iiinova — where your digital self keeps evolving

Jeremy Crenshaw @jrcrenshaw.bsky.social · 17/07/2025

I stepped into a bookstore while on vacation in DC last week. Found this graphic novel.

Jeremy Crenshaw @jrcrenshaw.bsky.social · 19/05/2025

I am honored to be elected as the next Program Director for the University of Delaware (@udelaware.bsky.social) Biomechanics and Movement Science interdisciplinary graduate program. To our notable alumni network: Stay tuned for ways to engage with and support our students.

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Reposted by Jeremy Crenshaw

KinesKing (been this name for years, but I'm really Paul DeVita) @kinesking.bsky.social · 10/04/2025

Univ of Delaware is an NBD Solid Rock with giant, varied, and exciting NBD celebrations every year!! This just in: UDel approaches 1,000 NBD student visitors since 2017! Next year, OVER THE TOP! Thank you Jeremy, Jocelyn and all your colleagues and students, our friends in #Biomechanics. #NBD2025

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Jeremy Crenshaw @jrcrenshaw.bsky.social · 04/04/2025

We had an engaging National Biomechanics Day today at the University of Delaware! Nearly 100 high school students toured 10 different labs! Here are the faculty and graduate students that made it happen. Thank you to them, and thank you to our participating schools! @biomechanicsday.bsky.social

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Jeremy Crenshaw @jrcrenshaw.bsky.social · 02/04/2025

Thanks for putting this on today. There were some thought-provoking ideas that I've already shared with my lab. I highly recommend the session to those who can attend the next one on Friday. It's relevant to both mentors and mentees.

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Jeremy Crenshaw @jrcrenshaw.bsky.social · 24/02/2025

This paper was finally reviewed and accepted.

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Jeremy Crenshaw @jrcrenshaw.bsky.social · 22/02/2025

This isn't an endorsement, as I need to look more into the organization. However, those near DC (and other locations) may be interested in this March 7th event.

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Jeremy Crenshaw @jrcrenshaw.bsky.social · 05/02/2025

Politics tangle with things that we find, Truth weighed against an uncertain mind. Yet science stands steady—its course never swayed, Though doubt and dissent cast fleeting shade. (3/n)

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Jeremy Crenshaw @jrcrenshaw.bsky.social · 05/02/2025

The grants are a battle, the funding is tight, We write and rewrite through many a night. Peer review lingers, the journals delay, Yet passion still pulls us to fight through the fray. (2/n)

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Jeremy Crenshaw @jrcrenshaw.bsky.social · 03/02/2025

I've never played toribash, but my lab did fail miserably at a QWOP challenge against @stephenpiazza.bsky.social www.foddy.net/Athletics.html

foddy.net

QWOP

Athletics Game

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Jeremy Crenshaw @jrcrenshaw.bsky.social · 31/01/2025

I'm looking for "Fun Biomechanics Links" for my course. Do you have interesting articles, videos, or websites? ChatGPT tells me that these terms describe what I'm looking for: #sick #slaps #nextlevel #crazy #wild #nocap #insane #hype #litty #goated #W #turnt #lowkeycool #deep #noway

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Jeremy Crenshaw @jrcrenshaw.bsky.social · 28/01/2025

For a course I teach, I need to update this list of content related to justice, equity, diversity, and inclusion in science and healthcare. Please let me know if you have any suggested additions. docs.google.com/document/d/1...

docs.google.com

KAAP400 JEDI

Justice, Equity, Diversity, and Inclusion Reading List Please notify the instructor if links aren’t viable. Click here for an additional reading list! Point of View Affects How Science is Done Too ...

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Jeremy Crenshaw @jrcrenshaw.bsky.social · 28/01/2025

Thank you! I think I already have the link for this one.

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Jeremy Crenshaw @jrcrenshaw.bsky.social · 27/01/2025

If your seminar series is streamed virtually and open to those outside of your institution, please share the link! I will pass that information on to undergraduate students in my Research Methods course. Thank you!

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Reposted by Jeremy Crenshaw

Jason Franz @franzbiomech.bsky.social · 22/01/2025

Fun with ultrasound! Latest from Emily Eichenlaub "Anticipation augments distal leg muscle neuromechanics before, during, and after treadmill-induced perturbations applied during walking". @jbiomech.bsky.social @allenjl12.bsky.social @jrcrenshaw.bsky.social www.sciencedirect.com/science/arti...

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Jeremy Crenshaw @jrcrenshaw.bsky.social · 21/11/2024

-for some people -I doubt it -please stop -I'll get back to you in 11 months -yes, but I'm open to different justifications

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Jeremy Crenshaw @jrcrenshaw.bsky.social · 24/01/2024

Any suggestions for where I can buy motion capture markers with no delayed shipping?

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Jeremy Crenshaw @jrcrenshaw.bsky.social · 13/01/2024

Thought- and anxiety-provoking podcast on fraud in academia. open.spotify.com/episode/1NiZ...

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Jeremy Crenshaw @jrcrenshaw.bsky.social · 21/12/2023

Happy holidays to you! That indeed was NBD. Also, NBD made the "Top ten-ish college events of 2023" from our Dean. We have started our 2024 planning!

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Jeremy Crenshaw @jrcrenshaw.bsky.social · 20/12/2023

I'm thankful for where I work! It's fun to see my students, colleagues, and community in this video. There is even a National Biomechanics Day clip! www.youtube.com/watch?v=rGqw...

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Jeremy Crenshaw @jrcrenshaw.bsky.social · 16/12/2023

It's a new environment! For teaching, I may generate AI-driven text, and then have students critically evaluate statements and cited work. For research, I'll use AI as to see what I may not be considering. I'll also use it as a copy editor for ideas on how to revise things for clarity.

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Jeremy Crenshaw @jrcrenshaw.bsky.social · 16/12/2023

I teach an undergrad Research Methods class which includes an NIH-style aims page assignment. I was curious what AI would generate when prompted to write such a page. It was surprisingly good. e.g. g.co/bard/share/f... I'm thinking creatively how to include this in teaching & as a research tool.

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Jeremy Crenshaw @jrcrenshaw.bsky.social · 14/12/2023

This has been a productive thread. Now I just asked AI to make a paragraph of old written text "better". The results were surprisingly good.

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Jeremy Crenshaw @jrcrenshaw.bsky.social · 14/12/2023

"...The problem is, MOS doesn't tell us exactly how much of a push would do the trick. We think it would be more helpful if MOS used units that actually show how big that push would be, instead of just saying it's bigger or smaller." (6/n) Not bad!

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Jeremy Crenshaw @jrcrenshaw.bsky.social · 14/12/2023

Here is Bard's version: "The stability of a system, like your balance when standing on one leg, can be measured by how much you need to be pushed to lose it. This measurement, called the Margin of Stability (MOS), is bigger when you're harder to knock over (like a gymnast!)..." (5/n)

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Jeremy Crenshaw @jrcrenshaw.bsky.social · 14/12/2023

"...We suggest that stability margins may have more biomechanical meaning, utility, and perhaps validity if they are expressed in units that estimate that perturbation magnitude, as opposed to units that are only proportional to it." (4/n)

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Jeremy Crenshaw @jrcrenshaw.bsky.social · 14/12/2023

"...A limitation of the MOS is that, when expressed as a distance, it does not directly estimate the kinetic characteristics of that destabilizing perturbation...." (3/n)

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Jeremy Crenshaw @jrcrenshaw.bsky.social · 14/12/2023

Edit this paragraph to be at an 8th grade reading level: "The magnitude of the MOS is proportional to the perturbation magnitude needed to change stability states, assuming similar balance-reaction capabilities across participants (Hof et al., 2005)..." (2/n)

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Jeremy Crenshaw @jrcrenshaw.bsky.social · 14/12/2023

That is some next-level precision on reading level. Maybe this is something AI could be used for? I just tried it for a paragraph from one of my papers: (1/n)

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Jeremy Crenshaw @jrcrenshaw.bsky.social · 18/10/2023

My department is hiring! Continuing track position to teach undergraduate human anatomy and physiology, exercise physiology, and other physiology courses. careers.udel.edu/cw/en-us/job...

careers.udel.edu

University of Delaware - Details - Assistant Professor, Kinesiology and Applied Physiology (Continui...

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Jeremy Crenshaw @jrcrenshaw.bsky.social · 13/10/2023

The best choice of stability margin expression is dependent upon your study design and how you choose to interpret that margin. We will justify those choices in our future publications! (5/n)

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Jeremy Crenshaw @jrcrenshaw.bsky.social · 13/10/2023

Study conclusions can change w/ different margin expressions. If you are interpreting the margin as the perturbation size needed to change stability states, why not express it as an impulse? If you are comparing margins across people, perhaps the scaled impulse is best (4/n)

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Jeremy Crenshaw @jrcrenshaw.bsky.social · 13/10/2023

We examined the relationships between stability margins & body size, & we compared the margins of adults & children. Unlike other expressions, the scaled impulse did not hold significant relationships with body size or significant differences between children & adults. (3/n)

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Jeremy Crenshaw @jrcrenshaw.bsky.social · 13/10/2023

Yet another analysis motivated from our study of children--a group w/ substantial variability in size! Here, we assessed stability margins in children & adults. We expressed margins as a distance, impulse, change in velocity, & scaled impulse value. (2/n)

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Jeremy Crenshaw @jrcrenshaw.bsky.social · 13/10/2023

New paper from Nancy Nguyen! "How should the margin of stability during walking be expressed to account for body size?" t.co/NrpawyNqaJ (1/n)

t.co

Redirecting

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Jeremy Crenshaw @jrcrenshaw.bsky.social · 01/10/2023

...and if anyone has tips on how to do a threaded post here, let me know! Thanks

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Jeremy Crenshaw @jrcrenshaw.bsky.social · 01/10/2023

So, if the movement goal is undefined or variable, and/or if you want to express stability margins relative to anatomy, consider this approach.

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Jeremy Crenshaw @jrcrenshaw.bsky.social · 01/10/2023

In this paper, Michael showed that the pelvis-oriented stability margins were less affected by an exaggerated deviation in straight walking trajectory. He also showed that, during straight walking, the margins will differ from those coordinated in a lab coordinate system.

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Jeremy Crenshaw @jrcrenshaw.bsky.social · 01/10/2023

So, expressing stability margins relative to the pelvis was our answer! Doing so also has the advantage of expressing margins relative to hip anatomy. Balance-recover strategies and the consequences of a fall are affected by the direction relative to pelvis & hips.

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Jeremy Crenshaw @jrcrenshaw.bsky.social · 01/10/2023

2nd observation: I saw an instructional rehab session run by PT program in which a standing person w/ chronic stroke attempted to keep a balloon in the air by batting it. I wondered how we would calculate stability margins during tasks with a changing movement goal.

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Jeremy Crenshaw @jrcrenshaw.bsky.social · 01/10/2023

Were they unstable or distracted? Regardless, the steps following the deviation were along a corrected path not parallel w/ the instructed direction & lab coordinate system. Lateral stability measures would show a bias from that mismatch of instructed & observed trajectories.

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Jeremy Crenshaw @jrcrenshaw.bsky.social · 01/10/2023

The idea for this paper came from a couple of observations: 1) In our study of walking in children w/ & w/o CP, we noticed some children deviating slightly f/ the instructed, straight path. (these were omitted f/ the paper)

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Jeremy Crenshaw @jrcrenshaw.bsky.social · 01/10/2023

In this paper, we introduce stability margins expressed relative to the pelvis orientation.

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Jeremy Crenshaw @jrcrenshaw.bsky.social · 01/10/2023

New paper from Michael Christensen w/ @jamesbtracy.bsky.social "A pelvis-oriented margin of stability is robust against deviations in walking direction" authors.elsevier.com/c/1hraf4-6-e...

authors.elsevier.com

Client Request ErrorScienceDirect

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