2.4.3. Autonomic Nervous System Activity
At Weeks 0 and 8, the participants’ autonomic nervous system activity was measured with an acceleration plethysmogram (Artett C, U-Medica, Osaka, Japan). The participants maintained a sitting position with an arm at heart-level; they inserted the index or middle finger into the sensor body and the autonomic nervous system activity was then measured for 5 min. The low-frequency (LF) component, the high-frequency (HF) component, the ratio of these components (LF/HF), and the very-low-frequency (VLF) component were then determined by Artett CDN autonomic nervous system evaluation software (Ver.1.0.0.35, U-Medica, Osaka, Japan).