I think they are basically doing the same thing.
One increases internal pressure directly (clamping).
One increases internal pressure RELATIVE to external pressure (pumping). That is to say, internal pressure remains the same, while external pressure decreases…resulting in a relative increase of internal pressure.
The limiting factor of pumping is the relative change of pressures can cause fluid migration and bruising.
The limiting factor of clamping is the ability of the blood vessels to withstand the increased pressures.
I am starting to think that the limiting factors of pumping aren’t critical. I am starting to really believe that EFFECTIVE pumping should be done well below vacuum levels that will produce negative effects on fluid migration and bruising.
As a matter of fact, I think all pe MUST be done at levels safely below tissue damaging force/time levels.
If a method needs you to go dangerously close to tissue damaging levels of force/time to be effective…it should be abandoned!
I think clamping is one of those methods that in order to be effective, you don’t have a large safety margin.
I don’t advocate abandoning clamping, but I do put it in the catagory of one that should be done with real caution.
In the past year, many of the injuries that have popped up on Thunders’ seem to have a clamping history involved.