Department of Health Sciences, Swedish Winter Sports Research Centre, Mid Sweden University, 831 25 Östersund, Sweden.
Eur J Appl Physiol. 2011 Jun;111(6):905-13. doi: 10.1007/s00421-010-1712-3. Epub 2010 Nov 11.
The aim here was to employ color tissue velocity imaging (TVI), to test the hypothesis that highly trained endurance athletes exhibit enhanced systolic function of the left ventricular (LV) myocardium both at rest and during combined arm-and-leg exercise in comparison with untrained subjects. For each of the ten elite male (EG) and ten matched control participants (CG), LV dimensions and systolic function were assessed at rest using echocardiography. Subsequently, these subjects exercised continuously on a combined arm-and-leg cycle ergometer for 3 min each at 50, 60, 70, 80, 90 and 100% of VO(2max). Oxygen uptake, heart rate, systolic blood pressure (SBP) and peak contraction systolic velocities of the LV myocardium (PSV) were recorded in the end of each level. At rest, the trained and untrained groups differed with respect to LV dimensions, but not systolic function. At 60-100% VO(2max), the EG group demonstrated both higher PSV and SBP. The observation that the EG athletes had higher PSV than CG during exercise at 60-100% VO(2max), but not at rest or at 50% of VO(2max), suggested an enhanced systolic capacity. This improvement is likely to be due to an enhanced inotropic contractility, which only becomes apparent during exercise.
本研究旨在应用彩色组织速度成像（TVI）技术，检验高训练量耐力运动员在静息状态和四肢联合运动时，左心室（LV）心肌收缩功能增强的假设，与未经训练的个体相比。对 10 名精英男性（EG）和 10 名匹配的对照组（CG）参与者，分别在静息状态下使用超声心动图评估 LV 尺寸和收缩功能。随后，这些受试者连续在四肢联合功率自行车上运动 3 分钟，每个级别分别为 50%、60%、70%、80%、90%和 100%的最大摄氧量（VO(2max)）。在每个水平的末尾记录氧气摄取量、心率、收缩压（SBP）和 LV 心肌的峰值收缩收缩速度（PSV）。在静息状态下，训练组和未训练组在 LV 尺寸上存在差异，但在收缩功能上没有差异。在 60-100% VO(2max)时，EG 组表现出更高的 PSV 和 SBP。EG 运动员在 60-100% VO(2max)运动时的 PSV 高于 CG，而在静息或 50% VO(2max)时没有，这表明收缩能力增强。这种改善可能归因于收缩力的增强，只有在运动时才会变得明显。
