANCE
This technique may be used to guide training parameters among pregnant athletes.
背景
瓦尔萨尔瓦动作可能会增加产妇血压和腹内压，导致阻力训练期间胎儿血流减少。
假设
在娱乐运动员怀孕期间进行阻力训练时，胎盘血流不会因三维功率血流多普勒超声检查而显著减少。
研究设计
队列研究。
证据水平
3 级。
方法
一组参加娱乐运动的健康女性参加了一项前瞻性研究，以评估阻力运动期间胎盘血流。通过改良的俯卧撑确定 1 次重复最大值（1RM，最高 50 磅）作为重阻力训练的标志物。在休息阶段和 1RM 提升阶段进行三维体积测量和功率多普勒血流。计算血管血流指数（VFI）以确定每个阶段的胎盘灌注。
结果
共有 22 名女性参与。参与者的平均年龄为 31 岁。孕龄范围为 13 至 28 周。平均举起的 1RM 重量为 30 磅。有 4 名女性（18%）能够举起 50 磅，这是研究允许的最大重量。其余 18 名女性（82%）举起了她们的真正 1RM。提升阶段的平均 VFI 为 2.185，休息时为 2.071（ = 0.03）。提升阶段 VFI 略有平均增加，从 2.071 增加到 2.185，增加 0.114（95%CI 0.009-0.182）（ = 0.03）。参加结构化运动的 15 名女性在休息和提升阶段的平均 VFI 分别为 2.031 和 2.203（ = 0.01）。
结论
三维功率血流多普勒成像可指导孕妇进行阻力训练，以防止因灌注不足导致胎儿受伤。在研究人群中，阻力训练达到 50 磅的 1RM 不会导致胎盘血流从休息状态显著减少。
临床意义
这项技术可用于指导孕妇运动员的训练参数。
Zotero 插件