The increasing use of wireless networks and the constant miniaturization of electrical devices have empowered the development of Wireless Body Area Networks (WBANs). WBAN is designed to operate autonomously by establishing a wireless communication link. Various medical sensors and appliances are attached or implanted inside and outside of a human body. The media access control (MAC) layer plays an important role in deciding the energy efficiency. We do the research on the adaptive energy efficient Medium Access Control protocol used in WBAN, so to increase the network lifetime. The proposed protocols show increase in common node remaining energy, cluster node remaining energy, BAN co-or node remaining energy and decreasing in delay. This is achieved because of dynamic duty cycle and priorities based message passing schemes.