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An Insight into the Importance of Wrist Torque in Driving the Golfball: A Simulation Study

Eric J. Sprigings and Robert J. Neal

The purpose of this study was to examine whether, in theory, the clubhead speed at impact could be increased by an optimally timed wrist torque, without jeopardizing the desired club position at impact. A 2-D, three-segment model comprising torso, left arm, and golfclub was used to model the downward phase of the golf swing. Torque generators that adhered to the activation and force-velocity properties of muscle were inserted at the proximal end of each segment. Separate simulations were performed, with the wrist joint generator enabled then disabled. The results from these simulations showed that significant gains in clubhead speed (≈9 %) could be achieved if an active wrist torque was applied to the club during the latter stages of the downswing. For a swing that produced a clubhead speed of 44 m/s (≈99 mph), the optimal timing for the activation of wrist torque occurred when the arm segment was approximately 30° below a horizontal line through the shoulder joint. The optimal activation time for the joint generators was very much dependant on the shape of the torque profiles. The optimization process confirmed that maximum clubhead speed was achieved when the torque generators commenced in sequential order from proximal to distal.

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OpenSim Versus Human Body Model: A Comparison Study for the Lower Limbs During Gait

Antoine Falisse, Sam Van Rossom, Johannes Gijsbers, Frans Steenbrink, Ben J.H. van Basten, Ilse Jonkers, Antonie J. van den Bogert, and Friedl De Groote

Musculoskeletal models for biomechanical simulations have become increasingly popular to analyze human movement. In addition to joint kinematics and kinetics, musculoskeletal models enable researchers and clinicians to assess other biomechanical variables, such as muscle lengths and forces

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Differences in Muscle Demand and Joint Contact Forces Between Running and Skipping

Sarah A. Roelker, Paul DeVita, John D. Willson, and Richard R. Neptune

skipping and running steps and cycles at the hip and ankle. Musculoskeletal modeling and simulation techniques enable investigations of the underlying neuromuscular mechanisms that contribute to experimental biomechanical and metabolic observations. Simulation studies determined that the hip extensors

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Tai Chi Is Safe and Effective for the Hip Joint: A Biomechanical Perspective

Jianwei Duan, Kuan Wang, Tongbo Chang, Lejun Wang, Shengnian Zhang, and Wenxin Niu

positive effect on improving the elastic modulus of cartilage and slowing cartilage degradation. Many clinical studies have proved that the Tai Chi had a positive effect on knee OA ( Chang et al., 2016 ; Zhu et al., 2016 ). A recent FE simulation showed that compared with walking, the peak contact stress

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In Silico Biomarkers of Motor Function to Inform Musculoskeletal Rehabilitation and Orthopedic Treatment

Ilse Jonkers, Erica Beaucage-Gauvreau, Bryce Adrian Killen, Dhruv Gupta, Lennart Scheys, and Friedl De Groote

loading? Answering these questions requires access to variables related to dynamic MSK function that cannot be measured noninvasively. MSK modeling workflows combine integrated 3D motion capture data with MSK models and dynamic simulations of motion, thereby using physics-based evaluation to estimate in

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Optimizing Whole-Body Kinematics During Single-Leg Jump Landing to Reduce Peak Abduction/Adduction and Internal Rotation Knee Moments: Implications for Anterior Cruciate Ligament Injury Risk

Dhruv Gupta, Jeffrey A. Reinbolt, and Cyril J. Donnelly

, Donnelly et al 11 used optimization methods with computer simulations to find optimal whole-body kinematics during the high-velocity sporting task of side stepping. They found that the general kinematic strategy to reduce the peak valgus knee moment during the sidestepping task was to redirect the whole

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Comparing Methods for Using Invalid Days in Accelerometer Data to Improve Physical Activity Measurement

Hotaka Maeda, Chris C. Cho, Young Cho, and Scott J. Strath

has not been compared empirically to each other. Therefore, the purpose of this semi-simulation study was to compare the accuracy of recently developed methods to estimate free-living average counts per day using all accelerometer data, including the invalid days. Methods Data from the publicly

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Using Monte Carlo Simulation to Propagate Processing Parameter Uncertainty to the Statistical Analyses of Biomechanical Trajectories

Todd C. Pataky

arms, propagate to uncertainty in final results. Plausible value ranges for these biomechanical model parameters can generally be determined through in vitro and/or in vivo experimentation. Although not generally appearing in the literature, MC simulations can also handle uncertainty in nonmeasurable

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Effect of the Use of High-Fidelity Manikin Simulation for Learning Emergency Cardiovascular Care Skills: A Critically Appraised Topic

Hannah L. Stedge and Theresa Miyashita

Key Points ▸ High-fidelity manikin simulation is effective for improving athletic training students' self-confidence and self-efficacy in performing cardiac care skills. ▸ Future research is needed to determine if high-fidelity simulation is more effective at improving self-confidence than low

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Visual Search Strategy During Regatta Starts in a Sailing Simulation

Aaron Manzanares, Ruperto Menayo, and Francisco Segado

, Romanel-Sur-Morges, Switzerland) reproduced images and provided a sound simulation. The VSail-Trainer ® has two hardware components: the cockpit and the computer. The computer controls the software and the navigation conditions, the projection, and the sound of the simulated situation. The cockpit is