负重训练状态对等长运动时血流动力学调节的影响。

Influence of weight training status on hemodynamic adjustments to isometric actions.

作者信息

Patrick B T, Caterisano A

机构信息

Department of Health and Exercise Science, Furman University, Greenville, South Carolina 29613, USA.

出版信息

J Sports Med Phys Fitness. 2002 Dec;42(4):451-7.

PMID:12391440

Abstract

BACKGROUND

The purpose of this study was to investigate the hemodynamic adjustments to fatiguing isometric handgrip (IHG) performed at 20 and 60% of maximal voluntary contraction (MVC) in 10 weight-trained (WT, 4.8+/-1.6 yrs) and 8 untrained (UT) men.

METHODS

Hemodynamic measures were recorded at rest, during sustained IHG to fatigue, and during recovery. Blood pressures and heart rates (HR) were measured by auscultation and electrocardiography, respectively. Stroke volume (SV) was assessed by impedance cardiography. Mean arterial pressure (MAP), cardiac output (CO) and total peripheral resistance (TPR) were calculated.

RESULTS

Between group comparisons in peak hemodynamic adjustments (fatigue value-resting value) to IHG were analyzed across intensities by MANOVA and follow-up univariate tests. The peak adjustments in MAP, HR, and SV during IHG at 20 and 60% MVC were dependent on intensity (60%>20% MVC) but were not significantly different (p>0.05) between groups. However, the intensity-dependent, peak adjustments in CO (WT=1.17+/-1.2 L x min-1 vs UT= -0.40+/-1.7 L x min-1, p=0.005) and TPR (WT=4.4+/-6.1 PRU vs UT=10.2+/-8.3 PRU, p=0.02) were significantly different between groups across intensities of IHG.

CONCLUSIONS

The results suggest that weight training does not significantly influence the pressor response but may significantly modify the adjustments in total-body circulation and vascular resistance during fatiguing IHG performed at 20 and 60% MVC.

摘要

背景

本研究旨在调查10名经过负重训练（WT，4.8±1.6岁）和8名未经训练（UT）的男性在以最大自主收缩（MVC）的20%和60%进行疲劳性等长握力（IHG）时的血流动力学调整情况。

方法

在静息状态、持续进行IHG至疲劳过程中以及恢复过程中记录血流动力学指标。分别通过听诊和心电图测量血压和心率（HR）。通过阻抗心动图评估每搏输出量（SV）。计算平均动脉压（MAP）、心输出量（CO）和总外周阻力（TPR）。

结果

通过多因素方差分析（MANOVA）和后续单变量检验，分析了不同强度下两组间IHG峰值血流动力学调整（疲劳值-静息值）。在20%和60%MVC的IHG过程中，MAP、HR和SV的峰值调整取决于强度（60%MVC>20%MVC），但两组间无显著差异（p>0.05）。然而，在不同强度的IHG过程中，两组间CO（WT=1.17±1.2L·min-1 vs UT=-0.40±1.7L·min-1，p=0.005）和TPR（WT=4.4±6.1PRU vs UT=10.2±8.3PRU，p=0.02）的强度依赖性峰值调整存在显著差异。