The Force-Velocity Relationship | Meaning and Implications (Updated)

[@LaPtiteAnglaise]

FHP. In my humble opinion - you are one of the best sources of delivering complex concepts in accessible, clear, jargon free terminology. Thank you.

[@FlowHighPerformance1]

Glad to hear it, I definitely try to make these concepts clear and easy to understand 👍

[@MirthfulSpiritofHeavyRealm]

Excellent video, perfectly cleared this up! Thank you!

[@FlowHighPerformance1]

no problem

[@psjfree9974]

thanks man ! watching you from the middle east , Jordan university , can't comment on this video ! Islam taught me to salute who teaches me ! big thanks !

[@FlowHighPerformance1]

no problem 👍

[@cmmiguelx12]

2:34 you cant press it back up cause you'd have to put more strengh than weight of the bar, if you put less strengh the force of gravity will push it against you, it doesnt mean you're producing more power. If tha bar is static youre producing the same amount of force as the object, if youre lifting youre producing more and if its going down youre producing less. This has nothing to do with velocity/type of contraction

[@cmmiguelx12]

2:53 nooo when force decreases velocity increases because youre not resisting the weight of the object

[@nene1852]

Thank u!!! Iv hade a terible time understanding the eccentrick phase with force velocity you uave helped so much

[@FlowHighPerformance1]

no problem 👍

[@geethateacher-to1mn]

Help me bro

[@geethateacher-to1mn]

Explain bro

[@mosesbygate-smith2750]

I assume you mean it's lower force production during dynamic concentric movement compared to the force production capabilities during eccentric muscle actions? All portions of the force velocity curve are all technically still high force when considering GRF during sprinting and unresisted jumping. Just trying to wrap my head around all of this, your explanation clarified a few things for me!

[@FlowHighPerformance1]

Since making this video I have learned more about this concept and disagree with some aspects of it. Like you mentioned, this still applies to dynamic concentric and eccentric muscle actions, as seen during traditional resistance training. However, when it comes to athletic movements like sprinting and jumping, this concept goes out the window. Some of he highest GRF's seen are during completely unloaded movements like sprints and plyos

[@zoddnosferatu2126]

Thx even though i watch this to add reference for my physiology learning about muscle

[@FlowHighPerformance1]

No problem 👍

[@Angieraquell]

WOOOOW I literally had the "ah-ha!" moment...thank you so much!!!

[@FlowHighPerformance1]

No problem 👍

[@antonmand3671]

Good video!👍

[@FlowHighPerformance1]

Glad you liked it 👍

[@louisreilly4792]

great video, thankyou. But what about isometric contraction?

[@FlowHighPerformance1]

Isometrics are right in the middle of the graph (at zero velocity)

[@markbisnauth3369]

Thanks!!!

[@FlowHighPerformance1]

No problem 👍

[@hendyounis5768]

If asked about the tension inside the muscle ,, do I use the same relation supposing force here to be same as tension in the muscle ???

[@FlowHighPerformance1]

No, this is purely for external force & velocity 👍

[@JamesCanDoIt]

How does the relationship relate to explosive pull-ups? What is the best way to train to improve the explosiveness of the pull-up? Because there is a decceleration at the eccentric part. And load is hard to make less because its your bodyweight. Thanks.

[@FlowHighPerformance1]

You can always use a resistance band to lighten the load 👍

[@JamesCanDoIt]

@@FlowHighPerformance1 okay that makes sense. Does strength training so, weighted pull-ups contribute to the removing the bands in long-term? What i mean is the more strength u gain in the pull-up, the less force it takes to move your bodyweight from A to B. And this would eventually increase the speed overtime because the force (your bodyweight) will be easier than before. Is that correct? Im not native english speaker so im not sure if u understand what i mean. Anyways i will look into resistance bands

[@FlowHighPerformance1]

@@JamesCanDoIt yes that makes sense 👍

[@millerfamilyfitness84]

What about after 90 degrees? Is it not the same eccentric after 90 because the muscle is maximally lengthened?

[@FlowHighPerformance1]

After 90 degrees of what?

[@athletic_doc]

Dont you produce more force on a sprint or a max jump than on a max squat? This curve makes intuitive sense, but I feel like force plate data contradicts this with the actual values. Is it really referring more towards mechanical tension vs velocity instead of force vs velocity?

[@FlowHighPerformance1]

Yes, I totally agree. Since making this video, I have come to the same realisation. The force-velocity curve only really applies to traditional resistance training. It doesn't really make sense when it comes to athletic movements like jumping and sprinting 👍

[@athletic_doc]

@@FlowHighPerformance1​​⁠ okay, after doing some digging, it seems like I was wrong. Peak ground reaction forces in a heavy squat are higher (even around 3500N in one study) than in a standing CMJ (seems like around 2000N usually). However, this was not the same subjects so it varies, and of course a max approach vertical jump will have higher vGRF and if you look at the Kirby study, it could be reasonably inferred that a max vertical jump could be higher or as high as a heavy squat or clean. And the heavy power clean or heavy jump squat has even higher peak forces than the heavy squat when compared between the same subjects. Obviously peak power is going to be lower in a squat compared to a power clean or jump squat or any vertical jump. When it comes to sprinting, it’s been reported that sprinters traveling at 11.7 m/s experience forces almost 5x bodyweight, which would put that at around 1000N, so well below what any squat would produce. Hope this helps! References: “Model for progression of strength, power, and speed training”-Kirby et al. “The Optimal Back Squat Load for Potential Osteogenesis”- Ebben et al. “GROUND REACTION FORCES DURING COMPETITIVE TRACK EVENTS: A MOTION BASED ASSESSMENT METHOD” -Udofa et al.

[@Tom-ny3yc]

Its confusing because it ignores the factor of gravity. It is not a controlled experiment. How can they say this is purely the mechanics of the muscle fibres when they have not taken away gravity?

[@FlowHighPerformance1]

Yes, it doesn't consider the acceleration component of the equation. I have come to realise that this idea is not really applicable to many athletic movements 👍

[@youtubecomenter6014]

How is velocity measured? By the rep speed/time taken to complete a rep?

[@FlowHighPerformance1]

usually rep speed. but both ways are effective at estimating velocity 👍