Title :
A comparison of methods for estimating isometric recruitment curves in human quadriceps muscle
Author :
Beck, Heather ; Durfee, William
Author_Institution :
Dept. of Mech. Eng., MIT, Cambridge, MA, USA
Abstract :
A study in which five methods for estimating isometric recruitment curves of electrically stimulated muscle were tested on the quadriceps muscles of able-bodied human subjects is discussed. Two discrete methods, steady-state step response and peak impulse response, and three continuous methods were examined. The continuous methods were ramp deconvolution via an idealized impulse response, ramp deconvolution via a measured impulse response and ramp response shifted via correlation. The results showed that variation in estimates of recruitment curves were dependent on the method of measurement and means of post-processing. The step response method is the traditional procedure for estimating recruitment curves; however, the ramp methods all appeared to offer acceptable accuracy. The correlation method was simplest and fastest to process. The peak impulse method was less repeatable and often differed from the other methods in predicting the stimulation threshold
Keywords :
bioelectric phenomena; biomechanics; correlation methods; deconvolution; medical signal processing; muscle; neurophysiology; patient treatment; step response; transient response; continuous methods; correlation; curve estimation methods; discrete methods; electrically stimulated muscle; functional electrical stimulation; human quadriceps muscle; idealized impulse response; isometric recruitment curves; linear system block; measured impulse response; peak impulse response; post-processing; ramp deconvolution; ramp response; static nonlinear gain; steady-state step response; stimulation threshold; Correlation; Fatigue; Heat engines; Humans; Mechanical engineering; Muscles; Pulse generation; Recruitment; Steady-state; Testing;
Conference_Titel :
Bioengineering Conference, 1993., Proceedings of the 1993 IEEE Nineteenth Annual Northeast
Conference_Location :
Newark, NJ
Print_ISBN :
0-7803-0925-1
DOI :
10.1109/NEBC.1993.404416