Regional activation of supraspinatus and infraspinatus sub-regions during dynamic tasks performed with free weights
MetadataShow full item record
Growing evidence supports the existence of distinct anatomical sub-regions within supraspinatus and infraspinatus, but only recently has attention turned to exploring their potential functional differences. Using indwelling fine-wire electromyography, muscle activity was investigated from these sub-regions in 15 participants (mean 34 yr, 170 cm, 71.9 kg) during dynamic external rotation (ER), abduction, flexion, and scaption tasks with and without free weights corresponding to 50% and 75% of the participant’s five repetition maximum. Electromyography data were normalized to isometric and isokinetic maximal voluntary contractions and activation ratios for each sub-region compared. Differences in mean regional activation ratios for supraspinatus and infraspinatus varied by arm posture, but were not influenced by load. Relative activation of posterior supraspinatus was greater during an ER task performed in side lying compared to an ER task performed with 90° of humeral elevation in seated and prone postures. Relative activation of superior infraspinatus was greater during an ER task in prone and side lying postures compared to flexion and scaption. Similar results were found when comparing regional muscle activation ratios for infraspinatus between tasks regardless of normalization method employed. These findings may impact exercise selection in the non-operative management of rotator cuff tears.
Cite this version of the work
Ronelle Calver, Talia Alenabi, Alan Christian Cudlip, Clark R. Dickerson, Prosanta Mondal, Soo Y. Kim (2022). Regional activation of supraspinatus and infraspinatus sub-regions during dynamic tasks performed with free weights. UWSpace. http://hdl.handle.net/10012/18110
The following license files are associated with this item:
Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivatives 4.0 International
Showing items related by title, author, creator and subject.
Cycling use and attitudes towards cycling in Halifax Regional Municipality and the Region of Waterloo Clare, Benjamin (University of Waterloo, 2011-04-29)The purpose of this thesis is to explore bicycle use and attitudes towards cycling through case study analyses in Halifax Regional Municipality and the Region of Waterloo. There are two main sections of analyses; the first ...
Multi-Sectoral Perspectives on Regional Food Policy, Planning and Access to Food: A Case Study of Waterloo Region Wegener, Jessica (University of Waterloo, 2011-08-26)There is increasing interest in linking food system policies and land use planning practices to healthier diets and healthier communities. Little is known about the process of regional food system policy making or the ...
"Everybody should have choice": Municipal & Regional Planning, Social Policy, and Housing Options for Disabled Persons in Waterloo Region, Ontario McCulley, Amanda (University of Waterloo, 2021-01-13)The purpose of this study was to analyze how municipal planning impacts housing options for disabled people in the Waterloo region of Ontario. Through analysis of relevant local and provincial planning-related documents ...