III. SENSORS FOR HUMAN ACTIVITY MONITORING
In this section we will review a few sensors which are
commonly used for monitoring different human activities.
Sensors are fundamental elements of the whole monitoring
system and should measure the physiological parameters
of interest accurately and reliably over a long duration.
The rapid development of microelectronics, micromechanics,
integrated optics and other related technologies has enabled
the development of various kinds of smart sensors to sense
and measure data more efficiently and faster, with lower
energy consumption and less processing resources.
Body temperature is one of the common physiological
parameters measured by wearable sensors for human activity monitoring. The variation in temperature measured on the skin
can give an indication of what is happening with the person’s
body temperature and can be used to detect the symptoms of
medical stress that might lead to various health conditions,
including stroke, heart attacks and shock. The measurement
of body temperature is extremely useful for determining the
physiological condition as well as for other things such as
activity classification [20], [21], or even harvesting energy
from body heat