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https://www.readbyqxmd.com/read/28633608/biomechanics-of-increased-spin-velocity-of-flying-discs-during-forehand-throws-by-skilled-and-unskilled-throwers
#1
Kei Sasakawa, Koji Umegaki, Shinji Sakurai
We aimed to assess the relationship between throwing distance and kinematic release parameters of the flying disc in unskilled throwers, and to assess the relationship between kinetic variables acting on flying discs and the change in spin velocity during long forehand throws by skilled and unskilled throwers. Ten skilled and eleven unskilled throwers performed throws at maximum effort. Reflective marker positions on the disc and body were recorded with a 3D motion capture system during the throws to derive kinematic variables of a disc and kinetic variables acting on the disc...
June 20, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28632288/all-arthroscopic-superior-shoulder-capsule-reconstruction-with-partial-rotator-cuff-repair
#2
E Grant Sutter, Jonathan A Godin, Grant E Garrigues
Massive irreparable rotator cuff tears are difficult to treat. Although several treatment options exist, none provides superior long-term results. There is no consensus on optimal surgical technique. Superior capsular reconstruction is an operative treatment option aimed at restoring native biomechanics of the glenohumeral joint by providing a restraint to superior subluxation. Partial rotator cuff repair for massive tears has also been shown to improve shoulder kinematics and can be performed in conjunction with superior capsule reconstruction...
June 20, 2017: Orthopedics
https://www.readbyqxmd.com/read/28632057/rotation-sequence-to-report-humerothoracic-kinematics-during-3d-motion-involving-large-horizontal-component-application-to-the-tennis-forehand-drive
#3
Thomas Creveaux, Violaine Sevrez, Raphaël Dumas, Laurence Chèze, Isabelle Rogowski
The aim of this study was to examine the respective aptitudes of three rotation sequences (YtXf'Yh'', ZtXf'Yh'', and XtZf'Yh'') to effectively describe the orientation of the humerus relative to the thorax during a movement involving a large horizontal abduction/adduction component: the tennis forehand drive. An optoelectronic system was used to record the movements of eight elite male players, each performing ten forehand drives. The occurrences of gimbal lock, phase angle discontinuity and incoherency in the time course of the three angles defining humerothoracic rotation were examined for each rotation sequence...
February 28, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28632049/kinematic-comparison-of-the-seoi-nage-judo-technique-between-elite-and-college-athletes
#4
Takanori Ishii, Michiyoshi Ae, Yuta Suzuki, Yasuto Kobayashi
This study sought to identify biomechanical factors that determine fast and skilful execution of the seoi-nage (shoulder throw) technique by comparing kinematics between elite and college judo athletes. Three-dimensional motion data were captured using a VICON-MX system with 18 cameras operating at 250 Hz as three male elite and seven male college judo athletes performed seoi-nage. No significant difference was found in motion phase time of the turning phase between the two groups, indicating that motion phase time is not necessarily a factor contributing quickness in seoi-nage...
February 24, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28619447/similar-movements-are-associated-with-drastically-different-muscle-contraction-velocities
#5
Daniel A Hagen, Francisco J Valero-Cuevas
We investigated how kinematic redundancy interacts with the neurophysiological control mechanisms required for smooth and accurate, rapid limb movements. Biomechanically speaking, tendon excursions are over-determined because the rotation of few joints determines the lengths and velocities of many muscles. But how different are the muscle velocity profiles induced by various, equally valid hand trajectories? We used an 18-muscle sagittal-plane arm model to calculate 100,000 feasible shoulder, elbow, and wrist joint rotations that produced valid basketball free throws with different hand trajectories, but identical initial and final hand positions and velocities...
May 31, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28614274/corrective-osteotomy-for-symptomatic-clavicle-malunion-using-patient-specific-osteotomy-and-reduction-guides
#6
Mathias Haefeli, Matthias Schenkel, Ralf Schumacher, Karim Eid
Midshaft clavicular fractures are often treated nonoperatively with good reported clinical outcome in a majority of patients. However, malunion with shortening of the affected clavicle is not uncommon. Shortening of the clavicle has been shown to affect shoulder strength and kinematics with alteration of scapular position. Whereas the exact clinical impact of these factors is unknown, the deformity may lead to cosmetic and functional impairment as for example pain with weight-bearing on the shoulder girdle...
June 13, 2017: Techniques in Hand & Upper Extremity Surgery
https://www.readbyqxmd.com/read/28611573/simultaneous-and-continuous-estimation-of-shoulder-and-elbow-kinematics-from-surface-emg-signals
#7
Qin Zhang, Runfeng Liu, Wenbin Chen, Caihua Xiong
In this paper, we present a simultaneous and continuous kinematics estimation method for multiple DoFs across shoulder and elbow joint. Although simultaneous and continuous kinematics estimation from surface electromyography (EMG) is a feasible way to achieve natural and intuitive human-machine interaction, few works investigated multi-DoF estimation across the significant joints of upper limb, shoulder and elbow joints. This paper evaluates the feasibility to estimate 4-DoF kinematics at shoulder and elbow during coordinated arm movements...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28606637/three-dimensional-shoulder-motion-after-teres-major-or-latissimus-dorsi-tendon-transfer-for-posterosuperior-rotator-cuff-tears
#8
Jan Ferdinand Henseler, Arjen Kolk, Bob Zondag, Jochem Nagels, Jurriaan H de Groot, Rob G H H Nelissen
BACKGROUND: Teres major (TM) transfer and latissimus dorsi (LD) transfer are essential treatment options in patients with posterosuperior rotator cuff (RC) tears. The purpose of this study was to quantify shoulder kinematics before and after TM transfer and LD transfer in posterosuperior RC tear patients. METHODS: In this prospective cohort study, we quantitatively measured shoulder movements using an electromagnetic tracking device (Flock of Birds) preoperatively and 1 year after either TM (n = 13) or LD (n = 9) tendon transfer...
June 9, 2017: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/28605288/neck-and-scapula-focused-exercise-training-on-patients-with-non-specific-neck-pain-a-randomized-controlled-trial
#9
Taha Ibrahim Yildiz, Elif Turgut, Irem Duzgun
OBJECTIVES: The purpose of this study was to investigate the effects of additional 6-week scapular stabilization training in patients with non-specific neck pain (NNP). MATERIALS AND METHOD: Thirty patients with non-specific neck pain were randomly allocated to the study. Fifteen participants in the intervention group (IG) received neck-focused exercise and scapular stabilization training while 15 participants in the control group(CG) received neck-focused exercise training...
June 12, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28605231/a-comparison-of-both-motorized-and-non-motorized-treadmill-gait-kinematics-to-overground-locomotion
#10
Adam M Fullenkamp, Danilo V Tolusso, C Matthew Laurent, Brian M Campbell, Andrea E Cripps
CONTEXT: Motorized treadmills (MT) present an altered motor task compared to overground (OG) locomotion in that MT belt surfaces are motor-driven, whereas individuals walking/running OG must propel themselves. A possible solution may lie with novel non-motorized treadmill (NMT) devices as the belt surface is propelled by the user. OBJECTIVE: The purpose of this study was to compare gait performance during both MT and NMT locomotion to OG. DESIGN: Crossover study...
June 12, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28599015/torso-and-bowing-arm-three-dimensional-joint-kinematics-of-elite-cellists-clinical-and-pedagogical-implications-for-practice
#11
Luke Hopper, Cliffton Chan, Suzanne Wijsman, Timothy Ackland, Peter Visentin, Jacqueline Alderson
BACKGROUND: Elite cello playing requires complex and refined motor control. Cellists are prone to right shoulder and thoracolumbar injuries. Research informing injury management of cellists and cello pedagogy is limited. The aims of this study were to quantify the torso, right shoulder, and elbow joint movement used by elite cellists while performing a fundamental playing task, a C major scale, under two volume conditions. METHODS: An eight degrees of freedom upper limb biomechanical model was applied to 3D motion capture data of the torso, upper arm, and forearm for 31 cellists with a mean experience of 19...
June 2017: Medical Problems of Performing Artists
https://www.readbyqxmd.com/read/28595162/rotator-cuff-tendinopathy-alters-the-muscle-activity-onset-and-kinematics-of-scapula
#12
Hio Teng Leong, Gabriel Yin-Fat Ng, Shing Chung Chan, Siu Ngor Fu
Athletes with rotator cuff (RC) tendinopathy demonstrate an aberrant pattern of scapular motion which might relate to deficits in the scapular muscles. This study aimed to determine whether alteration in scapular kinematics is associated with deficits in the activity onset of scapular muscles. Forty-three male volleyball players (17 asymptomatic and 26 with RC tendinopathy) joined the study. Three-dimensional scapular kinematics was quantified using an acromial marker cluster method. The activity onset of the upper (UT), middle (MT), and lower trapezius (LT), and serratus anterior (SA) during arm abduction was assessed with electromyography...
May 30, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28593086/kinematic-and-kinetic-variables-differ-between-kettlebell-swing-styles
#13
Garrett S Bullock, Abigail C Schmitt, Jason M Shutt, Gray Cook, Robert J Butler
BACKGROUND: Kettlebell (KB) and indian club swings (ICS) are used diversely for developing strength and power. It has been proposed that multiple swing techniques can be used interchangeably to elicit similar adaptations within performance training. Hypothesis/Purpose: It was hypothesized that there will be not be a difference in peak joint angles between types of swings. Furthermore, given the nature of the overhead kettlebell swing (OKS), it was hypothesized that the OKS will be associated with a greater cycle time and a greater vertical impulse compared to shoulder height swing (SKS) and ICS...
June 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28553562/the-association-of-glaucomatous-visual-field-loss-and-balance
#14
Regina A de Luna, Aleksandra Mihailovic, Angeline M Nguyen, David S Friedman, Laura N Gitlin, Pradeep Y Ramulu
PURPOSE: To relate balance measures to visual field (VF) damage from glaucoma. METHODS: The OPAL kinematic system measured balance, as root mean square (RMS) sway, on 236 patients with suspect/diagnosed glaucoma. Balance was measured with feet shoulder width apart while standing on a firm/foam surface with eyes opened/closed (Instrumental Clinical Test of Sensory Integration and Balance [ICTSIB] conditions), and eyes open on a firm surface under feet together, semi-tandem, or tandem positions (standing balance conditions)...
May 2017: Translational Vision Science & Technology
https://www.readbyqxmd.com/read/28551465/spinal-fusion-limits-upper-body-range-of-motion-during-gait-without-inducing-compensatory-mechanisms-in-adolescent-idiopathic-scoliosis-patients
#15
R M Holewijn, I Kingma, M de Kleuver, J J P Schimmel, N L W Keijsers
INTRODUCTION: Previous studies show a limited alteration of gait at normal walking speed after spinal fusion surgery for adolescent idiopathic scoliosis (AIS), despite the presumed essential role of spinal mobility during gait. This study analyses how spinal fusion affects gait at more challenging walking speeds. More specifically, we investigated whether thoracic-pelvic rotations are reduced to a larger extent at higher gait speeds and whether compensatory mechanisms above and below the stiffened spine are present...
May 17, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28542374/targeted-box-and-blocks-test-normative-data-and-comparison-to-standard-tests
#16
Kimberly Kontson, Ian Marcus, Barbara Myklebust, Eugene Civillico
BACKGROUND: The Box and Block Test (BBT) is a functional outcome measure that is commonly used across multiple clinical populations due to its benefits of ease and speed of implementation; reliable, objective measurement; and repetition of motion. In this study, we introduce a novel outcome measure called the targeted BBT that allows for the study of initiation, grasping, and transport of objects, and also of object release. These modifications to the existing test may increase the ecological validity of the measure while still retaining the previously stated benefits of the standard BBT...
2017: PloS One
https://www.readbyqxmd.com/read/28539911/the-use-of-functional-electrical-stimulation-on-the-upper-limb-and-interscapular-muscles-of-patients-with-stroke-for-the-improvement-of-reaching-movements-a-feasibility-study
#17
Alicia Cuesta-Gómez, Francisco Molina-Rueda, Maria Carratala-Tejada, Eukene Imatz-Ojanguren, Diego Torricelli, Juan Carlos Miangolarra-Page
INTRODUCTION: Reaching movements in stroke patients are characterized by decreased amplitudes at the shoulder and elbow joints and greater displacements of the trunk, compared to healthy subjects. The importance of an appropriate and specific contraction of the interscapular and upper limb (UL) muscles is crucial to achieving proper reaching movements. Functional electrical stimulation (FES) is used to activate the paretic muscles using short-duration electrical pulses. OBJECTIVE: To evaluate whether the application of FES in the UL and interscapular muscles of stroke patients with motor impairments of the UL modifies patients' reaching patterns, measured using instrumental movement analysis systems...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28532884/the-role-of-scapular-kinematics-in-patients-with-different-shoulder-musculoskeletal-disorders-a-systematic-review-approach
#18
REVIEW
Roshanak Keshavarz, Siamak Bashardoust Tajali, Seyed Mohsen Mir, H Ashrafi
This study aimed to identify the role of the scapula in shoulder musculoskeletal disorders (SMDs) and provided a systematic review of available studies in the field of scapular three-dimensional kinematics. We systematically searched 5 international databases, including Scopus, EMBASE, PubMed, CINAHL, PEDro, and Cochrane Library from June to September 2015. Twenty studies met the inclusion criteria and were retrieved in full paper. The selected studies were critically appraised independently by two researchers...
April 2017: Journal of Bodywork and Movement Therapies
https://www.readbyqxmd.com/read/28528016/the-influence-of-humeral-neck-shaft-angle-and-glenoid-lateralization-on-range-of-motion-in-reverse-shoulder-arthroplasty
#19
Birgit S Werner, Jean Chaoui, Gilles Walch
BACKGROUND: Recent developments in reverse shoulder arthroplasty (RSA) have focused on changes in several design-related parameters, including humeral component design, to allow for easier convertibility. Alterations in humeral inclination and offset on shoulder kinematics may have a relevant influence on postoperative outcome. This study used a virtual computer simulation to evaluate the influence of humeral neck shaft angle and glenoid lateralization on range of motion in onlay design RSA...
May 17, 2017: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/28523425/characterization-of-electrocorticogram-high-gamma-signal-in-response-to-varying-upper-extremity-movement-velocity
#20
Po T Wang, Colin M McCrimmon, Christine E King, Susan J Shaw, David E Millett, Hui Gong, Luis A Chui, Charles Y Liu, Zoran Nenadic, An H Do
The mechanism by which the human primary motor cortex (M1) encodes upper extremity movement kinematics is not fully understood. For example, human electrocorticogram (ECoG) signals have been shown to modulate with upper extremity movements; however, this relationship has not been explicitly characterized. To address this issue, we recorded high-density ECoG signals from patients undergoing epilepsy surgery evaluation as they performed elementary upper extremity movements while systematically varying movement speed and duration...
May 18, 2017: Brain Structure & Function
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