Left ventricular systolic performance during prolonged strenuous exercise in female triathletes.
Left ventricular systolic performance during prolonged strenuous exercise in female triathletes.
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DOI：
10.1186/1476-5918-2-2
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发表时间：
2003-04-08
期刊：
影响因子：
--
通讯作者：
Welsh R
中科院分区：
文献类型：
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作者：
McGavock J;Haykowsky M;Warburton D;Taylor D;Quinney A;Welsh R
长期剧烈运动（PSE）对年轻女性铁人三项运动员左心室（LV）收缩功能的影响尚未得到很好的研究。本研究检查了PSE之前、期间和之后即刻的LV收缩功能（即，40公里自行车计时赛后10公里跑）。在PSE之前、期间和之后立即获得二维超声心动图图像。在每个时间点测量心率、收缩压、舒张末期和收缩末期腔面积。还结合超声心动图和血液动力学测量以获得LV收缩末期壁应力和心肌收缩力（即，收缩压-收缩末期腔面积关系）。受试者以相当于最大心率90 ± 3%的强度进行运动。运动时心率、收缩压、收缩压-收缩末期腔面积关系和面积变化分数增加，舒张末期和收缩末期腔面积减少。年轻女性铁人三项运动员中，PSE与继发于心肌收缩力增加的LV收缩功能增强相关。
The effect of prolonged strenuous exercise (PSE) on left ventricular (LV) systolic function has not been well studied in younger female triathletes. This study examined LV systolic function prior to, during and immediately following PSE (i.e., 40 km bicycle time trial followed by a 10 km run) in 13 younger (29 ± 6 years) female triathletes. Two-dimensional echocardiographic images were obtained prior to, at 30-minute intervals during and immediately following PSE. Heart rate, systolic blood pressure, end-diastolic and end-systolic cavity areas were measured at each time point. Echocardiographic and hemodynamic measures were also combined to obtain LV end-systolic wall stress and myocardial contractility (i.e., systolic blood pressure – end-systolic cavity area relation). Subjects exercised at an intensity equivalent to 90 ± 3% of maximal heart rate. Heart rate, systolic blood pressure, systolic blood pressure – end-systolic cavity area relation and fractional area change increased while end-diastolic and end-systolic cavity areas decreased during exertion. PSE is associated with enhanced LV systolic function secondary to an increase in myocardial contractility in younger female triathletes.