Peter Weyand
@Dr_Weyand
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Professor and Chair, Performance Geek, All Things Human Performance: Past, Present, Future, Texas Christian University, TX
DFW, Texas
Joined July 2017
RT @KenClarkSpeed: thanks @RaesTake! it was a fun #TBT to look at those videos from a decade ago... a lot of great days on the track and i…
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@sprintcoachSWE @Scott_Damman @CodyBidlow It is essentially the same information as F-ground/m. And, if you have tc, tair, and gravity, you already have the average stance phase vertical accel - of course the pattern vs. time matters too, hence my data quality comment.
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@sprintcoachSWE @Scott_Damman @CodyBidlow Because F and a are directly linked regardless of axis, and F is quite important for sprint performance (F/m), A-z clearly is important mechanically. Whether an A-z data stream has practical coaching value would depend on: 1) data quality, and 2) the other data available imo
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@pjvazel @KinesKing @FredrikGson1973 @stevemagness @japplphysiol @Joe_Eisenmann @PfaffSC @usainbolt Interesting data PJ. All data points single races I think? Do you have R^2 values for each plot?
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Yes, indeed. Accel velocity - propulsive force relationship: Good and well worth assessing. but please present for what it IS, and not something it is NOT.
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Thanks for the input PJ - the start/finish trade-offs are scientifically quite interesting imo.
@Dr_Weyand @lahti_johan The main problem from the coaching POV is the application to sprint training in athletics, as improving left part of the curve (start & accel, by being specific to the first 3 impulses on the track) may have negative implications on the right of the curve (top speed)
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@lahti_johan Johan, per recent tweets, I suggest reviewing the researchers & important citations from Hill forward that established muscle mechanical activity during running, and particularly sprint running, as a high force/low velocity activity.
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FVP sprint model: 1) Presented using Hill muscle work 2) Hill muscle terms for variable names 3) Justified w/ exercises that ARE valid Hill apps BUT 4) whole-body (V run & F horiz-net) & muscle F & V are: a) incorrect, and b) backward vs. scientific reality.
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Hi Johan Per slide of yesterday: The origins, justification and terminology of the FVP sprint model - as the authors presented it, is an extension of Hill's original isolated muscle work & the valid exercise applications that followed prior to misapplication to sprinting
Hey Peter, im curious why this would be classified as a misrepresentation of muscles if its not the focus? The fv aims to depict external net forces. Then one can focus on what are the limiting factors of those net forces. Musculoskeletal studies have a clear divide between muscles that produce vertical and horizontal impulse. I wouldnt say its not important info to do fvp myself, and never protest if you add more data when interpreting it!:) such as vertival and mediolateral
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Hi Jonas – You can easily check PubMed or Google scholar for both basic science & practical studies. Important for both science & practice to know: Does FVP model represent science of sprinting as FVP authors have claimed?
@Dr_Weyand @ALTIS @dr_jump_uk @pjvazel @lancebrooks_phd @coachgambetta @hiitscience @1080motion @sportsxacademy My main question is, now that so much work has been done in horizontal force profiling, has anyone looked into the findings, or is it all poo pooed because the original methods are seen as flawed? @dr_jump_uk @lahti_johan
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Origins of FVP method for sprint running, presented in terms of Hill’s isolated muscle FV properties. Application or Misapplication? @ALTIS @dr_jump_uk @pjvazel @lancebrooks_phd @coachgambetta @hiitscience @1080motion @sportsxacademy
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@LoreofRunning1 @CoachKenVick @Gareth_Sandford @PaulBLaursen @mart1buch Thank you, @ProfTimNoakes good to know. As you might imagine - no small amount of sweat equity in those studies. You are certainly welcome to reach out as helpful to your writing efforts. Not sure which figure you seek from @CoachKenVick so I will let him respond.
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Muscle FVP considerations for sprinting: WHY BOTHER? Get it RIGHT → Understanding → better interventions Get it WRONG → Confusing mess @ALTIS @dr_jump_uk @pjvazel @lancebrooks_phd @sciofmultispeed @coachgambetta @hiitscience @1080motion @sportsxacademy @athleticlab
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In vivo F-V for elbow flexion by Hill mentee DR Wilkie '49 Note Wilkie’s conclusion: In vivo F-V mechanics ≈ Hill’s iso. muscle mechanics @ALTIS @dr_jump_uk @pjvazel @lancebrooks_phd @sciofmultispeed @JPhysiol @coachgambetta @hiitscience @1080motion @sportsxacademy
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Tributes to the life and career of Ralph Mann have come forth from many people and sources. The story below is a nice one from Deseret News of St. Lake City, UT.
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@Tier1athlete @Gareth_Sandford & @hiitscience specialize in just this so I encourage you to check into their papers and other materials. Our speed-endurance papers may be of some help also:
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