“…Additionally, exposure to MHO has recently attracted public attention globally, because it may be an effective method for recovery after training or conditioning for sports 22) , or for anti-aging of skin 23) , however, the detailed changes in the cardiovascular system after exposure to MHO are unclear. Exposure to HBO or MHO induces an increased peripheral oxygen saturation (SpO 2 ) level and a decreased heart rate (HR) 14,24,25) , although a consistent view of the effects of HBO or MHO on BP has not yet been obtained. In a previous study, within almost an hour after hyperbaric exposure at 4 atm for 30 minutes (min), the mean BP and diastolic BP (DBP) increased 25) .…”