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Results 201 - 250 of 1150
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Dokka Kalpana - - 2009
We investigated how the velocity of anterior-posterior movement of a visual surround affected segmental kinematics during stance. Ten healthy young adults were exposed to sinusoidal oscillation of an immersive virtual scene at five peak velocities ranging from 1.2 to 188 cm/s at each of four frequencies: 0.05, 0.1, 0.2 and ...
Küng U M - - 2009
Positive effects on lateral center of mass (CoM) shifts during balance recovery have been seen with voluntarily unilateral arm raising but not with voluntarily bilateral knee flexion. To determine whether unilateral voluntary knee movements can be effectively incorporated into balance corrections we perturbed the balance of 30 young healthy subjects ...
Kozanek Michal M Department of Orthopaedic Surgery, Bioengineering Laboratory, Massachusetts General Hospital and Harvard Medical School, GRJ 1215, Boston, MA 02114, - - 2009
Accurate knowledge of the dynamic knee motion in-vivo is instrumental for understanding normal and pathological function of the knee joint. However, interpreting motion of the knee joint during gait in other than the sagittal plane remains controversial. In this study, we utilized the dual fluoroscopic imaging technique to investigate the ...
Chan Jacky J City University of Hong Kong, Kowloon, Hong Kong. - - 2010
In this paper, an objective assessment for determining whether a person has Parkinson disease is proposed. This is achieved by analyzing the correlation between joint movements, since Parkinsonian patients often have trouble coordinating different joints in a movement. Thus, the auto-correlation coefficient of single joint movements and the cross-correlation between ...
Lemaire Edward D - - 2009
Currently, stance-control knee orthoses require external control mechanisms to control knee flexion during stance and allow free knee motion during the swing phase of gait. A new angular-velocity control approach that uses a rotary-hydraulic device to resist knee flexion when the knee angular velocity passes a preset threshold is presented. ...
Schaller Nina U - - 2009
The ostrich (Struthio camelus) is the largest extant biped. Being flightless, it exhibits advanced cursorial abilities primarily evident in its characteristic speed and endurance. In addition to the active musculoskeletal complex, its powerful pelvic limbs incorporate passive structures wherein ligaments interact with joint surfaces, cartilage and other connective tissue in ...
Shultz Sandra J SJ Department of Exercise and Sport Science, University of North Carolina at Greensboro, 1408 Walker Avenue, Greensboro, North Carolina 27402, USA. - - 2009
Knee ligament injuries frequently happen when the joint transitions from non-weight bearing (NWB) to weight bearing (WB). To gain insight into the mechanism that produces these injuries, physically active females (N = 41) and males (N = 39) underwent measurement of coupled tibiofemoral joint displacements [anterior tibial translation (ATT) and ...
Cheze L - - 2009
The International Society of Biomechanics (ISB) has recommended a standardisation for the motion reporting of almost all human joints. This study proposes an adaptation for the trapeziometacarpal joint. The definition of the segment coordinate system of both trapezium and first metacarpal is based on functional anatomy. The definition of the ...
Merican Azhar M - - 2009
The iliotibial band (ITB) has an important role in knee mechanics and tightness can cause patellofemoral maltracking. This study investigated the effects of increasing ITB tension on knee kinematics. Nine fresh-frozen cadaveric knees had the components of the quadriceps loaded with 175 N. A Polaris optical tracking system was used ...
Osti Leonardo - - 2009
The kneeling view is a method to objectively measure posterior knee laxity. However, the actual amount of load applied and the reliability of this method in term of side to side difference are not known. We studies these issues in a group a 25 healthy volunteers who underwent measurements of ...
Sheets Alison L - - 2009
Forward dynamics simulations of a dismount preparation swing on the uneven parallel bars were optimized to investigate the sensitivity of dismount revolution potential to the maximum bar force before slipping, and to low-bar avoidance. All optimization constraints were classified as 1-anatomical/physiological; limiting maximum hand force on the high bar before ...
Aalbersberg Sietske - - 2009
It has been reported that anterior cruciate ligament (ACL)-deficient subjects increase the level of hamstrings activation and this has been interpreted as a means to cope with increased anterior tibial laxity in the knee. This study aimed to establish to what extent co-activation strategies in ACL-deficient subjects are load level ...
Cordova Mitchell L - - 2010
Cryotherapy and ankle bracing are often used in conjunction as a treatment for ankle injury. No studies have evaluated the combined effect of these treatments on reflex responses during inversion perturbation. This study examined the combined influence of ankle bracing and joint cooling on peroneus longus (PL) muscle response during ...
Young Jesse W - - 2009
Juvenile animals must often compete against adults for common resources, keep pace during group travel and evade common predators, despite reduced body size and an immature musculoskeletal system. Previous morphometric studies of a diverse array of mammals, including jack rabbits, cats and capuchin monkeys, have identified growth-related changes in anatomy, ...
Park Jung Ho - - 2009
While the lower extremities support the weight and move the body, the upper extremities are essential for the activities of daily living, which require many detailed movements. Therefore, a disability of the upper extremity function should include a limitation of all motions of the joints and sensory loss, which affects ...
Silva Paula L - - 2009
Individuals commonly adjust joint stiffness in response to changes in environmental and task demands. The objective of the present study was to evaluate the contribution of muscular cocontraction and eccentric activity to this adjustment. In all, 30 healthy volunteers participated in the present study. The authors indirectly manipulated elbow stiffness ...
Goto Akira A Osaka university, Orthopaedic Surgery, 2-2 Yamadaoka, Suita 565-0871, Japan. - - 2009
It is difficult to determine the kinematics of the subtalar joint because of its anatomical and functional complexity. The purpose of the study was to clarify the 3D kinematics of the subtalar joint in vivo. Subjects were four healthy female volunteers. Magnetic resonance imaging (MRI) sequences were acquired in seven ...
Chino Kentaro - - 2009
To investigate the relationship between fascicle behavior and joint torque, the fascicle behavior of the triceps surae during isometric and eccentric (30 and 60 deg/s) plantar flexion by maximal voluntary and submaximal electrical activation (MVA and SEA) was measured by realtime ultrasonography. Eccentric torque at 30 and 60 deg/s was ...
Rose Natasha S - - 2009
The aim of this study was to quantify the effects of two different 8-week stretching regimes on stride length (SL) and range of motion (ROM) in the equine trot. Eighteen horses were divided into three matched groups: a 6 days/week stretching regime (6DSR), a 3 days/week stretching regime (3DSR) and ...
Elipot M - - 2009
The purpose of this study was to determine the swimmers' loss of speed during the underwater gliding motion of a grab start. This study also set out to determine the kinematical variables influencing this loss of speed. Eight French national-level swimmers participated in this study. The swimmers were filmed using ...
Brown Kathryn M - - 2009
This study investigated whether points digitized for the purpose of embedding coordinate systems into the foot accurately represented the orientation of the bone described. Eight complete data sets were collected from 9 adult cadaver specimens. Palpable landmarks defined 5 segments to include the calcaneus, navicular, medial cuneiform, first metatarsal, and ...
Tuijthof Gabriëlle Josephine Maria - - 2009
BACKGROUND: Measuring the range of motion of the ankle joint can assist in accurate diagnosis of ankle laxity. A computed tomography-based stress-test (3D CT stress-test) was used that determines the three-dimensional position and orientation of tibial, calcaneal and talar bones. The goal was to establish a quantitative database of the ...
Braz G P - - 2009
Standing by means of functional electrical stimulation (FES) after spinal cord injury is a topic widely reported in the neurorehabilitation literature. This practice commonly uses surface stimulation over the quadriceps muscle to evoke knee extension. To date, most FES neuroprostheses still operate without any artificial feedback, meaning that after a ...
Nordez A - - 2010
The findings of previous research indicate that the passive torque-angle curve may be different according to whether individuals have undertaken cyclic or static stretching. To date, no authors have compared these curves in the same subjects. We hypothesised that static stretching would lead to a constant change in range of ...
Gordon J Eric - - 2009
BACKGROUND: The lateral distal femoral angle (LDFA), the medial proximal tibial angle (MPTA), and the mechanical axis deviation (MAD) are commonly used in the evaluation of lower extremity deformities. The interobserver and intraobserver reliabilities of these measurements have not been evaluated. METHODS: Three groups of observers with different levels of ...
Yaikwawongs Nammond - - 2009
OBJECTIVE: To compare the reliability of range of motion measurement in the knee joint using a digital compass goniometer combined with inclinometer with standard range of motion measurement from roentgenographic picture. MATERIAL AND METHOD: Range of flexion and extension of the knee joint in volunteer participants was measured by the ...
Brindle T J - - 2010
The purpose of this study was to determine if gastrocnemius elongation or shortening and direction and velocity of knee movement influenced knee kinesthesia. Healthy volunteers sat with their knee flexed (20 degrees) and was then passively rotated (flexion or extension) at three velocities (0.5, 2, or 10 degrees/s) while the ...
Zeni Joseph A JA Jr Department of Physical Therapy, University of Delaware, 301 McKinly Laboratory, Newark, DE 19716, USA. - - 2009
While knee osteoarthritis has been shown to affect a multitude of kinematic, kinetic and temporo-spatial gait parameters, few investigations have examined the effect of increasing levels of radiographic osteoarthritis severity on these gait parameters. Fewer still have investigated the effect of walking speed on gait variables in persons with knee ...
Fradet Laetitia L Department of Kinesiology, Arizona State University, PO Box 870404, Tempe, AZ 85287-0404, - - 2009
The leading joint hypothesis (LJH) suggests distinct types of control (leading and subordinate) at different joints during multi-joint movements. Taking into account specific features of movements in Parkinson's disease (PD), the LJH predicts distinct effect of PD on control of leading and subordinate joints: impaired interaction torque (INT) regulation should ...
Haussler K K - - 2009
REASONS FOR PERFORMING STUDY: Sacroiliac joint injuries can cause poor performance; however, the interaction between pelvic mechanics and the sacroiliac joint is poorly understood. OBJECTIVE: To measure pelvic displacement during 3D sacroiliac joint loading. METHODS: Nine reflective triads were attached rigidly to bony prominences in sacropelvic specimens harvested from 14 ...
Sealey Randolph J RJ Mercy Medical Center, Institute for Foot and Ankle Reconstruction, 301 St. Paul Place, Baltimore, MD 21202, USA. - - 2009
The progression of subtalar and midfoot arthritis is well documented following ankle arthrodesis, and gait analysis has suggested that a functional gait pattern following arthrodesis may be due to tarsal hypermobility compensating for lost tibiotalar motion. We present a prospective radiographic study comparing the pre- and postoperative range of motion ...
Colborne G R - - 2009
REASONS FOR PERFORMING STUDY: Joint congruity and ligaments restrain the distal limb joints from excessive motion in the transverse and frontal planes, but the magnitudes and direction of the horizontal twisting moments around the hoof's centre of pressure (CoP) that induce these motions are unknown. OBJECTIVES: To quantify the horizontal ...
Johnson J L - - 2009
REASONS FOR PERFORMING STUDY: Research into kinematics of the healthy equine back, has been performed in the walk and trot. This study focuses on back kinematics during canter, over a range of velocities. Flexion extension (FE) movements in canter are greatest in the lumbosacral (LS) region. Previous research has focused ...
Hutchins S - - 2009
BACKGROUND: Rocker profiles are the most commonly prescribed external therapeutic shoe modification. However, the prescription criteria for rocker profiles have historically been based on theoretical considerations with minimal scientific study and validation. OBJECTIVE: Rocker profiles are used to afford pressure relief for the plantar surface of the foot, to limit ...
Yeow C H - - 2009
Ground reaction forces (GRF), knee flexion angles, angular velocities and joint powers are unknown at large landing heights, which are infeasible for laboratory testing. However, this information is important for understanding lower extremity injury mechanisms. We sought to determine regression relationships of landing height with these parameters during landing so ...
Bible Jesse E - - 2009
Investigations of the usefulness of continuous passive motion (CPM) after TKA have yielded mixed results, with evidence suggesting its efficacy is contingent on the presence of larger motion arcs. Surprisingly, the range of motion (ROM) the knee actually experiences while in a CPM machine has not been elucidated. In this ...
de Rugy Aymar - - 2009
Reaching to visual targets engages the nervous system in a series of transformations between sensory information and motor commands. That which remains to be determined is the extent to which the processes that mediate sensorimotor adaptation to novel environments engage neural circuits that represent the required movement in joint-based or ...
Williams S B - - 2009
Animals in their natural environments are confronted with a regular need to perform rapid accelerations (for example when escaping from predators or chasing prey). Such acceleration requires net positive mechanical work to be performed on the centre of mass by skeletal muscle. Here we determined how pelvic limb joints contribute ...
Harris-Hayes Marcie M Program in Physical Therapy, Washington University School of Medicine, St Louis, MO 63108, - - 2009
Hip function has been proposed to be related to low back pain (LBP) because of the anatomical proximity of the hip and lumbopelvic region. To date, findings have been inconclusive, possibly because the samples studied were heterogeneous. Sub-grouping samples based on characteristics such as activity demand, LBP classification, and sex ...
Valentini R - - 2009
The use of orthotic heel lifts is proposed in many cases of Achilles tendon disorders as a first-line or conservative treatment. The use of heeled shoes induces a plantar flexion of the ankle joint with a consequent decrease in the tension forces acting onto the triceps surae. The question to ...
Fleet K - - 2009
BACKGROUND AND PURPOSE: Taping has been used for the prevention and treatment of ankle injuries. The change in tape strength has not been specifically quantified during activities of daily living (ADL) by any investigation so far. Therefore the primary aim of this study was to investigate the change in ankle ...
Wann A K T - - 2009
Joint movement was recently shown to stimulate the secretion of the lubricant hyaluronan (HA); also, exercise therapy and intra-articular hyaluronan injections are used to treat moderate osteoarthritis. The present study quantifies the stimulus-response curves for HA secretion in vivo and reports a role of transcription-translation-translocation in the secretory response. After ...
Darcy Shon P - - 2009
Mechanical devices, such as robotic manipulators have been designed to measure joint and ligament function because of their ability to position a diarthrodial joint in six degrees-of-freedom with fidelity. However, the precision and performance of these testing devices vary. Therefore, the objective of this study was to determine the effect ...
Lindinger Stefan Josef - - 2009
PURPOSE: Double poling (DP) as a main technique in cross-country skiing has developed substantially over the last 15 yr. The purpose of the present study was to analyze the question, "How do modern elite skiers control DP speed?" METHODS: Twelve male elite cross-country skiers roller skied using DP at 9, ...
Wang Ju J State Key Laboratory of Virtual Reality Technology and Systems, Robotics Institute, Beihang University, Beijing, China. - - 2009
This paper presents a new exoskeleton with 4 degrees of freedom (DOF) for index finger rehabilitation. The device can generate bi-directional movement for all joints of the finger through cable transmission, which is required for passive and active trainings. With two prismatic kinematic joints in the design, it can accommodate ...
Yoshioka Shinsuke - - 2009
Slowness of movement is a factor that may cause a decrease of quality of daily life. Mobility in the elderly and people with movement impairments may be improved by increasing the quickness of fundamental locomotor tasks. Because it has not been revealed how much muscle strength is required to improve ...
Yen Jasper T JT Biomedical Engineering Program, Emory University/Georgia Institute of Technology, Atlanta, GA 30332 - - 2009
Normal human locomotion requires the ability to control a complex, redundant neuromechanical system to repetitively cycle the legs in a stable manner. In a reduced paradigm of locomotion, hopping, we investigated the ability of human subjects to exploit motor redundancy in the legs to coordinate joint torques fluctuations to minimize ...
Nordez A - - 2009
BACKGROUND: The mechanisms behind changes in mechanical parameters following stretching are not understood clearly. This study assessed the effects of joint angular velocity on the immediate changes in passive musculo-articular properties induced by cyclic stretching allowing an appreciation of viscosity and friction, and their contribution to changes in torque that ...
Fong Daniel Tik-Pui - - 2008
This study investigated the lower extremity preventive measures for slips on simulated slippery surfaces in construction worksites. A total of 15 harnessed Chinese males walked without slips on a 5-m walkway in 16 simulated conditions 10 times at their natural cadence. Joint moments were calculated from kinetics, kinematics and anthropometric ...
Williams D S Blaise - - 2008
STUDY DESIGN: Retrospective cohort study. OBJECTIVES: To determine if runners with a history of Achilles tendonopathy (AT) demonstrate a difference in transverse-plane motion and moments at the distal tibia and knee compared to runners without a history of AT. BACKGROUND: One of the more prevalent overuse running injuries is AT. ...
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