2011 Volume 49 Issue 6 Pages 977-982
The interval training (IT) is recommended for patient with cardiovascular disease who cannot accomplish of endurance training (ET) because of leg fatigue. However, there were few reports about a change in the autonomic nerve activation during the IT. The aim of this study was to estimate changes in autonomic nerve activation during the IT and ET. The eight cardiovascular patients performed into the IT and ET. The IT was performed into 10 bouts of exercise with a pause phase of 2 min. The length of the exercise phase in IT was 1 min. ET was performed at a constant intensity for 10 min. The workload was set at the anaerobic threshold. The evaluation indices were systolic blood pressure (SBP), heart rate (HR), and the high frequency (HF) component of power spectra calculated from the R-R interval corresponded to parasympathetic nerve activation. As the results, All indices expect HF in the IT and ET increased concomitantly with the exercise start. Finally, SBP and HR in ET, and HF in IT increased. From these results, sympathetic nerve activation during IT might be a tendency to low in comparison of ET. Furthermore, IT might activate the parasympathetic nerve activation.
