...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Medicine and science in sports and exercise >Myocardial Adaptations to Competitive Swim Training
【24h】

Myocardial Adaptations to Competitive Swim Training

机译：心肌改编竞争游泳训练

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Purpose Swim training is performed in the prone or supine position and obligates water immersion, factors that may augment cardiac volume loading more than other endurance sports. At present, prospective data defining the cardiac responses to swim training are lacking. We therefore studied myocardial adaptations among competitive swimmers to establish a causal relationship between swim training and left ventricular (LV) remodeling. Methods Collegiate swimmers were studied before and after a 90-d period of training intensification. Transthoracic echocardiography was used to examine LV structural and functional adaptations under resting conditions and during an acute LV afterload challenge generated by isometric handgrip testing (IHGT). A sedentary control population was identically studied with IHGT. Results In response to a discrete period of swim training intensification, athletes (n = 17, 47% female, 19 +/- 0.4 yr old) experienced eccentric LV remodeling, characterized by proportionally more chamber dilation than wall thickening, with attendant enhancements of resting LV systolic (LV twist) and diastolic (early and late phase tissue velocities) function. Compared with baseline and controls, athletes posttraining demonstrated greater systolic twist impairment during IHGT. However, training-induced LV dilation coupled with gains in diastolic function offsets this acquired systolic susceptibility to acute afterload, resulting in the relative preservation of stroke volume during IHGT. Conclusion Swim training, a sport characterized by unique cardiac loading conditions, stimulates eccentric LV remodeling with the concomitant augmentation of systolic twist and diastolic relaxation. This volume-mediated cardiac remodeling appears to result in greater systolic susceptibility to acute afterload challenge. Further work is required to establish how training-induced changes in function translate to human performance and whether these are accompanied by physiologic trade-offs with relevance to common forms of heart disease.
机译：目的游泳训练是在俯卧或仰卧位置进行的，并义浸水，可能增加心脏容量的因素超过其他耐力运动。目前，缺乏定义对游泳训练的心脏反应的前瞻性数据。因此，我们研究了竞争性游泳者之间的心肌改编，以建立游泳训练与左心室（LV）重塑之间的因果关系。方法在90-D训练强化之前和之后研究了大学游泳运动员。在休息条件下和在等距手柄测试（IHGT）产生的急性LV后载攻击期间，使用经脉冲超声心动图检查LV结构和功能适应。用IHGT相同地研究了久坐的对照种群。结果响应了扫描训练强化的离散时期，运动员（n = 17,47％的女性，19 +/- 0.4 yr旧）经历了偏心LV重塑，其特征在于比壁增厚成比例更多的腔室扩张，具有伴随的休息增强功能LV收缩压（LV捻度）和舒张（早期和后期组织速度）功能。与基线和对照相比，运动员在IHGT期间显示出更大的收缩压损伤。然而，训练诱导的LV扩张与舒张函数的增益偏移偏移这一获得的收缩敏感性对急性的急性损伤，导致在IHGT期间的中风体积的相对保存。结论游泳训练，一种以独特的心脏载荷条件为特征的运动，刺激偏心LV重塑，伴随收缩期扭曲和舒张松弛。该体积介导的心脏重塑似乎导致急性后载攻击更大的收缩敏感性。需要进一步的工作来确定培训诱导的功能变化如何转化为人类绩效以及这些是否伴随着与常见形式的心脏病形式相关的生理权衡。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号