This morning I did deadlifts against bands for triples. I was on a lifting platform and basically stretched the bands across our lifting platforms across the in side of the Barbell and secured them in place with 100+lbs dumbbells. The bands I used were green and a roughly inch and half wide maybe alittle more.
My question… is there a formula or something that can roughly estimate how much pressure the bands add to the bar. I went up to 300lbs actually on bar and had to strap in so they had to quite a bit of force Just curious as to how much…
There isn’t a formula but at elitefts they did some calibration measurements using some special machine and have a chart based on their bands (the green and other jump bands are different than theirs and different tensions). So if you buy the elite bands you’ll know but I don’t think other companies have tested to give an exact poundage.
If they are the green jump stretch bands they are very similar to the EliteFTS Average bands. We’ve “estimated” that with our setup, there is approximately 180-220lbs of tension at the top. Obviously it varies as from lifter to lifter from differences in stance, pulling style (conventional vs sumo) and distance to lockout. It also depends on how taught the bands are to the platform.
The band tension increases linearly as the distance it is stretched. If you’re really motivated, you can use basic trigonometry and the Band Tension calibration guide on EliteFTS to get a more accurate number. However, even this would be a S.W.A.G. and personally I think there are too many variables to get an accurate result.
You could measure it by yourself if you have fishing scale with hook by hooking other part of the band to some solid and pull it as tight as it goes when you deadlift. Sure its not 100% accurate but that would be rough estimate in certain angle and distance.
Other way would be to hang that band on somewhere and keep adding weight till it looks and stretches to some distance than when you deadlift.
This is bromath and i have no idea will it work that way but somewhere to start i believe
If im wrong blame me from just waking up from my nap
All you need to do is yoke one weight, record the band length. Then, change the weight yolked and record the band length again. From that you calculate the change in band displacement, and you can get the Young’s modulus of the band normalized by the cross-sectional area of the band. Using that value you can assume locally linear elasticity of the band and compute the band tension for an arbitrary displacement of the band.
[quote]incog wrote:
I’ve measured band tension in the gym before.
All you need to do is yoke one weight, record the band length. Then, change the weight yolked and record the band length again. From that you calculate the change in band displacement, and you can get the Young’s modulus of the band normalized by the cross-sectional area of the band. Using that value you can assume locally linear elasticity of the band and compute the band tension for an arbitrary displacement of the band. [/quote]
[quote]incog wrote:
I’ve measured band tension in the gym before.
All you need to do is yoke one weight, record the band length. Then, change the weight yolked and record the band length again. From that you calculate the change in band displacement, and you can get the Young’s modulus of the band normalized by the cross-sectional area of the band. Using that value you can assume locally linear elasticity of the band and compute the band tension for an arbitrary displacement of the band. [/quote]
[quote]incog wrote:
I’ve measured band tension in the gym before.
All you need to do is yoke one weight, record the band length. Then, change the weight yolked and record the band length again. From that you calculate the change in band displacement, and you can get the Young’s modulus of the band normalized by the cross-sectional area of the band. Using that value you can assume locally linear elasticity of the band and compute the band tension for an arbitrary displacement of the band. [/quote]
[quote]incog wrote:
I’ve measured band tension in the gym before.
All you need to do is yoke one weight, record the band length. Then, change the weight yolked and record the band length again. From that you calculate the change in band displacement, and you can get the Young’s modulus of the band normalized by the cross-sectional area of the band. Using that value you can assume locally linear elasticity of the band and compute the band tension for an arbitrary displacement of the band. [/quote]
you smart or something?[/quote]
I lol’d, genuine lol.[/quote]
i just had a genuine chuckle myself. Solely because you stated genuine lol hahahah. Got me good you fucker.
Also to incog, seriously seemed like a really good idea, i wasnt trying to call u dumb, u actually sounded super smart haha. Was kinda a saarcastic compliment of sortS?
Stand on a bathroom scale holding the bar, record weight.
Repeat with band in place, added weight displayed = approx band tension (it’ll be slightly higher as the scales will raise you up slightly).
Kind of on topic question but does anyone notice a strength difference between the old jump stretch bands and the ones elitefts carry now? I’ve used both sets and i feel like the jump stretch added more weight.
My advice is to never measure the tension. I KNOW nobody here would ever do it, but I often hear how someone benched, pulled, or squatted whatever number including band tension. Well, that does not mean crap. Those numbers don’t translate to straight weight. If I bench 405 with 10 chains, I just write it in my journal as 405 with 10 chains, and I try to beat it next time around. One of the great things about accomodating resistance is that it takes numbers our of the equation so one can just focus on getting stronger. JMHO.
[quote]vdizenzo wrote:
My advice is to never measure the tension. I KNOW nobody here would ever do it, but I often hear how someone benched, pulled, or squatted whatever number including band tension. Well, that does not mean crap. Those numbers don’t translate to straight weight. If I bench 405 with 10 chains, I just write it in my journal as 405 with 10 chains, and I try to beat it next time around. One of the great things about accomodating resistance is that it takes numbers our of the equation so one can just focus on getting stronger. JMHO.[/quote]
I do that too. As long as you use the same thing, doesn’t really matter how much bands/chains add on. It matters if you put more bands/chains/weight on the bar.
For DE work, it might matter, but I don’t measure starting percentages on that because I’m not a very explosive person and can’t use that 50/55/60% + band equation.
Set the bar with the band at the top most position of the lift. Add another bar to the other end of the bands. Add weight until the 2nd bar gets to the level they are choked on the lift. The bar weight it takes to stretch the bands into the same position it would be during the lift is the amount of tension at the top of the lift.
