Could Apnea Induce Hypoalgesia?

In both experimental and control groups participants walked on a treadmill at 5.5 km/h with 5º inclination for 6 minutes. The experimental group (EG) added throughout the 6 minutes intervention the following breathing pattern cyclically: 5 seconds breathing normally followed by 10 seconds of low volume apnoea, performing a total of 24 cycles of normal breathing continued by apnoea.

In both experimental and control groups participants walked on a treadmill at 5.5 km/h with 5º inclination for 6 minutes. The Control group (CG) performed this protocol breathing normally.