Human beings can suffer from both physical & mental fatigue. The therapy has been designed based on a "stiffness feeling" as physical fatigue, & now the stress sensor, senses the degree of "stress" i. e. mental fatigue. The massage lounger's massage promotes relaxation according to the stress level. The HEC-DR8700 massage lounger offers treatment of both the mental & physical aspects through the stiffness sensor & stress sensor working together. Sanyo massage loungers are closer to the techniques of a professional masseur than ever before. Zero-Gravity Position In the Zero Gravity position, the chair maintains support to the back while the seat adjusts to the optimum 30° angle & footrest elevates the legs. This position is most beneficial, as it relieves stress on the back & allows oxygen & blood to flow more freely throughout the body. Once in the Zero Gravity position, exclusive GK Rollers emulate the "grasping & kneading” of a live massage. The thumb-shaped jointed rollers reach out up to 6 inches to comfortably squeeze the neck & tops of the shoulders. The massage continues down the back by stroking & tapping to the tailbone. The legs & feet are treated to an exclusive multi-point Shiatsu massage via airbags that deliver deep & penetrating relief.