THE EFFECT OF EXERCISE TRAINING ON HEART RATE VARIABILITY AND STROKE VOLUME: THE HERITAGE FAMILY STUDY

1234 The effect of exercise training on heart rate variability (HRV) and stroke volume (SV) was investigated in 18 male and 20 female subjects (mean age=41.5±13.8) who participated in a 20 week, 60 session, cycling program and who significantly increased VO2max 16.2 and 22.9% respectively. HRV was measured as the standard deviation of all normal to normal beats in a 2 min resting recording. SV of the 38 subjects at 50 watts increased significantly (4.9±9.6 ml·beat-1, p<0.003). However, resting HRV approached, but did not reach, significance(3.0±11.0 msec, p<0.08). The variables below are absolute changes with training: TableTable