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Dae-Hyun Kim, Jin-Hee Lee, Seul-Min Yu and Chang-Man An

equipment. After a 10-minute rest time, each participant was seated in a comfortable and upright position with a 110° hip flexion and 60° knee flexion to generate maximal voluntary isometric contraction (MVIC) of the knee joint. 11 , 12 Their trunk, pelvis, and thigh were fixed to the dynamometer chair

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Erika Zemková and Michal Jeleň

University in Bratislava (nos. 3/2017 and 4/2017). Experimental Design This is a cross-sectional study designed to assess the effect of fatigue on the ability to estimate 50% of maximal voluntary isometric contraction (MVC) of the back muscles, either with or without feedback information on the force

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Pier Paolo Mariani, Luca Laudani, Jacopo E. Rocchi, Arrigo Giombini and Andrea Macaluso

significant decline in maximal voluntary isometric contraction (MVIC) and voluntary activation. 15 , 16 The mean MVIC decreases of 50% in comparison with nonaffected limb during the first postoperative month and increases approximately linearly during the following rehabilitation phases. Likewise, Drechsler

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Lucas Ettinger, Jason Weiss, Matthew Shapiro and Andrew Karduna

In this study, we aimed to determine if electromyography (EMG) normalization to maximal voluntary isometric contractions (MVIC) was influenced by subacromial pain in patients with subacromial impingement syndrome. Patients performed MVICs in unique testing positions for each shoulder muscle tested before and after subacromial injection of local anesthetic. In addition to collection of MVIC data, EMG data during an arm elevation task were recorded before and after injection. From a visual analog pain scale, patients had a 64% decrease in pain following the injection. Significant increases in MVICs were noted in 4 of the 7 shoulder muscles tested: anterior, middle and posterior deltoid, and lower trapezius. No significant differences were noticed for the upper trapezius, latissimus dorsi, or serratus anterior. MVIC condition (pre and post injection) had a significant influence on EMG normalization for the anterior deltoid and lower trapezius muscle. Results indicate that subacromial pain can influence shoulder muscle activity, especially for the deltoid muscles and lower trapezius. In addition, normalization to MVIC in the presence of pain can have unpredictable results. Caution should be taken when normalizing EMG data to MVIC in the presence of pain.

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Rebecca Quinlan and Jessica A. Hill

polo simulation activity. 17 In contrast to this, positive effects of TCJ were observed in semiprofessional soccer players following the Loughborough Intermittent Shuttle Test (LIST). 14 Bell et al 14 observed improved recovery of maximal voluntary isometric contraction (MVIC), countermovement jump

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Grant E. Norte, Katherine R. Knaus, Chris Kuenze, Geoffrey G. Handsfield, Craig H. Meyer, Silvia S. Blemker and Joseph M. Hart

postsurgery, and (3) percent change presurgery to postsurgery. Secondary outcome measures of quadriceps function included knee extension maximal voluntary isometric contraction torque (T MVIC ), quadriceps central activation ratio (CAR), and superimposed burst torque (T SIB ). Participants In total, 4

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Chad Van Ramshorst and Woochol Joseph Choi

of 100 milliseconds. These processed EMG data were divided by maximum EMG activity during maximal voluntary isometric contraction to acquire %MVIC during knee and hip contact. To acquire the maximum EMG activity, manual muscle testing was conducted for each of the muscles. Subjects lay sideways with

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Melissa DiFabio, Lindsay V. Slater, Grant Norte, John Goetschius, Joseph M. Hart and Jay Hertel

, peak torque, total work, and power at both isokinetic velocities were normalized to body mass. Isometric testing for maximal voluntary isometric contraction (MVIC) and fatigue index for the quadriceps and hamstrings were completed following the isokinetic assessment. The participant’s leg was secured

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Karenina Arrais Guida Modesto, Pedro Ferreira Alves de Oliveira, Hellora Gonçalves Fonseca, Klaus Porto Azevedo, Vinicius Guzzoni, Martim Bottaro, Nicolas Babault and Joao Luiz Quagliotti Durigan

, and Russian current. Values are mean (SD). MVIC indicates maximal voluntary isometric contraction; RMS, root mean square. There is no significant difference ( P  > .05). The evoked torque showed a significant main time effect ( F  = 63.29, P  < .01, power = 1, η p 2 = .7 ). There was an increase in

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Afshin Moghadasi, Gholamali Ghasemi, Ebrahim Sadeghi-Demneh and Masoud Etemadifar

. 22 The testers were blind to the group (control or training) each subject allocated to. Biodex Isokinetic Dynamometer (Biodex 3, Shirley, NY) was used for measuring the knee proprioception (joint position sense) absolute error and maximal voluntary isometric contraction (MVIC) of knee flexor and