to assess the dynamics of autonomic nervous activity during and immediately after exercise , we determined the power spectrum of heart rate and respiratory fluctuations in 43 normal subjects without known cardiac disease , 8 patients with severe congestive heart failure , and 6 patients status-post cardiac transplantation before , during , and after graded-work load exercise on a cycle ergometer .
C0018799
cardiac
C0018802
congestive heart failure