Brion R, Slama M A, Peres G, Gonnot G, Ollivier J P, Droniou J
Service de cardiologie, hôpital d'Instruction des Armées Desgenettes, Lyon.
Arch Mal Coeur Vaiss. 1990 Feb;83(2):229-34.
The use of an original ultrasonic transducer holder has made possible the recording of M mode and 2D echocardiography during exercise. Left ventricular function was studied during upright bicycle exercise in two groups: 10 trained athletes (Group A) and 10 normal subjects (Group B). All were 20 years of age. Satisfactory echocardiograms were obtained up to a mean heart rate of 180/mn which corresponded to an average work load of 180 W in Group B and 300 W in Group A. The cardiac output was comparable in the two groups up to a 180 W load, but in Group A a lower HR was compensated by a larger stroke volume (SV). The increase in SV in Group A was related to a greater LV end-diastolic dimension (LVEDD) during exercise, whereas the ejection fraction increased less than in the control group. During very strenuous exercise (Group A only) further increases in cardiac output were related mainly to an increased heart rate and to a lesser degree to increased LVEDD and ejection fraction.
使用一种原始的超声换能器固定器使得在运动期间记录M型和二维超声心动图成为可能。在两组中研究了直立自行车运动期间的左心室功能：10名训练有素的运动员（A组）和10名正常受试者（B组）。所有受试者均为20岁。在平均心率达到180次/分钟时获得了满意的超声心动图，这在B组中对应于180W的平均工作量，在A组中对应于300W。在180W负荷之前，两组的心输出量相当，但在A组中，较低的心率通过较大的每搏输出量（SV）得到补偿。A组中SV的增加与运动期间更大的左心室舒张末期内径（LVEDD）有关，而射血分数的增加小于对照组。在非常剧烈的运动期间（仅A组），心输出量的进一步增加主要与心率增加有关，在较小程度上与LVEDD和射血分数增加有关。
