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eccentric rotation

Cherie Walker, Peter Sinclair, Kenneth Graham, Stephen Cobley
Inertial Measurement Units (IMUs) may offer an ecologically valid, reliable, and practical method for biomechanical performance analysis. With such potential in mind, Part 1 of this study examined the accuracy of IMUs gyroscopes with an optical system (Cortex 3.3). A calibration formula standardised the IMUs angular velocity output with the optical system. The percentage differences between the two measures = 0.5% (p < 0.05), suggest IMU's efficacy for application. In Part 2, the aim was to examine and understand how dive flight angular velocity time series plots change and increase according to dive degree of difficulty...
October 20, 2016: Sports Biomechanics
Sean McIntire, Lee Boujie, John Leasiolagi
Injuries involving rupture of the pectoralis major are relatively rare. When they do occur, it is mostly frequently in a young, athletic man. The most common cause is weight lifting that results in eccentric muscle contraction (muscle contraction against an overbearing force, leading to muscle lengthening)-specifically, the bench press. Other mechanisms for this injury include forceful abduction and external rotation of the arm. Injury can occur anywhere along the pectoralis major from its medial origin on the sternum and clavicle to its lateral tendinous insertion on the humerus...
2016: Journal of Special Operations Medicine: a Peer Reviewed Journal for SOF Medical Professionals
Kei Sakamoto, Shinya Homma, Takuya Takanashi, Shinji Takemoto, Yoshitaka Furuya, Masao Yoshinari, Yasutomo Yajima
The purpose of this in vitro study was to investigate the influence of eccentric loading on implant components by measuring screw loosening and observing these components under several load positions and magnitudes. The external and internal joint system implants with butt joint connection were subjected to cyclic loading tests according to the specifications of ISO 14801. Load position was set at 0, 4, or 8 mm, and load was set at 100 or 300 N. On the external joint system, the reverse torque values decreased with distal shift in the loading position and an increase in magnitude of load, and abrasion and deformation on the anti-rotation device were observed...
October 1, 2016: Dental Materials Journal
T Amano, Y Hasegawa, T Seki, Y Takegami, K Murotani, N Ishiguro
AIMS: The influence of identifiable pre-operative factors on the outcome of eccentric rotational acetabular osteotomy (ERAO) is unknown. We aimed to determine the factors that might influence the outcome, in order to develop a scoring system for predicting the prognosis for patients undergoing this procedure. PATIENTS AND METHODS: We reviewed 700 consecutive ERAOs in 54 men and 646 women with symptomatic acetabular dysplasia or early onset osteoarthritis (OA) of the hip, which were undertaken between September 1989 and March 2013...
October 2016: Bone & Joint Journal
Wieske van Zoest, Benedetta Heimler, Francesco Pavani
The aim of the present study was to investigate the impact of dynamic distractors on the time-course of oculomotor selection using saccade trajectory deviations. Participants were instructed to make a speeded eye movement (pro-saccade) to a target presented above or below the fixation point while an irrelevant distractor was presented. Four types of distractors were varied within participants: (1) static, (2) flicker, (3) rotating apparent motion and (4) continuous motion. The eccentricity of the distractor was varied between participants...
September 28, 2016: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
Ludovic Humetz
OBJECTIVE: The isokinetic exploration of the shoulder seems little standardized, particularly at the time of the choice of the studied muscular groups, of the installation of the subject as well as positioning of the articulation itself. OBSERVATIONS: Rehabilitation treatment of a 17 year old patient, hyperlaxe, swimmer, in the context of a painful chronic former instability of the shoulder without osseous, muscular lesion or labrale. An isokinetic work of reinforcement of the internal rotators is carried out, into concentric of 60°/s to 240°/s, position known as of Davies modified then in decubitus dorsal of 45° to 90° of abduction...
September 2016: Annals of Physical and Rehabilitation Medicine
William Howard, Jonathan Burgess, Borut Vrhovnik, Christian Stringer, Sherrie T Choy, Jonathan F Marsden, Ingrid A Gedikoglou, Gary L Shum
OBJECTIVES: To determine the differences in the dynamic control ratio of the glenohumeral joint rotators, during internal rotation at 20° and 60° of humeral elevation in the scapular plan. Dynamic control ratio (DCR) is defined as the ratio between eccentric action of the lateral rotators and the concentric action of the medial rotators. DESIGN: A cross-sectional laboratory study. METHODS: Thirty asymptomatic participants (men n=14, women n=16, mean age=29...
September 16, 2016: Journal of Science and Medicine in Sport
Sang Min Ko, Kwangil Lee, Daeho Kim, Yong Gu Ji
Haptic technology is used in various fields to transmit information to the user with or without visual and auditory cues. This study aimed to provide preliminary data for use in developing a haptic interface for an antigravity (anti-G) suit. With the structural characteristics of the anti-G suit in mind, we determined five areas on the body (lower back, outer thighs, inner thighs, outer calves, and inner calves) on which to install ten bar-type eccentric rotating mass (ERM) motors as vibration actuators. To determine the design factors of the haptic anti-G suit, we conducted three experiments to find the absolute threshold, moderate intensity, and subjective assessments of vibrotactile stimuli...
January 2017: Applied Ergonomics
Kathleen A Swanik, Stephen J Thomas, Aaron H Struminger, Kellie C Huxel Bliven, John D Kelly Iv, Charles B Swanik
CONTEXT: Plyometric training is credited with providing benefits in performance and dynamic restraint. However, limited prospective data exists quantifying kinematic adaptations such as amortization time, glenohumeral rotation, and scapulothoracic position, which may underlie its efficacy for upper extremity rehabilitation or performance enhancement. OBJECTIVE: To measure upper extremity kinematics and plyometric phase times before and after an 8 week upper extremity strength and plyometric training programs...
August 24, 2016: Journal of Sport Rehabilitation
M Mickevičius, S Rutkauskas, S Sipavičienė, A Skurvydas, J Jürimäe, H Degens, S Kamandulis
The aim of this study was to assess whether side-to-side differences in morphology and function of the upper limbs in 11-12 year-old male baseball players with throwing-related pain (n=14) were more pronounced than that of age-matched healthy untrained subjects (n=16). Baseball players 1) had played baseball≥4.5 h·wk(-1) for ≥ 4 years and (2) suffered from moderate-intensity (3-6 points on 10-point questionnaire scale) throwing-related pain in the shoulder or elbow in at least 2 training sessions within the past month...
August 23, 2016: International Journal of Sports Medicine
K L Holt, D P Raper, C E Boettcher, G S Waddington, M K Drew
OBJECTIVES: To investigate inter and intra-rater reliability of hand held (HHD) and externally fixed (EFD) dynamometry for shoulder internal (IR) and external rotation (ER) strength and their correlation to isokinetic testing. DESIGN: Within participant, inter and intra-rater reliability study. PARTICIPANTS: Twenty active, healthy male and female participants underwent testing by two examiners. OUTCOME MEASURES: Intra-class coefficients (ICC), percentage standard error of measurement (%SEM), and percentage minimal detectable change (%MDC) were calculated for inter-rater, intra-day and intra-rater, inter-week reliability...
September 2016: Physical Therapy in Sport
Yi Luo, Hong Duan, Jiao-ming Luo, Yong Zhou, Li Min, Wen-li Zhang, Rui Shi, Chang Zou, Chong-qi Tu
OBJECTIVE: To investigatethe clinical significance of hip rotation center location after reconstruction with modular hemipelvic prostheses for periacetabula tumors. METHODS: Forty-two patients who received periacetabular tumor resection and reconstruction with modular hemipelvic prosthesis between January 2004 and January 2014 in our institute were included. Postoperative complications, function (measured by MSTS score), survival rate and recurrence rate were analyzed...
May 2016: Sichuan da Xue Xue Bao. Yi Xue Ban, Journal of Sichuan University. Medical Science Edition
Mark King, Agnes Hau, Glen Blenkinsop
Recreational tennis players tend to have higher incidence of tennis elbow, and this has been hypothesised to be related to one-handed backhand technique and off-centre ball impacts on the racket face. This study aimed to investigate for a range of participants the effect of off-longitudinal axis and off-lateral axis ball-racket impact locations on racket and forearm joint angle changes immediately following impact in one-handed tennis backhand groundstrokes. Three-dimensional racket and wrist angular kinematic data were recorded for 14 university tennis players each performing 30 "flat" one-handed backhand groundstrokes...
July 27, 2016: Journal of Sports Sciences
Jinglei Zhao, Huayan Pu, Jun Zou, Yi Sun, Shugen Ma
A novel eccentric paddle mechanism based on the epicyclic gear mechanism (ePaddle-EGM) has been proposed to enhance the mobility of amphibious robot for multi-terrain tasks with diverse locomotion gaits. This paper presents a brief description for this mechanism. Based on the feature of ePaddle-EGM, a unique non-reciprocating legged gait planning method is proposed. This method could minimize the negative effect of backlash between gear mesh in the epicyclic gear mechanism. Furthermore, the stable tripod gait for the ePaddle-EGM-based hexapod robot is designed...
2016: Robotics and Biomimetics
Yi Sun, Yang Yang, Shugen Ma, Huayan Pu
Gaining high mobility on versatile terrains is a crucial target for designing a mobile robot toward tasks such as search and rescue, scientific exploration, and environment monitoring. Inspired by dextrous limb motion of animals, a novel form of locomotion has been established in our previous study, by proposing an eccentric paddle mechanism (ePaddle) for integrating paddling motion into a traditional wheeled mechanism. In this paper, prototypes of an ePaddle mechanism and an ePaddle-based quadruped robot are presented...
2016: Robotics and Biomimetics
Lucie Sawides, Alberto de Castro, Stephen A Burns
The cone photoreceptors represent a fundamental sampling step in the acquisition of information on our environment. While recent advances in adaptive optics have provided increasingly good estimates of the packing density and spacing of the cone photoreceptors in the living human retina, we know little about the local arrangement beyond a tendency towards hexagonal packing. We analyzed the cone mosaic in data from 10 normal subjects. We applied a technique to calculate the local average cone mosaic which allows us to determine the hexagonality, spacing and orientation of local regions...
June 25, 2016: Vision Research
Beate Dejaco, Bas Habets, Corné van Loon, Susan van Grinsven, Robert van Cingel
PURPOSE: To investigate the effectiveness of isolated eccentric versus conventional exercise therapy in patients with rotator cuff tendinopathy. METHODS: Thirty-six patients with rotator cuff tendinopathy, diagnosed by an orthopaedic surgeon, were included and randomly allocated to an isolated eccentric exercise (EE) group (n = 20, mean age = 50.2 ± 10.8 years) or a conventional exercise (CG) group (n = 16, mean age = 48.6 ± 12.3 years). Both groups fulfilled a 12-week daily home-based exercise programme and received a total amount of nine treatment sessions...
June 28, 2016: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
B Fontenier, A Hault-Dubrulle, P Drazetic, C Fontaine, H Naceur
The use of highly sensitive soft materials has become increasingly apparent in the last few years in numerous industrial fields, due to their viscous and damping nature. Unfortunately these materials remain difficult to characterize using conventional techniques, mainly because of the very low internal forces supported by these materials especially under high strain-rates of deformation. The aim of this work is to investigate the dynamic response of a polymer gel brain analog material under specific rotational-impact experiments...
October 2016: Journal of the Mechanical Behavior of Biomedical Materials
Abbey Schory, Erik Bidinger, Joshua Wolf, Leigh Murray
PURPOSE: The purpose of this systematic review was to determine the exercises that optimize muscle ratios of the periscapular musculature for scapular stability and isolated strengthening. METHODS: A systematic search was performed in PubMed, CINAHL, SPORTDiscus, Scopus, and Discovery Layer. Studies were included if they examined the muscle activation of the upper trapezius compared to the middle trapezius, lower trapezius, or serratus anterior using EMG during open chain exercises...
June 2016: International Journal of Sports Physical Therapy
Aomawa L Shields, Rory Barnes, Eric Agol, Benjamin Charnay, Cecilia Bitz, Victoria S Meadows
UNLABELLED: As lower-mass stars often host multiple rocky planets, gravitational interactions among planets can have significant effects on climate and habitability over long timescales. Here we explore a specific case, Kepler-62f (Borucki et al., 2013 ), a potentially habitable planet in a five-planet system with a K2V host star. N-body integrations reveal the stable range of initial eccentricities for Kepler-62f is 0.00 ≤ e ≤ 0.32, absent the effect of additional, undetected planets...
June 2016: Astrobiology
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