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Credits and licences

MyoHeat runs a biomechanics model in your browser. Its bones, joint centres, muscle paths and muscle strengths come from two published OpenSim models. MyoHeat is free and non-commercial.

Anatomical models

Legs, pelvis, spine and skull: Rajagopal full-body model

The 2023 revision with modifications by Lai et al. and Uhlrich et al., from simtk.org/projects/full_body and opensim-models.

Rajagopal A, Dembia CL, DeMers MS, Delp DD, Hicks JL, Delp SL. Full-body musculoskeletal model for muscle-driven simulation of human gait. IEEE Trans Biomed Eng. 2016;63(10):2068–79. doi
Lai AKM, Arnold AS, Wakeling JM. Why are antagonist muscles co-activated in my simulation? Ann Biomed Eng. 2017;45:2762–74. doi
Uhlrich SD, Jackson RW, Seth A, Kolesar JA, Delp SL. Muscle coordination retraining inspired by musculoskeletal simulations reduces knee contact force. Sci Rep. 2022;12:9842. doi

Licence text

Copyright (c) 2015, Stanford University

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 
SOFTWARE.

Arms and shoulders: MoBL-ARMS upper limb model

BSD 3-Clausenon-commercial use only

Version 4.1, from simtk.org/projects/upexdyn. It builds on Holzbaur et al. (2005).

Saul KR, Hu X, Goehler CM, Vidt ME, Daly M, Velisar A, Murray WM. Benchmarking of dynamic simulation predictions in two software platforms using an upper limb musculoskeletal model. Comput Methods Biomech Biomed Engin. 2015;18(13):1445–58. doi
McFarland DC, McCain EM, Poppo MN, Saul KR. Spatial dependency of glenohumeral joint stability during dynamic unimanual and bimanual pushing and pulling. J Biomech Eng. 2019;141(5):051006. doi
Holzbaur KRS, Murray WM, Delp SL. A model of the upper extremity for simulating musculoskeletal surgery and analyzing neuromuscular control. Ann Biomed Eng. 2005;33(6):829–40. doi

Licence text

Copyright (c) 2014-present, North Carolina State University, Northwestern University, Rehabilitation Institute of Chicago, Valparaiso University, Wake Forest University, Stanford University and VA HCS.
All rights reserved.
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The MoBL-ARMS upper limb model has been open sourced solely for non-commercial purposes (including research, academic, evaluation and personal uses) under the BSD 3-Clause License below. By downloading or using this software, (1) you accept the terms and conditions of the aforementioned open source license, (2) acknowledge that your use of this software is non-commercial and commercial use requires a commercial license, and (3) accept that use of the model software must be acknowledged in all publications, presentations, or documents describing work in which the MoBL-ARMS upper limb model is used by citing the following work:

Saul KR, Hu X, Goehler CM, Daly M, Vidt ME, Velisar A, Murray WM. Benchmarking of dynamic simulation predictions in two software platforms using an upper limb musculoskeletal model. Computer Methods in Biomechanics and Biomedical Engineering. 2015; 18:1445-58.

McFarland, D. C., McCain, E. M., Poppo, M. N., and Saul, K. R. (March 25, 2019). "Spatial Dependency of Glenohumeral Joint Stability During Dynamic Unimanual and Bimanual Pushing and Pulling." ASME. J Biomech Eng. May 2019; 141(5): 051006. https://doi.org/10.1115/1.4043035 (2019)

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Copyright (c) 2014-present, North Carolina State University, Northwestern University, Rehabilitation Institute of Chicago, Valparaiso University, Wake Forest University, Stanford University and VA HCS.
All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

What MyoHeat adds

The model authors are not responsible for MyoHeat and have not endorsed it. MyoHeat adds:

the physics (inverse dynamics and muscle load sharing);
the exercise poses;
the trunk and shoulder-blade muscles, which are hand-placed;
a strength scale for trained lifters (1.5×).

MyoHeat is checked against published measurements of moment arms, joint moments and EMG. It currently passes 45 of 61 checks, and its known errors are documented.

Privacy

MyoHeat counts visits and a few actions (which exercise or muscle you pick, and shares) to learn what people use. It sets no cookies, and it doesn't store your IP address or anything that identifies you across days. Nothing is sold or shared.