Brain, Vol 121, Issue 3 515-526, Copyright © 1998 by Oxford University Press
SA Kautz and DA Brown
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
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 work and more
negative work being done. The timing of EMG in individual plegic limb
muscles exhibited two distinct types of abnormalities that were
significantly correlated with this lesser work production: prolonged
excitation in the vastus medialis and phase- advanced excitation (both
early initiation and early termination) in the rectus femoris and
semimembranosus. These results suggest that muscles were differently
affected depending on their function, external power-producing muscles
(e.g. vastus medialis) showing prolonged excitation and muscles that
normally maintain crank progression during limb transitions (e.g.
semimembranosus) showing phase-advanced excitation.
ARTICLES
Relationships between timing of muscle excitation and impaired motor performance during cyclical lower extremity movement in post-stroke hemiplegia
Rehabilitation Research and Development Center, VA Palo Alto HCS, CA 94306, USA.
CiteULike 
Connotea 
Del.icio.us What's this?
This article has been cited by other articles:
|
|
 |
|
  L. Alibiglou, C. Lopez-Ortiz, C. B. Walter, and D. A. Brown Bilateral Limb Phase Relationship and Its Potential to Alter Muscle Activity Phasing During Locomotion J Neurophysiol, November 1, 2009; 102(5): 2856 - 2865. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 J. H. Buurke, A. V. Nene, G. Kwakkel, V. Erren-Wolters, M. J. IJzerman, and H. J. Hermens Recovery of Gait After Stroke: What Changes? Neurorehabil Neural Repair, November 1, 2008; 22(6): 676 - 683. [Abstract] [PDF]
|
|
|
|
 |
|
 K. J Sullivan, D. A Brown, T. Klassen, S. Mulroy, T. Ge, S. P Azen, C. J Winstein, and for the Physical Therapy Clinical Research Network Effects of Task-Specific Locomotor and Strength Training in Adults Who Were Ambulatory After Stroke: Results of the STEPS Randomized Clinical Trial Physical Therapy, December 1, 2007; 87(12): 1580 - 1602. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 M. Katz-Leurer, I. Sender, O. Keren, and Z. Dvir The influence of early cycling training on balance in stroke patients at the subacute stage. Results of a preliminary trial Clinical Rehabilitation, May 1, 2006; 20(5): 398 - 405. [Abstract] [PDF]
|
|
|
|
|
|
S. A. Kautz, C. Patten, and R. R. Neptune Does Unilateral Pedaling Activate a Rhythmic Locomotor Pattern in the Nonpedaling Leg in Post-Stroke Hemiparesis? J Neurophysiol, May 1, 2006; 95(5): 3154 - 3163. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
S. A. Kautz, P. W. Duncan, S. Perera, R. R. Neptune, and S. A. Studenski Coordination of Hemiparetic Locomotion after Stroke Rehabilitation Neurorehabil Neural Repair, September 1, 2005; 19(3): 250 - 258. [Abstract] [PDF]
|
|
|
|
|
|
S. A. Kautz and C. Patten Interlimb Influences on Paretic Leg Function in Poststroke Hemiparesis J Neurophysiol, May 1, 2005; 93(5): 2460 - 2473. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
D. A Brown, S. Nagpal, and S. Chi Limb-Loaded Cycling Program for Locomotor Intervention Following Stroke Physical Therapy, February 1, 2005; 85(2): 159 - 168. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
S. Schindler-Ivens, D. A. Brown, and J. D. Brooke Direction-Dependent Phasing of Locomotor Muscle Activity Is Altered Post-Stroke J Neurophysiol, October 1, 2004; 92(4): 2207 - 2216. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
C. G Canning, L. Ada, R. Adams, and N. J O'Dwyer Loss of strength contributes more to physical disability after stroke than loss of dexterity Clinical Rehabilitation, March 1, 2004; 18(3): 300 - 308. [Abstract] [PDF]
|
|
|
|
 |
|
 W. M. Landau and S. A. Sahrmann Preservation of Directly Stimulated Muscle Strength in Hemiplegia Due to Stroke Arch Neurol, September 1, 2002; 59(9): 1453 - 1457. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
L. H. Ting, S. A. Kautz, D. A. Brown, and F. E. Zajac Contralateral Movement and Extensor Force Generation Alter Flexion Phase Muscle Coordination in Pedaling J Neurophysiol, June 1, 2000; 83(6): 3351 - 3365. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
C. C. Raasch and F. E. Zajac Locomotor Strategy for Pedaling: Muscle Groups and Biomechanical Functions J Neurophysiol, August 1, 1999; 82(2): 515 - 525. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
L. H. Ting, S. A. Kautz, D. A. Brown, and F. E. Zajac Phase Reversal of Biomechanical Functions and Muscle Activity in Backward Pedaling J Neurophysiol, February 1, 1999; 81(2): 544 - 551. [Abstract] [Full Text] [PDF]
|
|