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 33 for “"Isometric Contraction"”.
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EMG Threshold Detection and Reliability of Boys and Men Using an Isometric Contraction Protocol
… at relatively low muscle force. By using an isometric contraction protocol to determine EMGth, participants will reach higher relative muscle forces at exhaustion, thus facilitating the determination of EMGTh. Twenty-one boys and 21 men participated in the study. Participants completed a one …
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The effect of change to duration of isometric contraction in muscle energy technique to the upper cervical spine
… effectiveness of MET on the optimal duration of isometric contraction during the technique. The aim of this study was to investigate the effect of various durations of MET isometric contractions on active atlanto-axial rotation range of motion. 52 asymptomatic subjects (age 18-43) who displayed a …
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The reliability of an isometric test based on constant perception of effort
… procedure to extrapolate findings of an isometric nature to a whole body performance setting. The purpose of this study was to quantify the reliability of perceived exertion to control neuromuscular output during an isometric contraction. 21 varsity athletes completed a maximal voluntary …
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Cardiovascular responses to two minutes of isometric contractions of the finger flexors in healthy women
… submaximal (20% MVC) and maximal (100% MVC) isometric contraction of the finger flexors in healthy women between the ages of 20 and 35 years. The cardiovascular variables which were investigated included; heart rate (HR), systolic blood pressure (SBP), diastolic blood pressure (DBP), mean …
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Impedance Changes in Biceps Brachii Due to Isometric Contractions and Muscle Fatigue Using Electrical Impedance Myography (EIM)
… relationship between muscles at rest and during isometric contractions at various force levels(25%, 50%, and 100% of maximum voluntary contraction) of the biceps brachii over a multifrequency spectrum. Impedance measurements due to muscle fatigue was further studied and compared to muscles under …
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Orientation of the Cardiac Myosin Regulatory Light Chain Determined by Polarized Fluorescence
… (MLCK) modulates the force and speed of muscle contraction, but the mechanisms of RLC‐mediated regulation in striated muscles are less well<br/>understood than those of Ca2+‐dependent regulation via troponin in the thin<br/>filament.<br/>To help elucidate the role of RLC in muscle regulation, …
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EMG measurement of the adductor muscles during walking and running
… hip joint angles and during incremental isometric contraction. In addition, it explored the relationship between adductor torque and the corresponding EMG amplitudes during ramped isometric contraction in 10 participants. Study 2 investigated the between-day reliability for EMG …
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Effect of Shoulder Angle on the Activation Pattern of the Elbow Extensors During a Submaximal Isometric Fatiguing Contraction
… of the elbow extensors during a fatiguing contraction. METHODS: Ten young men (23.5 ± 1.7) were tested on two occasions with the shoulder at either 0° or 90° of flexion. Baseline isometric maximum voluntary contraction torque and the EMG-torque relationship were determined prior to a …
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Behaviour of single motor units in human skeletal muscle
… of motor units at particular grades of isometric contraction depend on the total number of units available for recruitment and so are regulated by length and tension receptors in the muscle. Procainisation showed the importance of the gamma- regulated length receptors in voluntary …
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The Effect of Ischemic Preconditioning on Rock Climbing Performance
<p>Rock climbing involves isometric contractions of the finger flexors, limiting forearm blood flow and causing ischemia-induced fatigue. Ischemic preconditioning (IPC) has been shown to improve time to failure (TTF) during climbing-specific tasks, though its mechanisms remain unclear. The purpose …
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Joint Torque Feedback for Motion Training with an Elbow Exoskeleton
… that JTFs during the same directional muscle's isometric contraction yields a larger slope, in mNm/mNm, than the opposing direction (7.36 times and 1.02 times for extension torque and flexion torque). Finally, the guidance performance of the JTF was evaluated in terms of time delay and position …
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The Relationship Between Integrated Electromyography and Torque at Varying Joint Angles and Intensities of The Static Contraction of the Rectus Femoris Muscle in Normal Female Subjects
… of torque and IEMG were recorded for each contraction. There was no linear relationshipo between torque and IEMG at varying joint angles (r = -0.101).</p><p>For the second phase, the subject was required to perform a sub-maximal static exercise of knee extension for 10 seconds at 20 …
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Motor unit firing rate control of agonist skeletal muscle during voluntary isometric and shortening contractions with limb movement
… mammalian lifespan require skeletal muscle contractions that are controlled by time- and recruitment-dependent firing rate patterns. Single motor unit (MU) activity reflects the final efferent neural drive to the muscle, yet the underlying neural control of movement at the MU level is not …
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Exercise induced damage to skeletal muscle and connective tissue
… following eccentric and concentric muscle contractions of the knee extensors (KE). Electrically stimulated eccentric contractions of the KE induced delayed onset muscle soreness (DOMS), a delayed increase in serum creatine kinase (CK) activity, and disruption of muscle function. KE maximum …
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Characterization of 5-Hydroxytryptamine-Evoked Isometric Contractile Responses in Aortic Vascular Smooth Muscle in Thyropathological Rats
… (serotonergic; 5-HT) receptor function mediating contraction/dilation in rat aorta have not been completely characterized. Procedure. Aortic rings from hyperthyroid (TRX),hypothyroid (PTU), and euthyroid control (CON) rats were mounted in climate controlled tissue baths and subjected to isometric …
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The comparison of physiological adaptations following a 4-week cycle and shuttle run-based SIT interventions
… body composition assessment, maximal voluntary isometric contraction (MVIC) of hamstring and quadriceps muscle groups, Wingate 30-second anaerobic test and Time to Exhaustion (TTE) with breath-by-breath gas analyser to determine maximal oxygen consumption (VO<sub>2max</sub>). The training …
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Neuromuscular fatigue following a singles badminton match
… used in the present study. Maximal voluntary isometric contraction (MVC) torque of the knee extensors and flexors, voluntary activation during the knee extension MVC (VA), torque generated by a doublet (DT), and 20 Hz (T20) and 80 Hz stimulation (T80) and the ratio (T20/T80) for the knee …
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The Effects of Exercise-Induced Muscle Damage With or Without Omega-3 Supplementation on Inflammation, Muscle Function and Recovery in Healthy Physically Active Younger and Older Adults
… functional measures included maximal voluntary isometric contraction (MVIC), peak power, countermovement jump, range of motion (ROM), delayed onset muscle soreness (DOMS) and thigh circumference. Key results from Study 1 included DOMS being significantly lower in omega-3 vs placebo group (p = …
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Using Thermography to Evaluate the Effects of Arm Flexion and Loading on the Anterior Deltoid during a Simulated Overhead Task
Shoulder injuries are a focus of work related musculoskeletal disorder (WMSD) research due to rising healthcare costs, an aging workforce, and long recovery times. Substantial research has been performed in the area of shoulder WMSDs and a number of risk factors have been implicated in their …
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