Browsing University of Waterloo by Author "Dickerson, Clark R."
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Arm posture influences on regional supraspinatus and infraspinatus activation in isometric arm elevation efforts
Alenabi, Talia; Whittaker, Rachel; Kim, Soo Y.; Dickerson, Clark R. (Elsevier, 2019-02)This study aimed to evaluate the effect of arm posture on activation of the anterior and posterior regions of supraspinatus and the superior and middle regions of infraspinatus during resisted isometric arm elevations. ... -
Comparison of model-predicted and measured moment arms for the rotator cuff muscles
Gatti, Christopher J.; Dickerson, Clark R.; Chadwick, Edward K.; Mell, Amy G.; Hughes, Richard E. (Elsevier, 2007-07)Background The ability of mathematical models of the shoulder to accurately replicate physiological muscle moment arms is unknown. The purpose of this study was to compare model-predicted and experimentally measured moment ... -
Differential regional pectoralis major activation indicates functional diversity in healthy females
Lulic-Kuryllo, Tea; Negro, Francesco; Jiang, Ning; Dickerson, Clark R. (Elsevier, 2022-01)Pectoralis major activation enables the performance of several upper extremity movements. Its regional activation, however, is not documented in healthy females. This work used high-density surface electromyography to ... -
Evaluation of regression-based 3-D shoulder rhythms
Xu, Xu; Dickerson, Clark R.; Lin, Jia-hua; McGorry, Raymond W. (Elsevier, 2016-08)The movements of the humerus, the clavicle, and the scapula are not completely independent. The coupled pattern of movement of these bones is called the shoulder rhythm. To date, multiple studies have focused on providing ... -
Maximal voluntary isometric contraction tests for normalizing electromyographic data from different regions of supraspinatus and infraspinatus muscles: Identifying reliable combinations
Alenabi, Talia; Whittaker, Rachel; Kim, Soo Y.; Dickerson, Clark R. (Elsevier, 2018-08-01)This study aimed to identify optimal sets of maximal voluntary isometric contractions (MVICs) for normalizing EMG data from anterior and posterior regions of the supraspinatus, and superior, middle and inferior regions of ... -
Neural control of the healthy pectoralis major from low-to-moderate isometric contractions
Lulic-Kuryllo, Tea; Thompson, Christopher K.; Jiang, Ning; Negro, Francesco; Dickerson, Clark R. (American Physiological Society, 2021-07-01)The pectoralis major critically enables arm movement in several directions. However, its neural control remains unknown. High-density electromyography (HD-sEMG) was acquired from the pectoralis major in two sets of experiments ... -
Normative kinematics of reaching and dexterity tasks: moving towards a quantitative baseline for Functional Capacity Evaluations(FCEs)
Lang, Angelica E.; Dickerson, Clark R. (Taylor and Francis, 2017-12-15)Purpose: This work generates a comprehensive description of upper extremity and torso kinematics of a healthy population during reaching and dexterity Functional Capacity Evaluation (FCE) tasks. Methods: Upper limb and ... -
Regional activation of anterior and posterior supraspinatus differs by plane of elevation, hand load and elevation angle
Cudlip, Alan Christian; Dickerson, Clark R. (Elsevier, 2018-12-01)The supraspinatus is one of the muscles of the rotator cuff, and growing research on fibre type composition and mechanical advantages in specific postures suggest this muscle may have distinct anterior and posterior regions. ... -
Regional activation of supraspinatus and infraspinatus sub-regions during dynamic tasks performed with free weights
Calver, Ronelle; Alenabi, Talia; Cudlip, Alan Christian; Dickerson, Clark R.; Mondal, Prosanta; Kim, Soo Y. (Elsevier, 2022-02)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 ... -
Three-dimensional comparison of static and dynamic scapular motion tracking techniques
MacLean, Kathleen F. E.; Chopp, Jaclyn N.; Grewal, Tej-Jaskirat; Picco, Bryan R.; Dickerson, Clark R. (Elsevier, 2014-02)The shoulder is complex and comprised of many moving parts. Accurately measuring shoulder rhythm is difficult. To classify shoulder rhythm and identify pathological movement, static measures have been the preferred method. ...