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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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Neil Chapman, John William Whitting, Suzanne Broadbent, Zachary Crowley-McHattan, and Rudi Meir

-up on a cycle ergometer, each participant performed 3 baseline maximal voluntary isometric contractions (MVICs) of the knee flexors (5-s duration) at 150° knee flexion. The experimental (poststretch isometric) contraction involved 3 experimental trials in which the knee flexors were voluntarily

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Paul Head, Mark Waldron, Nicola Theis, and Stephen David Patterson

as familiarization sessions, with the experimental conditions performed in the final 4 sessions. During the first visit, height, weight, ABI, knee extension maximal voluntary isometric contraction (MVIC), vastus medialis (VM) and vastus lateralis (VL) muscle thickness, AOP, and NMES maximum tolerable

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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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Joel L. Prowting, Debra Bemben, Christopher D. Black, Eric A. Day, and Jason A. Campbell

 = maximal voluntary isometric contraction; BM = body mass. Experimental Design A double-blinded, placebo (PLA)-controlled independent groups design was utilized, with participants randomly assigned to receive 15 g/day of either hydrolyzed CP (Vital Proteins Collagen Peptides, Chicago, IL; n  = 7) or an

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Daniel Gilfeather, Grant Norte, Christopher D. Ingersoll, and Neal R. Glaviano

ratio between the volitional muscle contraction and muscle activation elicited by an exogenous electrical stimulus. 13 SIBT is the application of an electrical stimulation during a maximal voluntary isometric contraction (MVIC) that, in theory, activates the remaining motor units that the patient was

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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