The invention relates to an apparatus and a method for monitoring the autonomous nervous system in an individual, especially for detecting pain, by utilizing spontaneous change in skin conductance. A first liquid is contained in the bag. Actuators lengthen or shorten to expand or contract the flexure members. Other embodiments can use smaller quantities. According to the invention, means are provided which suction at least a part of the exhaust gas exiting the fuel cell and feed said gas to the inflow distributor unit for recirculation. In another embodiment, the temperature compensating outdoor wall padding apparatus may employ a resilient cover, stretchable in 4 directions and pre-tensioned to provide tension on the resilient cover minimizing the possibility of wrinkling of the resilient cover due to a change in temperature.