The vastus medialis oblique: vastus lateralis electromyographic intensity ratio does not differ by gender in young participants without knee pathology

Hdl Handle:
http://hdl.handle.net/10149/94234
Title:
The vastus medialis oblique: vastus lateralis electromyographic intensity ratio does not differ by gender in young participants without knee pathology
Authors:
Bowyer, D. (Damien); Armstrong, M. (Mikaela); Dixon, J. (John); Smith, T. O. (Toby)
Affiliation:
University of Teesside. School of Health and Social Care.
Citation:
Bowyer, D. et al. (2008) 'The vastus medialis oblique: vastus lateralis electromyographic intensity ratio does not differ by gender in young participants without knee pathology', Physiotherapy, 94 (2), pp.168-173.
Publisher:
Elsevier
Journal:
Physiotherapy
Issue Date:
Jun-2008
URI:
http://hdl.handle.net/10149/94234
DOI:
10.1016/j.physio.2007.08.007
Abstract:
Objectives: To investigate whether there was a gender difference in the intensity of electromyographic (EMG) activity in vastus medialis oblique (VMO) relative to vastus lateralis (VL). Design: A cross-sectional observational study measuring EMG activity during stepping down from a step and during straight leg raise exercises. Setting: University campus laboratory. Participants: Two groups of healthy participants were tested, one female (mean age 23.5 years, n = 15) and one male (mean age 23.5 years, n = 15). Main outcome measures: Surface EMG activity (sampling rate 1000 Hz) was recorded from VMO and VL of the dominant limb during five repetitions of a step down activity and five repetitions of a straight leg raise exercise. The average intensity of the rectified and smoothed EMG activity from each activity was normalised to that elicited in a maximal quadriceps setting exercise. The ratio of normalised VMO:VL EMG intensity levels was calculated. Results: The median difference in the VMO:VL ratio between the groups was 0.11 [approximate 95% confidence interval (CI) -0.62 to 1.00] during step down and -0.07 (approximate 95% CI -0.26 to 0.20) during straight leg raise. Using Mann Whitney U-tests, these differences were not statistically significant (P = 0.648 and 0.619, respectively). Conclusions: This study found no gender difference in the VMO:VL EMG intensity ratio in asymptomatic participants. This suggests that the difference in incidence of patellofemoral pain syndrome between genders is not influenced by quadriceps intensity ratios, when participants are asymptomatic.
Type:
Article
Language:
en
Keywords:
electromyography; female; male; knee; vastus medialis oblique; vastus lateralis; quadriceps; patellofemoral pain
ISSN:
0031-9406
Rights:
Author can archive post-print (ie final draft post-refereeing). For full details see http://www.sherpa.ac.uk/romeo/ [Accessed 15/03/2010]
Citation Count:
0 [Scopus, 15/03/2010]

Full metadata record

DC FieldValue Language
dc.contributor.authorBowyer, D. (Damien)en
dc.contributor.authorArmstrong, M. (Mikaela)en
dc.contributor.authorDixon, J. (John)en
dc.contributor.authorSmith, T. O. (Toby)en
dc.date.accessioned2010-03-15T09:10:48Z-
dc.date.available2010-03-15T09:10:48Z-
dc.date.issued2008-06-
dc.identifier.citationPhysiotherapy; 94 (2): 168-173en
dc.identifier.issn0031-9406-
dc.identifier.doi10.1016/j.physio.2007.08.007-
dc.identifier.urihttp://hdl.handle.net/10149/94234-
dc.description.abstractObjectives: To investigate whether there was a gender difference in the intensity of electromyographic (EMG) activity in vastus medialis oblique (VMO) relative to vastus lateralis (VL). Design: A cross-sectional observational study measuring EMG activity during stepping down from a step and during straight leg raise exercises. Setting: University campus laboratory. Participants: Two groups of healthy participants were tested, one female (mean age 23.5 years, n = 15) and one male (mean age 23.5 years, n = 15). Main outcome measures: Surface EMG activity (sampling rate 1000 Hz) was recorded from VMO and VL of the dominant limb during five repetitions of a step down activity and five repetitions of a straight leg raise exercise. The average intensity of the rectified and smoothed EMG activity from each activity was normalised to that elicited in a maximal quadriceps setting exercise. The ratio of normalised VMO:VL EMG intensity levels was calculated. Results: The median difference in the VMO:VL ratio between the groups was 0.11 [approximate 95% confidence interval (CI) -0.62 to 1.00] during step down and -0.07 (approximate 95% CI -0.26 to 0.20) during straight leg raise. Using Mann Whitney U-tests, these differences were not statistically significant (P = 0.648 and 0.619, respectively). Conclusions: This study found no gender difference in the VMO:VL EMG intensity ratio in asymptomatic participants. This suggests that the difference in incidence of patellofemoral pain syndrome between genders is not influenced by quadriceps intensity ratios, when participants are asymptomatic.en
dc.language.isoenen
dc.publisherElsevieren
dc.rightsAuthor can archive post-print (ie final draft post-refereeing). For full details see http://www.sherpa.ac.uk/romeo/ [Accessed 15/03/2010]en
dc.subjectelectromyographyen
dc.subjectfemaleen
dc.subjectmaleen
dc.subjectkneeen
dc.subjectvastus medialis obliqueen
dc.subjectvastus lateralisen
dc.subjectquadricepsen
dc.subjectpatellofemoral painen
dc.titleThe vastus medialis oblique: vastus lateralis electromyographic intensity ratio does not differ by gender in young participants without knee pathologyen
dc.typeArticleen
dc.contributor.departmentUniversity of Teesside. School of Health and Social Care.en
dc.identifier.journalPhysiotherapyen
ref.citationcount0 [Scopus, 15/03/2010]en
or.citation.harvardBowyer, D. et al. (2008) 'The vastus medialis oblique: vastus lateralis electromyographic intensity ratio does not differ by gender in young participants without knee pathology', Physiotherapy, 94 (2), pp.168-173.-
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