Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 27 for “"co-contraction"”.
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Characteristics of muscle co-contraction during isometric tracking
… was to study the relationship between muscle coordination and the performance of a simple manual tracking task. The study employed an isometric, zero order, pursuit tracking task with a laterally translating, periodic sine wave forcing function. The speed of the target was varied by altering …
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Improving prosthetic control : an analysis of EMG-based haptic feedback’s role in reducing muscle co-contraction
… vöðvasamdrætti og draga úr vöðva sampspennu (co-contraction). Niðurstöðurnar sýndu að titrings-snerti svörunarkerfi var skilvirkt og hjálpaði notendum við að greina vöðvasamdrætti sína á áhrifaríkan hátt. Athyglisvert er að endurgjöfin leiddi til minnkunar á vöðva samspennu í þremur af fjórum …
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The effects of perturbation frequency, magnitude, and uncertainty during static and dynamic tracking on the estimated level of muscle co-contraction
… sudden momentary changes in the gain. In the second experiment, perturbations to the tracking consisted of momentary changes in the resistance of the lever arm used to track the icons. In the first experiment with isometric tracking the effects of perturbation frequency, perturbation magnitude, …
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Low Back Biomechanical Analysis of Isometric Pushing and Pulling Tasks
… the neuromuscular recruitment and stabilizing control of the spine during pushing and pulling exertions. Past theoretical investigation suggest that co-contraction of the of the paraspinal muscles is necessary to stabilize the spine during pushing exertions. We hypothesized greater levels of …
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Linear System Analyses of the Role of Reflex Gain and Delay in a Dynamic Human Spine Model
… studies by modeling the neuromuscular dynamic control of the spine. The presence of delay in the reflexive system limits the availability of traditional stability analyses. However it is possible to investigate how reflex delay affects stability of the spine model using methods in linear time …
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Investigating Forearm Muscle Activity Across Violin String Heights
… forearm and upper trapezius muscle activity and co-contraction indices during performance of a four-octave G-major scale on two identical violins with a low and a high string height. Surface electromyography was collected from six forearm muscles and bilaterally from the upper trapezius. While …
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The influence of trunk inclination on lower limb moments and muscle activation patterns
… knee muscle activity and increased muscular co-contraction. Modelling studies suggest that such altered muscle patterns may increase the loading on knee joint, with imaging studies suggesting that co-contraction may accelerate cartilage loss. Interestingly, there is now emerging evidence that …
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Towards improved efficacy of exercise programmes in knee osteoarthritis
Knee osteoarthritis (OA) is a common musculoskeletal condition influenced by theload on the knee (i.e. External Knee Adduction Moment (EKAM)). Clinicalguidelines recommend exercise and education with knee OA. Open kinetic chainstrengthening exercises of the knee and/or hip muscles did not change …
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Shock attenuation at the knee during walking in people with knee osteoarthritis: association with disease severity and effects of exercise
… of individuals. METHODS: 295 individuals with confirmed knee osteoarthritis were recruited from surrounding communities in this study. Of these 295 participants, 58 participants were included in a 12-week follow-up study to compare the effects of exercise therapy. All muscle activation and …
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An Electromyographical Analysis of Shoulder and Trunk Muscles During Chest Press on Stable and Unstable Platforms
… surfaces during resistance training has become increasingly popular. The majority of research examining the effect of replacing a bench with a stability ball during the supine chest press has found that force output capability is compromised without a subsequent decrease in agonist muscle …
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The Age-Related Effects of Visual Input on Multi-Sensory Weighting Process During Locomotion and Unexpected Slip Perturbations
… a major role in stabilizing posture, guiding locomotion and controlling slip response. However, previous studies have focused on the age-related effects of visual input on static postural stability. The age-related effects of visual input associated with locomotion and unexpected slip …
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Clinical and Biomechanical Effects of the Traditional Chinese Medical Treatments in Individuals with Medial Knee Osteoarthritis
Background: Knee otesoarthritis (OA) is the most common of the arthritises, affecting an estimated over 300 million people worldwide. Traditional Chinese Medicine (TCM) therapies have been widely used in the management of knee OA in China, however, there has been a lack of studies evaluated the …
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Sensorimotor learning under switching dynamics
… motor memories without interference. Here we combine behavioural experiments and computational modelling to investigate how the sensorimotor system uses contextual information to create, update and recall motor memories. We first examine the role of muscle co-contraction in the learning of …
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Investigation of Rapid Visual Feedback Processing
… are generally more prevalent under predictable conditions, such as when there are visual cues on where the stimulus will occur, but little else is known about the behavioral contexts that influence these rapid motor responses. To investigate this, we employed a fast-feedback interception task …
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Quantification and Evaluation of the Biomechanical Behaviour of the Trunk During Fundamental Tasks: Should the Thoracic Spine be Considered?
… function in relation to the lumbar spine. Lumbar co-contraction was quantified during thoracic movements in Study #5. Thirty participants performed upright standing, maximum trunk ROM, and thoracic ROM. Thoracic flexion, bending, and twisting elicited 67%, 45%, and 55% greater co-contraction in …
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The biomechanical effect of trunk inclination on joint moments and muscle activation in people with knee osteoarthritis
… increased muscle activity and increased muscular co-contraction. Furthermore, modelling studies have shown that the alterations in muscle patterns that are characteristic of knee OA lead to elevated joint loads, while longitudinal studies have demonstrated the progression of knee OA to be related …
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A biomechanical investigation of the structure--function relationships in the human tongue
… tongue is a versatile, lithe and structurally complex muscular organ that is of paramount importance for many physiological tasks. The lingual musculature is composed of various orthogonally oriented myofiber populations. Furthermore, coupling this knowledge of tissue myoarchitecture with …
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Effectiveness of single and combined treatments on biomechanical and clinical outcomes during walking in healthy individuals and individuals with knee osteoarthritis
Knee osteoarthritis (OA) is considered a common chronic musculoskeletal disease affecting the medial compartment more than the lateral compartment and leading to disability and a reduction in activity level. Lateral wedge insoles (LWI) are a conservative treatment that aims to reduce the knee …
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Investigação do início de ativação de músculos do tronco durante realização de tarefa motora em homens com e sem dor lombar.
… without LBP, and used isokinetic equipment to control speed and angle of movement. When comparing muscle activation times between groups, the results were statistically significant for the upper rectus abdominis, lower rectus abdominis and external oblique muscles at speeds of 120°/s and 90°/s; …
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Rib stress fractures in elite rowers
… ergometer rowing in rowers with previous RSF and controls. The RSF subjects displayed reduced lumbar spine BMD, increased co-contraction of thoracic muscles and increased elbow-flexion strength relative to knee-extension strength. Testosterone levels and BMD were measured in male lightweight …
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