The key advantage of using wireless sensor networks is a
node. Soon, MEMS [5] and nanotechnology will yield tiny,
low cost and low power node. This so tiny devices help make
the wearable sensor research possible.The well-known health care applications using wireless
sensor network is CodeBlue [5] project developed by Harvard
University. This application covers pre-hospital and inhospital
emergency
care
and
patient
rehabilitation.
Many
wireless
vital
signs
such
as pulse
oximeter,
blood pressure
and
two-lead
Electromyogram
(EKG)
were
developed
to
successfully
use
in
their
projects.