During prolonged experiments the influence of knee angular velocity, and stimulation parameters (interpulse interval (IPI), duty cycle (DC), number of pulses per cycle (NP)) on fatigue-induced torque decline of paralyzed human quadriceps was studied. Identification of torque-angle and -angular velocity was also performed. The overall loss of maximum torque (MT) and torque-time integral ('lTI) per cycle during sustained intermittent stimulation during isokinetic movement had a typical exponential decay reaching asymptotic values. Larger knee velocities resulted in a significantly faster and relative larger decay of MT and TTI. The rate and relative magnitude of fatigue during concentric contractions are in direct relation to NP. The results may be valuable in the design of optimal control systems for FES which pursue minimization of muscle fatigue.
|Title of host publication||Proceeding of the 14th Annual International Conference of the IEEE Engineering in Medicine and Biology Society|
|Place of Publication||Paris, France|
|Number of pages||2|
|Publication status||Published - 29 Oct 1992|
|Event||14th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 1992 - Paris, France|
Duration: 29 Oct 1992 → 1 Nov 1992
Conference number: 14
|Conference||14th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 1992|
|Period||29/10/92 → 1/11/92|
Franken, H. M., Franken, H. M., Veltink, P. H., Fidder, M., & Boom, H. B. K. (1992). Fatigue of intermittently stimulated quadriceps during imposed cyclical lower leg movements. In Proceeding of the 14th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (pp. 1341-1342). Paris, France: IEEE.