Simultaneous feedforward recruitment of the vasti in untrained postural tasks can be restored by physical therapy

Cowan, Sallie M., Bennell, Kim L., Hodges, Paul W., Crossley, Kay M. and McConnell, Jenny (2003) Simultaneous feedforward recruitment of the vasti in untrained postural tasks can be restored by physical therapy. Journal of Orthopaedic Research, 21 3: 553-558. doi:10.1016/S0736-0266(02)00191-2


Author Cowan, Sallie M.
Bennell, Kim L.
Hodges, Paul W.
Crossley, Kay M.
McConnell, Jenny
Title Simultaneous feedforward recruitment of the vasti in untrained postural tasks can be restored by physical therapy
Journal name Journal of Orthopaedic Research   Check publisher's open access policy
ISSN 0736-0266
1554-527X
Publication date 2003-05
Sub-type Article (original research)
DOI 10.1016/S0736-0266(02)00191-2
Volume 21
Issue 3
Start page 553
End page 558
Total pages 6
Editor J A Buckwater
T M Wright
Place of publication Hoboken, NJ, United States
Publisher John Wiley & Sons
Collection year 2003
Language eng
Subject 321024 Rehabilitation and Therapy - Occupational and Physical
730303 Occupational, speech and physiotherapy
Formatted abstract
Background and purpose:
Physical therapy rehabilitation strategies are commonly directed at the alteration of muscle recruitment in functional movements. The aim of this study was to investigate whether feedforward strategies of the vasti in people with patellofemoral pain syndrome can be changed by a physical therapy treatment program in a randomised, double blind, placebo controlled trial.

Subjects:

Forty (25 female, 15 male) subjects aged 40 yrs or less (27.2 +/- 7.8 yrs).

Methods:
Subjects were allocated to either a placebo treatment or a physical therapy intervention program. The postural challenge used as the outcome measure was not included in the training program. Electromyography (EMG) onsets of vastus medialis obliquus (VMO), vastus lateralis (VL), tibialis anterior and soleus were assessed before and after the six week standardised treatment programs.

Results:
At baseline the EMG onset of VL occurred prior to that of VMO in both subject groups. Following physical therapy intervention there was a significant change in the time of onset of EMG of VMO compared to VL with the onsets occurring simultaneously. This change was associated with a reduction in symptoms. In contrast, following placebo intervention the EMG onset of VL still occurred prior to that of VMO.

Conclusion and discussion:
The results indicate that the feedforward strategy used by the central nervous system to control the patella can be restored. Importantly, the data suggest that this intervention produced a change that was transferred to a task that was not specifically included in the training program. Furthermore, the change in motor control was associated with clinical improvement in symptoms.
Keyword Orthopedics
Motor Control
Quadriceps
Training
Electromyography
Postural Perturbation
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ
Additional Notes Article first published online: 1 January 2006.

 
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Created: Wed, 15 Aug 2007, 01:27:45 EST