Heart Rate Variability as an Indicator Associated With the Improvement of Dysmenorrhea After the Warm-water Footbath

"All the participants in the intervention group were arranged to stay in an air-conditioned, quiet room from 5:30 to 6:30 p.m. on their menstruation days 1 and 2. After sitting quietly for 20 minutes, the participants in the footbath group received legs soaking from the heel to the Sanyinjiao (SP6) acupoint (above the ankle) 24 in 42 ℃ water with air bubbles and vibration given to the soles for 20 minutes, whereas the participants in the control group kept on sitting quietly without legs soaking during the additional 20-minute period."