Abstract: Devices, systems, and methods for supporting the body of user are described. Devices, systems, and methods can employ a plurality of cells where each of the cells within the plurality of cells can comprise a bladder containing air or another compressible fluid supported by a base that forms a fluid-tight seal with the bladder The base and bladder can be constructed and arranged so that the bladder forms a rolling diaphragm portion with the base. The height and/or applied pressure in response to an applied load of such bladder may be adjustable substantially independent of the crosssectional shape and dimensions of the bladder. Each of the cells within the plurality of cells which may be a subset or all of the cells of a given support, can also comprise, or otherwise be operatively associated with its own: pressure sensor, height sensor, or both, and/or controllable inlet/outlet valve(s).

Abstract: The invention relates to a system for monitoring a physiological parameter of players engaged in a sports activity. The invention further relates to a method for evaluating and treating players when the parameter exceeds a predetermined level. The system measures, calculates and records the parameter and then alerts trained personnel to apply the method to evaluate and treat players. When the system is configured for use with football, hockey or lacrosse, the system generally includes reporting units, a sideline controller, a database, and a signaling device, such as a wireless personal digital assistant. The physiological parameter data measured and collected by the reporting units are processed by the sideline controller for meaningful analysis or use. When the physiological parameter(s) exceeds a predetermined threshold level the sideline controller generates an alert that is received by the signaling device, which is typically worn by sideline personnel, such as coaching staff or trainers.