Study of Sudden Death at Exertion: Refference to Athlete's Heart.

为探讨运动性心脏性猝死的影响因素，对26名男子长跑运动员在5000米计时赛中发生室性早搏(VPB)的发生率为23%，并对其与室性心律失常及左心功能的关系进行了研究。31%的受试者显示LVCD，23%的受试者显示LVWH。有LVWH者室性早搏的发生率高于无LVWH者，但差异无统计学意义。对70名男子举重运动员进行等长握力运动试验，对70名男性举重运动员进行等长握力运动试验，对70名男性举重运动员进行等长握力运动试验。有20%的受试者发现了LVWH。有LVH的受试者在等长运动时的左心室收缩和舒张功能可能有不同程度的恶化，这是因为无LVH的受试者运动时的心功能增强在LVH受试者中没有表现出来。45名男子举重运动员下蹲时室性早搏的发生率为24%。左心室重量占16%。在这项研究中，受试者的LVWH是轻微的。LVWH的程度与室壁异位活动无明显关系，但建议对LVWH较显著的受试者进行进一步研究。

To investigate a factor affecting exercise-related sudden cardiac death, we study the relation of left vetricular cavity dilatation (LVCD) or left ventrcular wall hypertrophy (LVWH) in athletes to ventricular arrhythmias and left ventricular funtion.The occurrence rate of ventricuar premature beats (VPB's) during a 5000m time-trial run in 26 male long-distance runners was 23%. LVCD was shown in 31% of the subjects, and LVWH was shown in 23% of the subjects. The ocurence rate of VPB's was higher in the subjects with LVWH than that in the subjects without LVWH, though not statistically significantly. Ventricular ectopic activity might be enhanced in the endurance runners with the hypertrophic left ventricular wall thickened unproportionally, although the further studies in a larger figure of subjects should be recommended.Hemodynamic parameters in 70 male power lifters were estimated during isometric hand grip exercise test. LVWH was revealed in 20% of subjects. The left ventricular systolic and diastolic functions during isometric exercise might be deteriorated to some degree in subjects with LVH, because the augmentation of the cardiac functions during exercise, which was revealed in subjects without LVH, were not shown in subjects with LVH.The occurence rate of VPB's during squats in 45 male power lifters was 24%. and that of LVWH was 16%. LVWH in subjects was mild in this study. There was no significant relation between the degree of LVWH and ventricular ectopic activity, although the further study in the subjects with more significant LVWH should recommended.