Sundstedt Milena, Hedberg Pär, Henriksen Egil
Department of Clinical Physiology and Centre of Clinical Research, Uppsala University, Central Hospital, Västerås, Sweden.
Clin Physiol Funct Imaging. 2008 Jan;28(1):27-31. doi: 10.1111/j.1475-097X.2007.00769.x.
The aim of the present study was to quantify the left ventricular (LV) longitudinal motion during exercise at rest and during upright exercise in 24 healthy male endurance athletes. By using M-mode and two-dimensional echocardiography, the relative mitral annular motion and the absolute LV longitudinal axis was measured at end-diastole and end-systole at rest and during exercise. From rest to peak exercise at a heart rate of 160 beats per minute (bpm) the mitral annular motion increased in the septal and lateral annular borders by 68% and 49% respectively. At rest, mitral annular excursion was significantly (13%) higher in the lateral than in the septal wall but at peak exercise at a heart rate of 160 bpm there was no difference between the septal and lateral annular motion. The total end-diastolic LV axial length did not increase from rest to peak exercise. In conclusion, during upright exercise, mitral annular motion increased significantly with no difference between the septal and lateral annular excursion at peak exercise. The absolute increase in mitral annular motion during exercise was explained by a decrease in axial end-systolic length.
本研究的目的是量化24名健康男性耐力运动员在静息状态和直立运动期间左心室（LV）的纵向运动。通过使用M型和二维超声心动图，在静息状态和运动期间的舒张末期和收缩末期测量相对二尖瓣环运动和绝对左心室纵轴。从静息状态到心率为每分钟160次（bpm）的运动峰值，二尖瓣环运动在间隔和外侧环边界分别增加了68%和49%。在静息状态下，二尖瓣环偏移在外侧壁比间隔壁显著高13%，但在心率为160 bpm的运动峰值时，间隔和外侧环运动之间没有差异。从静息状态到运动峰值，舒张末期左心室总轴长没有增加。总之，在直立运动期间，二尖瓣环运动显著增加，在运动峰值时间隔和外侧环偏移之间没有差异。运动期间二尖瓣环运动的绝对增加是由于收缩末期轴长的减少。
