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 23 for “"muscle recruitment"”.
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Muscle Recruitment Mechanism under Optogenetic Neuromodulation
… larger motor units before smaller ones, causing muscles to fatigue quickly as it opposes the physiological recruitment mechanism. FES has low-specificity, making neighboring tissues susceptible to simultaneous activation. These drawbacks make force modulation difficult, limiting its …
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Analysis of scapulothoracic muscle recruitment in overhead athletes
Chronische schouderklachten komen frequent voor bij atleten die een bovenhandse sport beoefenen. Tijdens de bovenhandse slag-, werp-, of zwembeweging wordt de schouder immers aan extreem hoge belastingen onderworpen, die de integriteit van de capsuloligamentaire structuren en de stabiliteit van het …
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Empirical Evaluation of Models Used to Predict Torso Muscle Recruitment Patterns
… the internal forces produced by back muscles have not been determined accurately. Two different approaches have historically been taken to predict muscle forces. The first relies on electromyography (EMG), while the second attempts to predict muscle responses using mathematical models. …
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Differences between adult and pediatric neck muscle stress due muscle recruitment patterns
… assumed that the soft tissue response, such as muscle force, was the same as for an adult.</p> <p>Recent studies have shown that not only are children different from adults due to the development of their skeleton, but that their ability to develop muscle force for a given cross-sectional area …
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The effect of alterations in effective seat tube angle on cycling performance, economy and muscle recruitment
… of effective seat tube angle (ESTA) on gross muscle activities, body kinematics and gross economy for well-trained cyclists. Methods: Ten well-trained male cyclists (mean ± SD; age 37.8 ± 3.6 years, height 178.2 ± 3.8 cm, body mass 76.9 ± 8.0 kg, VO₂ₘₐₓ 51.6 ± 5.3 ml/kg/min with 6.8 ± 2.6 …
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Muscle fatigue and other factors influencing forearm muscle activity
The wrist extensor muscles of the forearm exhibit relatively greater muscle activity than the wrist flexors during most hand/wrist tasks. Since the extensors operate at a greater percentage of maximum to balance wrist joint moments, this could contribute to their higher incidence of overuse injury. …
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Respiratory muscle work and inspiratory muscle training on cytokines, oxidative stress and diaphragm fatigue in younger and older populations
Increased respiratory muscle work is encountered during strenuous whole-body exercise, and at rest in older adults and those with pulmonary limitations such as chronic obstructive pulmonary disease (COPD). When sufficiently strenuous it can result in diaphragmatic fatigue, increased blood lactate …
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Visualizing muscular fatigue during running exercises with electromyography-derived variables.
… to observe if fatigue occurred in the leg muscles, specifically both gastrocnemius muscles and the vastus lateralis, during a running trial using electromyography to record the muscle activation signals. Post-processing methods calculated four parameters to detect fatigue: mean frequency, …
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A Comprehensive Methodology for Assessing Biomechanical Risks Associated with Hand Tool Use: Applied to Laparoscopic Surgical Instruments
… tasks. Electromyography was used to evaluate muscle recruitment and workload for small forearm muscles used in wrist stabilization. Point-force sensors were used to evaluate grip and actuation forces that occurred while using various laparoscopic medical devices. The force plate gathered …
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The Effect of Positioning on Pelvic Floor Muscle Activity as Evaluated with Surface Electromyography in Normals
… compare resting tone, maximal contraction, and muscle endurance measures before and after pelvic floor exercise instruction to determine intervention and demonstrate progress. There is little research that supports the use of biofeedback in positions other than supine. The purpose of this study …
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INFRARED NEURAL STIMULATION AND FUNCTIONALRECRUITMENT OF THE PERIPHERAL NERVE
… restore the most natural function to paralyzed muscles requires a very selective interface. Arguably, ideal selectivity would entail independent control over each neuron. Neural interfaces based on electrical stimulation of neurons have made the most progress in restoring movement in paralyzed …
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Experimental and Simulation Based Dynamic Assessment of Flexion and Extension Movements of Torso
… tasks involving dynamic trunk movements, muscle fatigue, and spinal instability are identified as major risk factors for developing low back pain. Dynamic stability and muscle forces during trunk flexion-extension movements are studied in this dissertation. Torso muscle fatigue is known to …
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Effect of 17β Estradiol & Foot Strike Patterns on Physiological & Biomechanical Changes in Runners
… of a transition program of SBR on the pattern of muscle activation, spatiotemporal variables, and stance phase kinetics. These running parameters were compared and contrasted during the menstrual cycle to assess whether estrogen fluctuation has an effect on the pattern of muscle activation, and …
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Characterizing Human Motor Adaptation and Learning When Using Different Occupational Exoskeletons
… Movement smoothness improved by 30%, and muscle activation patterns converged to those of experienced users over three sessions, yet novices retained up to ∼ 50% longer joint angular velocities. These results highlight the need for extended familiarization to achieve proficient and …
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Functional implications of the neuromuscular transform in decapod crustacean locomotion
… system must activate and effectively control muscle fibers capable of accomplishing the behavior. For multi functional muscles, an array of muscle fiber types must be selectively activated based on the behavioral task. In arthropods that have few motor neurons, it is not understod how the …
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Revealing complexities within flat-water kayaking: injury prevention and biomechanical analysis
… activation patterns of the trunk and pelvic muscles were measured using electromyography during a maximal 200 metre time trial. Gluteus medius, lower trapezius and erector spinae were measured for the first time in maximal kayaking. The latissimus dorsi, pectoralis major and external oblique …
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The influence of methylphenidate on heart rate and brain connectivity
The central governor model (CGM) proposes that muscle recruitment is regulated by the brain through subconscious homeostatic control of afferent feedback. It has been suggested that the dopaminergic system plays a key role in the CGM, with dopaminergic activation leading to lower fatigue …
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Self-paced treadmill as a rehabilitation tool for recovering functional gait in people with stroke
… community walking. The electrical activity of muscles (electromyograms) can reveal the underlying motor control strategy employed when walking in different contexts, for example indoors or community walking. Mathematical tools such as the variance ratio and the occurrence frequency provide a …
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Extraction of Electrocardiography Artefacts From Surface Electromyography Signals Using Continuous Wavelet Transform
… (sEMG) has been a problem when analysing the muscle activity. It has been shown that ECG contamination of the EMG signal in muscles of the trunk can influence time-based (amplitude) and frequency-based measures of the EMG signal. This has important implications when interpreting the amount of …
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