IG Horsley
Does a SLAP lesion affect shoulder muscle recruitment as measured by EMG activity during a rugby tackle?
Horsley, IG; Herrington, LC; Rolf, C
Abstract
Background: The study objective was to assess the influence of a SLAP lesion on onset of EMG activity in shoulder muscles during a front on rugby football tackle within professional rugby players.
Methods: Mixed cross-sectional study evaluating between and within group differences in EMG onset times. Testing was carried out within the physiotherapy department of a university sports medicine clinic. The test group consisted of 7 players with clinically diagnosed SLAP lesions, later verified on arthroscopy. The reference group consisted of 15 uninjured and full time professional rugby players from within the same playing squad. Controlled tackles were performed against a tackle dummy. Onset of EMG activity was assessed from surface EMG of Pectorialis Major, Biceps Brachii, Latissimus Dorsi, Serratus Anterior and Infraspinatus muscles relative to time of impact. Analysis of differences in activation timing between muscles and limbs (injured versus non-injured side and non injured side versus matched reference group).
Results: Serratus Anterior was activated prior to all other muscles in all (P = 0.001-0.03) subjects. In the SLAP
injured shoulder Biceps was activated later than in the non-injured side. Onset times of all muscles of the noninjured shoulder in the injured player were consistently earlier compared with the reference group. Whereas, within
the injured shoulder, all muscle activation timings were later than in the reference group.
Conclusions: This study shows that in shoulders with a SLAP lesion there is a trend towards delay in activation time of Biceps and other muscles with the exception of an associated earlier onset of activation of Serratus anterior, possibly due to a coping strategy to protect glenohumeral stability and thoraco-scapular stability. This
trend was not statistically significant in all cases.
Citation
Horsley, I., Herrington, L., & Rolf, C. (2010). Does a SLAP lesion affect shoulder muscle recruitment as measured by EMG activity during a rugby tackle?. Journal of Orthopaedic Surgery and Research, 5(1), 12. https://doi.org/10.1186/1749-799X-5-12
Journal Article Type | Article |
---|---|
Publication Date | Jan 1, 2010 |
Deposit Date | May 13, 2011 |
Publicly Available Date | Apr 5, 2016 |
Journal | Journal of Orthopaedic Surgery and Research |
Publisher | Springer Verlag |
Peer Reviewed | Peer Reviewed |
Volume | 5 |
Issue | 1 |
Pages | 12 |
DOI | https://doi.org/10.1186/1749-799X-5-12 |
Publisher URL | http://dx.doi.org/10.1186/1749-799X-5-12 |
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