Abstract: Apparatus for passively exercising at least a portion of a human body includes an inflatable bag which exerts a force during inflation, an electrical air pump disposed in fluid communication with the bag for supplying an atmospheric air medium to inflate the bag, a solenoid valve disposed in fluid communication with the inflatable bag for discharging the atmospheric air medium to deflate the bag and a timing control circuit coupled to the pump and to the solenoid valve for cyclically inflating and deflating the bag. The control circuit includes a dual integrated circuit timer operable with an external resistor-capacitor timer control to provide such cyclical inflation and deflation of the bag. The duration of the cycle is adjusted with a variable resistor coupled to the dual timer. The apparatus can be integrated into a seat or an article of furniture.

Abstract: Apparatus for passively exercising at least a portion of a human body includes an inflatable bag which exerts a force during inflation, an electrical air pump disposed in fluid communication with the bag for supplying an atmospheric air medium to inflate the bag, a solenoid valve disposed in fluid communication with the inflatable bag for discharging the atmospheric air medium to deflate the bag and a timing control circuit coupled to the pump and to the solenoid valve for cyclically inflating and deflating the bag. The control circuit includes a dual integrated circuit timer operable with an external resistor-capacitor timer control to provide such cyclical inflation and deflation of the bag. The duration of the cycle is adjusted with a variable resistor coupled to the dual timer. The apparatus can be integrated into a seat or an article of furniture.