Relationships between timing of muscle excitation and impaired motor performance during cyclical lower extremity movement in post-stroke hemiplegia

S. Kautz
1998 Brain  
We used an ergometer pedalling paradigm to relate abnormalities in the timing of muscle excitation to the impaired ability to perform mechanical work in the plegic lower limbs of persons with hemiplegia. The EMGs of seven leg muscles and pedal forces were measured bilaterally during pedalling for 15 persons with hemiplegia and 12 neurologically intact age-matched control subjects. Subjects were asked to pedal at a moderate workload (135 J) and cadence (40 r.p.m.). While intersubject variability
more » ... subject variability was high, the external mechanical work output of the plegic leg was significantly less (from 79.6% to -28.9% of the work produced by average leg of control subjects) as a result of less positive Abbreviations: BF ϭ biceps femoris; IEMG ϭ integrated EMG; MG ϭ medial gastrocnemius; RF ϭ rectus femoris; SM ϭ semimembranosus; SO ϭ soleus; TA ϭ tibialis anterior; VM ϭ vastus medialis; W C ϭ net external mechanical work done by each limb of control subject; W P ϭ net external mechanical work done by the plegic limb
doi:10.1093/brain/121.3.515 pmid:9549527 fatcat:5l2xfqxtwzbsdectyz65ox53iq