Relevance between Habits and Customs, and HRV

Influence of Manual Breathing Assist Technique on Autonomic Nervous Response【川崎医療福祉学会誌 Vol. 24 No. 2 2015 173-179】


   The purpose of this study was to demonstrate the safety of the manual breathing assist technique. We examined 18 healthy students (9 males and 9 females) for the influence of the manual breathing assist technique on the autonomic nervous response. We performed manual breathing assist for 5 min. We measured blood pressure, respiratory rate and heart rate and calculated the heart rate variability and salivary amylase activity as autonomic nervous response activities. In frequency analyses of heart rate variability, we obtained very low-frequency (VLF), low-frequency (LF) and high-frequency (HF) components and we used LF/HF and HF as the indicators of sympathetic nerve activity and parasympathetic nerve activity, respectively. We calculated the integral value of each power using the autoregressive method and analyzed the RR intervals by Lorenz plot to make a comparison between the values during rest and manual chest compressions.

 Our results showed that the respiration rate and systolic blood pressure were significantly decreased by performing manual chest compressions. No significant difference in the salivary amylase activity, LF/HF and HF nu was observed. Significant increase in logLT which is an indicator of parasympathetic nerve activity was observed by Lorenz plot, but there was no difference between male and female. Based on these results, we considered that manual chest compressions enhanced the parasympathetic nerve activity but not the sympathetic nerve activity significantly. In addition, it is suggested that Lorenz plot is a more sensitive method than the spectrum analysis of the power of heart rate and measurement of the salivary amylase activity.