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OpenSim 4.5 Now Available
We are pleased to announce the following new features, bug fixes, and other improvements in OpenSim 4.5. The new software includes improvements to the look and feel of the GUI, published Conda and Docker packages, additional Moco functionality, and the introduction of FunctionBasedPath for function-based muscle wrapping. We also now distribute a version of the Rajagopal model with the OpenSim resources folder included in the OpenSim application. Visit the Downloads page for more details.
Webinar: Energetics and Big Data Approach Explain Ecological Running Speeds
We are pleased to announce our upcoming webinar by Dr. Jess Selinger from Queens University. She will present her approach to characterize runners’ speeds in a free-living environment using a commercial tracking device and determine if preferred speed is consistent with task- or energy-dependent objectives. In the second part of the webinar, Dr. Selinger will review several key principles about best practices for analyzing large-scale health data from wearables, and how she applied them in her analysis.
Webinar: Estimating Energy Expenditure during Exercise Using Wearable Sensors
We are pleased to announce our upcoming webinar with Patrick Slade from Stanford University. He will present an overview of an algorithm that can provide real-time estimates of energy expenditure during common steady-state and time-varying activities with substantially lower error than state-of-the-art methods. In the second part of the webinar, Dr. Slade will guide participants through a hands-on tutorial on applying the algorithm to data acquired from inertial measurement units (IMUs).
Apply for Digital Human Modeling Postdoctoral Fellowships at Stanford University
A team of faculty at Stanford University, including Professors Scott Delp, Garry Gold, Karen Liu, Akshay Chaudhari, Ellen Kuhl, Oussama Khatib, Fei Fei Li, and Serena Yeung is accepting applications for several Postdoctoral Fellows in digital human modeling. Individuals with backgrounds in biomechanics, neuroscience, biomedical imaging, biomedical informatics, robotics, and computer science are all welcome to apply.
OpenSim Webinar - Inverse Kinematics: A Bayesian Versus Least-Squares Approach
We invite you to join us for a webinar featuring Todd Pataky from Kyoto University. In this webinar, Pataky will describe how Bayesian calculations can be used to maximize the probability that a specific set of joint angles would produce the observed marker positions. This talk will assume no knowledge of Bayesian statistics, and will work from fundamental Bayesian concepts to simple IK models, then finally to explain why Bayesian IK appears to outperform least-squares approaches. The webinar will be held Monday, July 20, 2020 4:00 p.m. Pacific Time. To learn more or to register, visit
OpenSim Webinar - Automating OpenSim Workflows: An Intro to the OpenSim API in Matlab
We invite you to join us for a webinar featuring Christopher Dembia from Stanford University. In this webinar, Dr. Dembia from the OpenSim development team will introduce you to OpenSim’s API in Matlab, starting from the very basics. He will discuss how to build a point-mass model, simulate it, and then analyze the simulation. He will also discuss key concepts, such as the difference between the Model and State. The webinar will be held Tuesday, July 7th, 2020 at 10:00 a.m. Pacific Time. To learn more or to register, visit
OpenSim Webinar: Which simulation pipeline should I use? An overview of common workflows
We invite you to join us for a webinar featuring Carmichael Ong from Stanford University. In this webinar, Ong will provide researchers with guidance on the wide array of simulation pipelines available today for use with OpenSim. These pipelines include methods built into OpenSim, such as inverse dynamics, static optimization, Computed Muscle Control, and forward dynamics. The webinar will be held Wednesday, April 29th, 2020 at 8:00 a.m. Pacific Time. To learn more or to register, visit
OpenSim Webinar: Characterizing hyperreflexia and abnormal coordination in post-stroke stiff-knee gait
We invite you to join us for a webinar featuring Tunc Akbas from Harvard University. In this webinar, Dr. Akbas will present a novel framework towards delineating the neuromuscular mechanisms of abnormal coordination in post-stroke SKG using OpenSim. Dr. Akbas will also discuss how this framework can be used to identify individualized assistance patterns to avoid hyperreflexia and serve as a template for exoskeletal assistance post-stroke. The webinar will be held Thursday, March 12, 2020 at 10:00 a.m. Pacific Time. To learn more or to register, visit
OpenSim Webinar: Computational Models of Reaching to Test Hypotheses in Motor Control
We invite you to join us for a webinar featuring Mazen Al Borno from Stanford University. In this webinar, Dr. Al Borno will share the computational results leading to this theory and describe the experimental verification using neural recordings from rhesus monkeys. Dr. Al Borno will also highlight their computational experiments to determine whether synergies introduce task performance deficits, facilitate the learning of movements, and generalize to different movements. The webinar will be held Tuesday, February 11th at 10:00 a.m. Pacific Time. To learn more or to register, visit
Apply to the Next OpenSim Advanced User Workshop at Stanford University
We are now accepting applications for a three-day, project-based workshop on the Stanford University campus. This workshop is intended for advanced OpenSim users and developers who want to work with the OpenSim staff on specific research projects. We highly encourage collaborators to participate in the workshop together. Travel awards will be granted to top workshop applicants (individuals or groups). Applications are due January 14, 2020. Read more and learn how to apply at, https://opensim.stanford.edu/support/event_details.php?id=238&title=OpenSim-Advanced-User-Workshop.