The present invention provides a bidirectional linkage single damping mechanism suitable for a leg exerciser. The channels are open to the outside through pores with at least two variable sizes. Further, a source of a p-type transistor that makes up one transistor in each pair of series connected transistors is coupled to the Matchline thereby further reducing the Matchline swing voltage and the overall power dissipation of the match detection circuit. The resulting breathing gas volume flow rate is detected and the volume is determined from the latter by integration. The dielectric layers have an opening located above the floating gate. The receive buffer is managed by determining a consumption rate at the client and adjusting the transmission rate of the server responsive to the determined consumption rate to manage the fill level of the receive buffer.