The idea of trampling is hot. The visuals can be fantastic. It works both masochistically and psychologically. Yet somehow, whenever I try it, I struggle with it. I think that’s mostly because I’m afraid a rib is going to crack. I’ve got no natural intuition for the force they can take. It’s tough to relax into the moment when I’m picturing a trip to the ER and explaining why I’ve got heel marks all over my chest.
I suspect my fears are unwarranted when trampling is done properly. This article claims that a force of 3,300 Newtons gives a 25% chance of cracking a rib. That kind of force can be generated by a hard fast punch, but it’s a long way off the force exerted by the resting weight of a human. A 140lb domme would exert just 622 Newtons of force from standing on someone. Of course that’s only true when she’s stationary or when moving carefully. If she jumps then she’ll exert a very large force when she lands and rapidly decelerates. So if your domme wants to try that, I’d suggest telling her that Mr. Newton strongly recommends against it.
This fantastic trampling shot is from the twitter feed of Michelle Lacy. I love both the space she’s in and the bondage/trampling combo. If you’re interested in playing with her, she’s based in South Florida but does travel.
I suspect the equation should also include a factor for the area of the foot or shoe involved. In my limited experience, I find a high heal pressed into the webbing between the thumb and first finger to be frighteningly painful.
https://hypertextbook.com/facts/2003/JackGreen.shtml
You know I spent a bunch of time thinking about the particular scenario, because intuitively I thought the same thing. However, for the specific case of cracking a rib, I’m actually not sure the area does make a difference. At least on the limit.
Definitely when it comes to pain, then you’re absolutely right. Sharp pressure in a narrow spot is very intense. That’s all about squishy skin and squeezing nerves. I know exactly what you mean with that particular bit of webbing (http://www.femdom-resource.com/2017/11/21/ending-on-a-high/ )
Also, if the domme has soft shoes that can distribute pressure across multiple ribs, thus spreading the load across several bones, then that clearly makes a difference as well. But at the limit, with the pressure on just one rib, I’m not sure the area matters. At least with respect to breaking something. Imagine trying to bend an iron bar. Assuming the surface doesn’t deform, it doesn’t matter if you’re pressing across the entire width, or just at a narrow point. The bar itself distributes the force and you just need a certain amount to bend it, regardless of if it’s applied at a pin point or more broadly.
Although obviously I’m not a mechanical engineer or a doctor, so take all this with a pinch of salt :-). It is interesting to think about though.
-paltego
I did like the recommendation at the end of the cited article that if one has to choose between being trampled by elephants or women in high heals, one should choose the elephants. 🙂