Patient health monitoring devices are flexible. Powerful ECG acquisition system is used at anytime and anywhere in the patient monitoring system. The increasing feasibility and convenience of mobile healthcare has already introduced several significant challenges in hospitals, healthcare providers, policy makers and patients. This study provides adaptive humming bird algorithm of light weight cryptography. This method has higher level of security over health care application with adaptive Humming Bird Algorithm for ECG acquisition systems which enables Intensive Care Monitoring. This study provides a key agreement scheme that allows neighboring nodes in BAN to share the common keys generated by electrocardiogram signal. The proposed ECG-humming bird key agreement scheme enables the secure communication over the WBAN. The experimental results are presented, which show that the proposed scheme provide better security performance in terms of false acceptance rate and false rejection rate than other approaches.