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>And I once heard a story, not sure how true it is, that someone put the defrib pads over the thigh and on activation the muscle contract so violently that breaks the bone.

I'm skeptical of this.

for the Americans out here: 30 Kg is ~66lbs 1 meter is about 3 feet

If an adult male (about 150 lbs) jumps off of a kitchen counter (about 3 feet) - each leg will absorb 75 lbs from 3 feet. I have done this many times and even my thin feet bones held the force. I'm pretty sure my thighs (our strongest bones) would be just fine.




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