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https://www.readbyqxmd.com/read/27918696/validation-of-inertial-measurement-units-for-upper-body-kinematics
#1
Melissa M B Morrow, Bethany Lowndes, Emma Fortune, Kenton R Kaufman, Susan Hallbeck
The purpose of this study was to validate a commercially available IMU system against a standard lab-based motion capture system for the measurement of shoulder elevation, elbow flexion, trunk flexion/extension and neck flexion/extension kinematics. The validation analyses were applied to six surgical faculty members performing a standard, simulated surgical training task that mimics minimally invasive surgery. Three-dimensional joint kinematics were simultaneously recorded by an optical motion capture system and an IMU system with six sensors placed on the head, chest, and bilateral upper and lower arms...
December 5, 2016: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/27908458/inter-rater-reliability-of-shoulder-measurements-in-middle-aged-women
#2
A De Groef, M Van Kampen, N Vervloesem, E Clabau, M-R Christiaens, P Neven, I Geraerts, F Struyf, N Devoogdt
OBJECTIVES: To investigate inter-rater reliability of a set of shoulder measurements including inclinometry [shoulder range of motion (ROM)], acromion-table distance and pectoralis minor muscle length (static scapular positioning), upward rotation with two inclinometers (scapular kinematics) and pain pressure thresholds (muscle tenderness) in middle-aged women. DESIGN: Observational study. PARTICIPANTS: Thirty symptom-free middle-aged women (first cohort) were measured by two raters...
July 20, 2016: Physiotherapy
https://www.readbyqxmd.com/read/27900708/can-posterior-capsular-stretching-rehabilitation-protocol-change-scapula-kinematics-in-asymptomatic-baseball-pitchers
#3
A Pellegrini, P Tonino, D Salazar, K Hendrix, I Parel, A Cutti, P Paladini, F Ceccarelli, G Porcellini
PURPOSE: Scapular dyskinesis is a recognized cause of shoulder pain in the throwing shoulder of baseball pitchers and athletes who participate in overhead sports. Past studies have assessed scapular kinematics using electromagnetic tracking devices and have shown a correlation between posterior shoulder tightness and forward scapular posture. The purpose of our study is to evaluate the scapular kinematics, before and after a 4-week posterior stretching protocol in asymptomatic pitchers...
December 2016: Musculoskeletal Surgery
https://www.readbyqxmd.com/read/27872403/biomechanical-analysis-of-weighted-ball-exercises-for-baseball-pitchers
#4
Glenn S Fleisig, Alek Z Diffendaffer, Kyle T Aune, Brett Ivey, Walter A Laughlin
BACKGROUND: Weighted-ball throwing programs are commonly used in training baseball pitchers to increase ball velocity. The purpose of this study was to compare kinematics and kinetics among weighted-ball exercises with values from standard pitching (ie, pitching standard 5-oz baseballs from a mound). HYPOTHESIS: Ball and arm velocities would be greater with lighter balls and joint kinetics would be greater with heavier balls. STUDY DESIGN: Controlled laboratory study...
November 21, 2016: Sports Health
https://www.readbyqxmd.com/read/27855670/influence-of-disruption-of-the-acromioclavicular-and-coracoclavicular-ligaments-on-glenohumeral-motion-a-kinematic-evaluation
#5
Kempland C Walley, Babak Haghpanah, Andreas Hingsammer, Ethan R Harlow, Ashkan Vaziri, Joseph P DeAngelis, Ara Nazarian, Arun J Ramappa
BACKGROUND: Changes to the integrity of the acromioclavicular (AC) joint impact scapulothoracic and clavicular kinematics. AC ligaments provide anterior-posterior stability, while the coracoclavicular (CC) ligaments provide superior-inferior stability and a restraint to scapular internal rotation. The purpose of this cadaveric study was to describe the effect of sequential AC and CC sectioning on glenohumeral (GH) kinematics during abduction (ABD) of the arm. We hypothesized that complete AC ligament insult would result in altered GH translation in the anterior-posterior plane during abduction, while subsequent sectioning of both CC ligaments would result in an increasing inferior shift in GH translation...
November 17, 2016: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/27834563/upper-extremity-and-cue-kinematics-and-shoulder-muscles-emg-activity-of-novus-players-of-different-skill-levels
#6
Viire Talts, Jaan Ereline, Tatjana Kums, Mati Pääsuke, Helena Gapeyeva
Our aim with the present study was to compare upper extremity and cue kinematics, and electromyographic (EMG) activation of shoulder muscles, during novus (a special form of billiards) shots of different difficulty levels. Ten proficient and ten less-skilled novus players performed three types of novus shots (penalties, cuts, rebounds) ten times each. During each shot, elbow flexion and cue-forearm angles (using a movement analysis system), and surface EMG activity of the trapezius, posterior and lateral deltoid muscles of each subject's dominant side, were measured...
November 11, 2016: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/27821310/differences-in-motor-variability-among-individuals-performing-a-standardized-short-cycle-manual-task
#7
Jonas Sandlund, Divya Srinivasan, Marina Heiden, Svend Erik Mathiassen
Motor variability (MV) has been suggested to be a determinant of the risk for developing musculoskeletal disorders in repetitive work. In this study we examined whether individuals consistently differed in the extent of motor variability when performing a standardized short-cycle manual task. On three separate days, arm kinematics was recorded in 14 healthy subjects performing a pipetting task, transferring liquid from a pick-up tube to eight target tubes with a cycle time of 2.8s. Cycle-to-cycle standard deviations (SD) of a large selection of shoulder and elbow kinematic variables, were processed using principal component analysis (PCA)...
November 4, 2016: Human Movement Science
https://www.readbyqxmd.com/read/27809700/an-examination-of-the-correlation-amongst-trunk-flexibility-x-factor-and-clubhead-speed-in-skilled-golfers
#8
Christopher Joyce
Skilled golfers are reported to be more flexible than lesser able golfers, which may assist in increased x-factor (shoulder-pelvis separation) at the top of the backswing. However, it is unknown if increased flexibility produces faster clubhead speed. The aim of this study was to investigate the correlations amongst trunk flexibility and x-factor, as well as the association between flexibility and clubhead speed in low handicap golfers. Fifteen low handicap male golfers who displayed a modern swing, had their trunk static anatomical end-range of motion (flexibility) and driver swing kinematics were measured...
November 4, 2016: Journal of Sports Sciences
https://www.readbyqxmd.com/read/27793408/main-component-of-soft-tissue-artifact-of-the-upper-limbs-with-respect-to-different-functional-daily-life-and-sports-movements
#9
Y Blache, R Dumas, A Lundberg, M Begon
Soft tissue artifact (STA) is the main source of error in kinematic estimation of human movements based on skin markers. Our objective was to determine the components of marker displacements that best describe STA of the shoulder and arm (i.e. clavicle, scapula and humerus). Four participants performed arm flexion and rotation, a daily-life and a sports movement. Three pins with reflective markers were inserted into the clavicle, scapula and humerus. In addition, up to seven skin markers were stuck on each segment...
October 20, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/27785550/the-effects-of-obstacle-proximity-on-aperture-crossing-behaviours
#10
Carmen S Baker, Michael E Cinelli
Affordance theory and behavioural dynamics have been used as theoretical constructs to explain how individuals interact with the environment in order to avoid obstacles. Features of obstacle distance and multiple obstacle avoidance have been discussed in unique studies, yet the interactions of these environmental features have yet to be explored. The purpose of this study was to asses the effects of obstacle distance, relative to the goal, on aperture crossing strategies. Kinematics and gaze behaviours were assessed in a cohort of female young adults (N = 24, 21...
October 26, 2016: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/27769843/effects-of-a-stretching-protocol-for-the-pectoralis-minor-on-muscle-length-function-and-scapular-kinematics-in-individuals-with-and%C3%A2-without-shoulder-pain
#11
Dayana P Rosa, John D Borstad, Lívia S Pogetti, Paula R Camargo
STUDY DESIGN: Parallel-group intervention with repeated measures. INTRODUCTION: Shortening of the pectoralis minor (PM) may contribute to alterations in scapular kinematics. PURPOSE OF THE STUDY: To evaluate the effects of a stretching protocol on function, muscle length, and scapular kinematics in subjects with and without shoulder pain. METHODS: A sample of 25 patients with shoulder pain and 25 healthy subjects with PM tightness performed a daily stretching protocol for 6 weeks...
October 18, 2016: Journal of Hand Therapy: Official Journal of the American Society of Hand Therapists
https://www.readbyqxmd.com/read/27756724/effect-of-swim-training-on-the-physical-characteristics-of-competitive-adolescent-swimmers
#12
Elizabeth E Hibberd, Kevin G Laudner, Kristen L Kucera, David J Berkoff, Bing Yu, Joseph B Myers
BACKGROUND: Subacromial space distance and forward head and shoulder posture are common characteristics resulting from swim training. These alterations can cause abnormal scapular kinematics and positioning, potentially increasing compression of structures in the subacromial space and increasing the risk for the development of swimmer's shoulder. PURPOSE: To evaluate the effect of the swim training season on subacromial space distance and forward head and forward shoulder posture as well as to determine the relationship between these variables...
November 2016: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/27756271/kinematic-analysis-of-work-related-musculoskeletal-loading-of-trunk-among-dentists-in-germany
#13
Daniela Ohlendorf, Christina Erbe, Imke Hauck, Jennifer Nowak, Ingo Hermanns, Dirk Ditchen, Rolf Ellegast, David A Groneberg
BACKGROUND: In Germany, about 86.7 % of the dentists have stated to suffer from pain in the neck and shoulder region. These findings are predominantly based on surveys. Therefore the objective of this study is to conduct a kinematic analysis of occupational posture in dentistry. METHODS: Twenty one dentists (11 f/10 m; age: 40.1 ± 10.4 years) have participated in this examination. The CUELA-System was used to collect kinematic data of the activities on an average dental workday...
October 18, 2016: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/27749154/portable-myoelectric-brace-use-increases-upper-extremity-recovery-and-participation-but-does-not-impact-kinematics-in-chronic-poststroke-hemiparesis
#14
Nienke W Willigenburg, Michael P McNally, Timothy E Hewett, Stephen J Page
The authors examined the efficacy of an 8-week regimen combining repetitive task-specific practice (RTP) with a myoelectric brace (RTP+Myomo) on paretic upper extremity (UE; use in valued activities, perceived recovery, and reaching kinematics) in 12 subjects (4 men; M age = 53.5 years; mean time poststroke = 61.7 months). Seven subjects were administered RTP+Myomo therapy, and 5 were administered RTP only. Both groups participated in individualized, 45-min therapy sessions occurring 3 days/week over an 8-week period...
October 17, 2016: Journal of Motor Behavior
https://www.readbyqxmd.com/read/27734020/effects-of-rotator-cuff-pathology-and-physical-therapy-on-in-vivo-shoulder-motion-and-clinical-outcomes-in-patients-with-a-symptomatic-full-thickness-rotator-cuff-tear
#15
Timothy G Baumer, Derek Chan, Veronica Mende, Jack Dischler, Roger Zauel, Marnix van Holsbeeck, Daniel S Siegal, George Divine, Vasilios Moutzouros, Michael J Bey
BACKGROUND: Physical therapy (PT) is often prescribed for patients with rotator cuff tears. The extent to which PT influences strength, range of motion (ROM), and patient-reported outcomes has been studied extensively, but the effect of PT on in vivo joint kinematics is not well understood. PURPOSE: To assess the influence of symptomatic rotator cuff pathology and the effects of PT on shoulder motion, strength, and patient-reported outcomes. STUDY DESIGN: Controlled laboratory study...
September 2016: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/27725798/holding-a-handle-for-balance-during-continuous-postural-perturbations-immediate-and-transitionary-effects-on-whole-body-posture
#16
Jernej Čamernik, Zrinka Potocanac, Luka Peternel, Jan Babič
When balance is exposed to perturbations, hand contacts are often used to assist postural control. We investigated the immediate and the transitionary effects of supportive hand contacts during continuous anteroposterior perturbations of stance by automated waist-pulls. Ten young adults were perturbed for 5 min and required to maintain balance by holding to a stationary, shoulder-high handle and following its removal. Center of pressure (COP) displacement, hip, knee and ankle angles, leg and trunk muscle activity and handle contact forces were acquired...
2016: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/27705061/errors-in-shoulder-joint-position-sense-mainly-come-from-the-glenohumeral-joint
#17
Yin-Liang Lin, Andrew Karduna
While synchronous movement of glenohumeral and scapulothoracic joints has been emphasized in previous kinematics studies, most investigations of shoulder joint position sense have treated the shoulder complex as a single joint. The purposes of this study were to investigate the joint position sense errors of the humerothoracic, glenohumeral and scapulothoracic joints at different elevation angles and to examine whether the errors of the glenohumeral and scapulothoracic joints contribute to the errors of the humerothoracic joint...
October 5, 2016: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/27697468/muscle-fatigue-effects-can-be-anticipated-to-reproduce-a-movement-kinematics-learned-without-fatigue
#18
Florian Monjo, Nicolas Forestier
Muscle fatigue modifies the gain between motor command magnitude and the mechanical muscular response. In other words, post-fatigue, central drives to the muscles must increase to maintain a particular submaximum mechanical output. In this study, we tested the hypothesis that this modified gain can be predicted by the central nervous system (CNS) during discrete ballistic movements. In two separate experiments, subjects were required to perform shoulder flexions in standing and sitting positions at submaximum target peak accelerations...
December 17, 2016: Neuroscience
https://www.readbyqxmd.com/read/27693966/scapular-dyskinesis-patterns-functional-disability-and-associated-factors-in-people-with-shoulder-disorders
#19
Tsun-Shun Huang, Chien-Ying Huang, Hsiang-Ling Ou, Jiu-Jenq Lin
BACKGROUND: Patterns of scapular dyskinesis have unique scapular kinematics and associated muscular activation. The characteristics of unique dyskinesis patterns may be associated with functional disability. OBJECTIVES: To investigate whether the shoulder function level and primary dysfunction items were different in unique dyskinesis pattern. The factors associated with shoulder dysfunction in different dyskinesis patterns were identified. DESIGN: Cross-sectional study...
December 2016: Manual Therapy
https://www.readbyqxmd.com/read/27676976/predictors-of-motor-outcomes-in-severe-sub-acute-stroke-patients-after-upper-limb-intensive-combined-robot-mediated-usual-care-training
#20
Christophe Duret, Anne Gaelle Grosmaire, Ophélie Courtial
OBJECTIVE: In stroke patients, motor impairments evaluated during the first few weeks usually predict upper limb motor outcomes after rehabilitation. However, a recent growing literature suggests that severe patients might not follow this principle [1]. This study aimed at exploring predictors of motor recovery after intensive training in that sub population of stroke patients. MATERIAL/PATIENTS AND METHODS: Thirty-eight patients with sub-acute hemiparesis (19 females, age 56±17 [19-87] years; time from stroke, 55±22 days) carried out 16 sessions (33±12 days) of robot-assisted adaptive training using a shoulder/elbow device integrated into conventional care...
September 2016: Annals of Physical and Rehabilitation Medicine
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