Delayed onset of electromyographic activity of vastus medialis obliquus relative to vastus lateralis in subjects with patellofemoral pain syndrome

Cowan, SM, Bennell, KL, Hodges, PW, Crossley, KM and McConnell, J (2001) Delayed onset of electromyographic activity of vastus medialis obliquus relative to vastus lateralis in subjects with patellofemoral pain syndrome. Archives of Physical Medicine And Rehabilitation, 82 2: 183-189. doi:10.1053/apmr.2001.19022


Author Cowan, SM
Bennell, KL
Hodges, PW
Crossley, KM
McConnell, J
Title Delayed onset of electromyographic activity of vastus medialis obliquus relative to vastus lateralis in subjects with patellofemoral pain syndrome
Journal name Archives of Physical Medicine And Rehabilitation   Check publisher's open access policy
ISSN 0003-9993
Publication date 2001-01-01
Year available 2001
Sub-type Article (original research)
DOI 10.1053/apmr.2001.19022
Open Access Status Not yet assessed
Volume 82
Issue 2
Start page 183
End page 189
Total pages 7
Place of publication Philadelphia
Publisher W B Saunders Co
Language eng
Abstract Objective: To determine whether electromyographic (EMG) onsets of vastus medialis obliquus (VMO) and vastus lateralis (VL) are altered in the presence of patellofemoral pain syndrome (PFPS) during the functional task of stair stepping. Design: Cross-sectional. Setting: University laboratory. Patients: Thirty-three subjects with PFPS and 33 asymptomatic controls. Interventions: Subjects ascended and descended a set of stairs-2 steps, each 20-cm high-at usual stair-stepping pace. EMG readings of VMO and VL taken on middle stair during step up (concentric contraction) and step down (eccentric contraction). Main Outcome Measures: Relative difference in onset of surface EMG activity of VMO compared with VL during a stair-stepping task. EMG onsets were determined by using a computer algorithm and were verified visually. Results: In the PFPS population, the EMG onset of VL occurred before that of VMO in both the step up and step down phases of the stair-stepping task (p < .05). In contrast, no such differences occurred in the onsets of EMG activity of VMO and VL in either phase of the task for the control subjects. Conclusion: This finding supports the hypothesized relationship between changes in the timings of activity of the vastimuscles and PFPS. This finding provides theoretical rationale to support physiotherapy treatment commonly used in the management of PFPs.
Keyword Rehabilitation
Sport Sciences
Patellofemoral Pain Syndrome
Knee
Muscles
Electromyography
Muscle-activity
Stabilization
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Health and Rehabilitation Sciences Publications
 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 232 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 278 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Mon, 13 Aug 2007, 22:10:53 EST