RESUMO
This study was designed to investigate the association between autonomic nervous activities and clinical symptoms of climacteric women with qi disturbance. Power spectral analysis of heart-rate variability (HRV) was performed in 55 climacteric patients with undefined symptoms (age;51.9±2.8). The total power of HRV in patients with hot flushes was significantly higher (529.6±529.9ms2) than that of patients without this symptom (295.4±260.8 ms2) (P<0.05). The sympathetic nerve system (SNS) index in patients with hot flushes and with jitters (2.81±2.93 and 3.16±2.78), was significantly higher than those of patients without them (1.03±0.78 and 0.87±0.72) (P<0.001 and P<0.0001, respectively). The parasympathetic nerve system (PNS) index of patients with hot flushes and patients with jitters (0.38±0.19 and 0.33±0.16) was significantly lower than those of patients without them (0.55±0.17 and 0.58±0.14) (P<0.001 and P<0.0001, respectively). These findings indicate that HRV-based assessment of the autonomic nervous system activity of climacteric women with hot flushes and jitters, which have been known as symptoms of qi counterflow in the Kampo medicine, is associated with an increase in sympathetic nerve system and a decrease in parasympathetic nerve system activity. It has been suggested that autonomic nervous activities be included in the part of pathological condition of qi in the Kampo medicine, and that evaluation of qi be used as one diagnostic tool in the practical Kampo medicine, or fusion of western and oriental medicine.
RESUMO
The aim of this study was to investigate the relationship between heart rate variability (HRV) during exercise and ventilatory threshold (VT), using the MemCalc system which is superior in spectral analysis. Nine healthy male subjects with no cardiopulmonary disease performed an exercise test to exhaustion to determine VT on a bicycle ergometer. Low frequency (LF : 0.04-0.15 Hz), high frequency (HF : 0.15-0.40Hz) and LF/HF ratio power spectra were calculated by maximum entropy method (MEM) spectral analysis, using the MemCalc system. In each case, when the subject started exercise, the HF component declined rapidly during the first 30 seconds ; and compared to the resting value, it declined to approximately 5 % at VT. The possibility of using this phenomenon as a criterion for setting intensity of exercise is tinder consideration. The LF/HF ratio showed different patterns of variation among the subjects. A significant linear relationship was seen between the declining rate of the HF component and VT (r=0.93, p<0.001), suggesting a corres pondence between the heart's capability of adjusting to maintained exercise and high endurance capacity.