CARDIAC SIZE AND FUNCTION IN SCHOOL ATHLETES AT REST AND AFTER EXERCISE

To determine the effect of high school athletics on cardiac structure and function, we performed 2-D directed M-Mode echos on students involved in isometric (IM) and isotonic (IT) sports and compared them to non-athletic controls (C). Measurements were made at rest and immediately after stage 4 treadmill exercise. Twenty students were included in each group. LV mass was greater in both in and IT compared to C (C 111±4, IM 132±3, IT 130±4 g/M2, p . In IT LV diastole volume (LVDV) was increased with normal wall thickness/radius ration (t/r), whereas, in IM, LVDV was normal but, t/r was increased. Stroke index (SI) was increased in IT (C 44±1.7, IM 46±1.6, IT 52.3±2.0 ml/M2, p