Marshall Erica M, Parks Jason C, Tai Yu Lun, Kingsley J Derek
Cardiovascular Dynamics Laboratory, School of Health Sciences, Kent State University, Kent, OH, USA.
Department of Health & Human Performance, University of Texas-Rio Grande Valley, Brownsville, TX, USA.
Int J Exerc Sci. 2020 May 1;13(2):526-538. doi: 10.70252/JUUH3609. eCollection 2020.
The purpose of this study was to examine hemodynamic and vascular responses between machine-weight and free-weight exercise. Resistance-trained individuals were assigned to a machine-weight ( = 13) or free-weight ( = 15) group. Groups completed two visits consisting of their assigned exercise condition and a control (CON). A 2 × 2 × 3 repeated measures ANOVA was used to test the effects of group across condition and time on the hemodynamic parameters [cardiac output (CO), heart rate (HR), total peripheral resistance (TPR), mean arterial pressure (MAP), and stroke volume (SV)]. A 2 × 2 × 2 repeated measures ANOVA was used to test the effects of group across condition and time on the hemodynamic variable, forearm vascular conductance (FVC), as well as on vascular measures [forearm blood flow (FBF), blood flow peak, and total reactive hyperemia (RH)]. Main effects were analyzed using pairwise comparisons. The results of the present study demonstrate that both machine-weight and free-weight exercise produce similar ( > 0.05) alterations in hemodynamics and vascular function. Specifically, during recovery both groups demonstrated significant ( ≤ 0.05) increases in measures of hemodynamics such as CO, HR and FVC, as well as significant ( ≤ 0.05) decreases in TPR, MAP, and SV. Measures of vascular function such as FBF, blood flow peak, and total RH were also significantly ( ≤ 0.05) increased during recovery. Therefore, this study suggests that either machine weight or free-weight exercise may induce acute hemodynamic and vascular benefits, which may reduce the risk of cardiovascular disease (CVD) and CVD events.
本研究的目的是检验器械重量训练和自由重量训练之间的血流动力学和血管反应。将经过抗阻训练的个体分为器械重量训练组（n = 13）或自由重量训练组（n = 15）。两组均完成两次访视，包括各自指定的运动条件和一次对照（CON）。采用2×2×3重复测量方差分析来检验分组在不同条件和时间下对血流动力学参数[心输出量（CO）、心率（HR）、总外周阻力（TPR）、平均动脉压（MAP）和每搏输出量（SV）]的影响。采用2×2×2重复测量方差分析来检验分组在不同条件和时间下对血流动力学变量前臂血管传导率（FVC）以及血管测量指标[前臂血流量（FBF）、血流峰值和总反应性充血（RH）]的影响。主要效应采用两两比较进行分析。本研究结果表明，器械重量训练和自由重量训练在血流动力学和血管功能方面产生相似（P>0.05）的变化。具体而言，在恢复过程中，两组的血流动力学指标如CO、HR和FVC均显著（P≤0.05）增加，而TPR、MAP和SV则显著（P≤0.05）降低。血管功能指标如FBF、血流峰值和总RH在恢复过程中也显著（P≤0.05）增加。因此，本研究表明，器械重量训练或自由重量训练均可诱导急性血流动力学和血管益处，这可能降低心血管疾病（CVD）及CVD事件的风险。
