Although EMG has been available for
over four decades, relatively recent developments
in instrumentation and sophisticated
electronics have enabled
EMG to become a powerful technique
for studying muscle function and dysfunction.
Because the basis for EMG is
motor unit activity and because techniques
have been developed to record
single fiber,1
motor unit,2
or larger areas
of muscle by surface electrode,3
users
are faced with many practical and technical
considerations in the application
and interpretation of EMG in biomechanics.