Topic: Snatch Velocity/ Intensity Study

[Paul LaDuke]

I thought a few of you might find my snatch analysis study interesting to look at.  I took video from the side of my snatch of 165#, 185#, 195#, 205#, 210# and 215#.   I set a new PR of 210# during the session and made a try at 215#.  The 215# snatch was missed by a hair but I know I can snatch it when I try it again.  For that reason, I report 215# as my max although not official.  

I am 175cm tall and I weighed out of the session at 88.5kg.

165# Snatch Analysis (77% of Max)
·   Height of Pull = 125cm in 1.13 sec
·   Average Velocity = 1.1 m/s
·   Peak Velocity = 1.97m/s @ 84cm height

185# Snatch Analysis (86% of Max)
·   Height of Pull = 129cm in 1.07 sec
·   Average Velocity = 1.20 m/s
·   Peak Velocity = 2.13m/s @ 105cm height

195# Snatch Analysis (91% of Max)
·   Height of Pull = 120cm in 1.07 sec
·   Average Velocity = 1.13 m/s
·   Peak Velocity = 2.09m/s @ 90cm

205# Snatch Analysis (95% of Max)
·   Height of Pull = 123cm in 1.07 sec
·   Average Velocity = 1.15 m/s
·   Peak Velocity = 2.08m/s @ 95cm

210# Snatch Analysis (98% of Max)
·   Height of Pull = 130cm in 1.1 sec
·   Average Velocity = 1.18 m/s
·   Peak Velocity = 2.47m/s @ 94 cm

215# Snatch Analysis (100% of Max)
·   Height of Pull = 123cm in 1.04 sec
·   Average Velocity = 1.19 m/s
·   Peak Velocity = 2.13 m/s @ 90cm


The video was analyzed using Motion Analysis Tools that can be downloaded for free here.  The software is limited to video on .avi or .mpg format.

[Jim Hooper]

Very cool software Paul.  Thanks for showing where to find it.  BTW, can you tell me if there is a way to save a project/file?  I hit the save button already on one but nothing happened, and there's no save option under the File drop-down.

I used the disc diameter (45 cm) to set the distance scale -- is that what you are doing, or is there a better reference to use?

BTW, I already figured out Dimas's peak bar velocity on a snatch was 1.57 m/s, so you need to pick up the pace . . . ;-)  I'm about to do it on Sagir, but am a little afraid my computer will blow up, or give me an error message saying that anything that fast simply does not compute, does not compute, does not compute . . . .

[Jim Storch]

Paul,

Good stuff!

[Paul LaDuke]

Jim (Hooper),

I use the 45cm plate too.  One caveat to this analysis is that the video camera must be on a tripod so that it is a fixed point.  Otherwise the calculations will be off.  It would be interesting to see this information from other lifters just to compare.  I have tried to save the output with no luck either.  I guess I will just need to print it and scan it back into Word or something.  I have calculated the bar velocity by setting a distance marker on the end of the bar on every other frame.  It is very interesting to see the changes in bar velocity at a sampling rate of 15 x per second.  You could do it every frame for the 2nd pull to watch the changes there also.  I have found this software to be a lot of fun.  I will have to do some digging into the formulas, but you should be able to calculate a power output since you know the bar load and velocity.  

Jim (Storch),

Thanks, it was an interesting study.  I have gotten the study down to a science on the software and will post other elite lifters when I can.  The problem is we are getting our home ready to sell, so free time is at a minimum.

[Jim Storch]

Is it possible to track your speed under the bar?

[Shaun Le Conte]

BTW, I already figured out Dimas's peak bar velocity on a snatch was 1.57 m/s, so you need to pick up the pace . . . ;-)  I'm about to do it on Sagir, but am a little afraid my computer will blow up, or give me an error message saying that anything that fast simply does not compute, does not compute, does not compute . . . .

I'd actually expect the world's top lifters to have relatively lower peak bar velocity than most of us, due to their superior speed in transitioning under the bar and ability to make lifts with minimal margin for error. So with Sagir the bar isn't moving all that fast, it's Sagir himself that's lightning quick! Phwoosh!

[Carl Darby]

I'll have to dust them off, but I have excel spreadsheets that take information about bar height per frame and translate it into graphs of bar height, velocity, acceleration, power input, force, and rate of force development.

I got tired of using it because the only way I could get the raw data was to measure the height of the bar on the monitor with a ruler--very tedius. I remember getting some interesting results though. If you tracked the bar height using the end of the bar, you could see the effect of the bar's oscilation when catching it in a clean reflected in the height graph.

Like I said, I'll have to dust them off and adapt them to the data this software generates, but I'll share with anyone that's interested.

[Paul LaDuke]

Jim Storch,

I guess you could track your speed under the bar.  I have never even thought about that.  That would be a very interesting study.  The tough thing would be to track the same exact location as it changes from frame to frame.  My initial thought would be to track the ear to get a good indication of the speed under the bar.   Does anyone have a better idea of what to track to get your speed under the bar?  Has anyone done something similar before?