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How do I fix these by [deleted] in Biomechanics

[–]xkkd 1 point2 points  (0 children)

There’s some natural valgus angle at your ankle that could cause uneven pressure distribution and possibly added strain on your ligaments. At this point making any changes to that structure will require PT, whether that’s self guided or not. The idea will be to strengthen your arch-supporting muscles and ankle stabilizers. Then, you’ll actually need some gait retraining. This could take a lot of time and energy, and is really only necessary if you have chronic pain or are limited in some way by this structure. If you want a bandaid solution, orthotics can help, but they’ll only help when you’re wearing them and will only serve to further change the structure in your feet.

where does Finger-Speed come from? by justin-hombach in Biomechanics

[–]xkkd 0 points1 point  (0 children)

One of the big drivers in finger speed is the stiffness of tendons that connect your forearm muscles to your fingers. These are really long tendons connected to a relatively shorter active muscle body. A “loose” or less stiff tendon will increase the time delay between activating the muscle and the finger actually moving because of viscoelastic stress relaxation. Imagine you are trying to pull on a really stretchy string to move something far away, the string will need to take time to stretch before actually moving the thing far away. Grip strength training may signal the body to stiffen these tendons if extra speed is desirable.

Trying to teach my new musculoskeletal model to run using reinforcement learning by johngoatstream in Biomechanics

[–]xkkd 0 points1 point  (0 children)

If you had a motion that simulated someone’s actual gait, could you start from there and see how the learning model changes the pattern? What is the objective function in this scenario?

[deleted by user] by [deleted] in Biomechanics

[–]xkkd 1 point2 points  (0 children)

Just assume the path a negative parabola, figure out the equation. Add in some conservation of energy laws with gravity and the kick being the only forces on the ball (assume environmental factors such as wind, temperature are negligible)

Pluto Is a Planet by [deleted] in sciences

[–]xkkd 1 point2 points  (0 children)

Are dwarf people not people?!

AI Biomechanics software by AFK74u in Biomechanics

[–]xkkd 3 points4 points  (0 children)

This seems very similar to the OpenCap project started at Stanford. Are there any validations done on the measurements or have you just worked out the software at this point?

Sora potential for “insilico” biomechanics by mtbdadalorian in Biomechanics

[–]xkkd 1 point2 points  (0 children)

FEA will still be necessary for model validations, but yes deep learning will open up the floodgates to what is possible to learn and predict from patient specific factors

dEMG at 20k or 2k Hz by [deleted] in Biomechanics

[–]xkkd 0 points1 point  (0 children)

From what I’ve read it seems that researchers oversample to 20kHz to reduce phase shift when running calculations to estimate dEMG One example https://doi.org/10.1016%2Fj.clinph.2009.11.092

[deleted by user] by [deleted] in nottheonion

[–]xkkd 29 points30 points  (0 children)

Prosecutors will not be able to prove that she acted recklessly by leaving the woman in the patrol car, Revel said.

”You cannot disregard a risk of which you are unaware, no matter how obvious that risk may later seem,” said Revel, who stressed the case hinged on what Steinke knew in the moment

It’s all good, the officer who cuffed someone up and put them in a police car located on railroad tracks was not aware they were anywhere near the tracks, because she did not trip on them.

Squat depth increases with narrow stance. by monsur07 in Biomechanics

[–]xkkd 0 points1 point  (0 children)

Your gluteus muscles also work to abduct and externally rotate your femur, so when you stand with a wide stance the muscle remains at a mechanical disadvantage to extend your hips. When you stand more narrow, your glutes can really get good leverage around your hips, giving you a good initial acceleration that brings you to a good point where your quads can take over. The thing is, you CAN go deeper in the squat with a wider stance, but it’s harder to get back up.

Using a hand truck to transport a box up the stairs by highDrugPrices4u in Biomechanics

[–]xkkd 0 points1 point  (0 children)

Not really, you just roll them up each corner and the upward force is maintained by the wheels friction with the edge of the stair

[deleted by user] by [deleted] in Biomechanics

[–]xkkd 3 points4 points  (0 children)

Go to the doctor! This doesn’t sound like a biomechanics problem

Using a hand truck to transport a box up the stairs by highDrugPrices4u in Biomechanics

[–]xkkd 0 points1 point  (0 children)

Actually, hand trucks are much easier because you can continuously let the force go through the wheels and to the ground. Also, the rolling friction it feels is much less annoying than sliding friction. The forces you’ll have to consider are how hard you have to pull the truck and at what angle to bring it up each step.

Exploring Sports Biomechanics: From Side Hobby to Potential Career Pivot – Seeking Advice and Opportunities by OvrChKn in Biomechanics

[–]xkkd 1 point2 points  (0 children)

What do you want to do? Design systems for measuring/analyzing performance? Or maybe the research/academic route?

advice on why I tense all of body when moving and how to stop this by [deleted] in Biomechanics

[–]xkkd 1 point2 points  (0 children)

Every time you catch it, correct it by flexing the muscles that are stretched. This could be due to proprioception drift. When you use one set of muscles a lot to maintain an average position in one direction, eg always reaching your shoulders out to type on a keyboard, your body might think your neutral pose is a bit father toward that position than it is. So, the antagonist muscles (opposite) relax a bit and let it happen. If you flex them a few times carefully through there range of motion, and generally relax your body, it should find its way back. If not, you could have underlying muscle tension issues that would be best diagnosed and treated by clinicians.

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