City-Data Forum impulse of the bodybuilder repping big weights (power, physics)
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07-23-2012, 04:25 PM
 2 posts, read 1,150 times Reputation: 10

Wayne

Last edited by waynexk8; 07-23-2012 at 04:35 PM..

07-23-2012, 04:28 PM
 2 posts, read 1,150 times Reputation: 10
Bodybuilder 1, lifts 80 pounds {80% or his 1RM, Repetition Maximum} up 600mm in 3 seconds, and down 600mm in 3 seconds, 1 time, one repetition that takes 6 seconds, distance moved in all = 1200mm.

Bodybuilder 2, lifts 80 pounds {80% or his 1RM, Repetition Maximum} up 600mm in .5 of a second, and down 600mm in .5 of a second, 6 times, 6 repetitions that take 6 seconds, distance moved in all = 7200mm.

Which bodybuilder has the most/higher impulse, and why.
I say the faster lifter, reasons follow, some on the physics forum says they are both the same.

More power use,

Far more energy used,

When using 80% of your 1RM, you will fail roughly 50% faster lifting faster, thus in my opinion you must be using more impulse per unit of time,

I bought an EMG, and it states the average muscle activation {muscle force} is higher on the fast,

More distance is move with the faster,

For every reaction there is an opposite reaction, thus if the faster lifter is using, or should I say trying to use 100 pounds of force for the positive, and just under 80 for the negative, and maybe there will be 120 pounds of force on his muscles in the transition from negative to positive, the tension thus impulse will be higher. The acceleration a of the weight is directly proportional to the net force and proportional to the mass. F = ma, so more full acceleration for .5 of a second, you HAVE to use more force, I am not talking about the time before acceleration, or after acceleration. If I use 10N of force for .5 of a second, and you use 3N of force for .5 of a second, I have used more force, and more impulse !!! But then again we both have to decelerate for the transitions.
I have now ordered a force plate.

Wayne

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