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A WBAN node may be working in two monitoring modes,all-transmit mode and few-transmit mode.Every mode has its own usage scenarios.To effectively prolong its lifetime,a node should be working in few-transmit mode as much as possible.An adaptive medium access control(MAC)protocol is specially designed to serve the nodes working in few-transmit mode.Experimental results show the proposed MAC protocol can improve the energy efficiency and satisfy the data delivery delay demands simultaneously.