All remains relative to the time and load. More importantly to the strain rate.
If hanger loads several kilos at once there night be damage which is referred as Micro traumas.
Micro traumas occurring because of the strain rate. If starting low and going increments to the target load with time, there will be less.
The idea of Micro traumas needed for tissue lengthening is false in the first place.
It has been adopted from the muscle building environment
Where the tissue grows stronger after such an incidents.
As far as it goes for lengthening procedures of any connective tissue as in case of tunica albuginea, such a concept would be counter productive.There is only one concept of lengthening such a tissue no the matter what the actual workout is.
There has to be a threshold strain reached during the workout for triggering the growth process which then produce permanent results. .
Had not reached stimulus enough there will be no gains no matter what. Including NIR.For certain level and Group of individuals the force applied can trigger the growth processes by itself.
But once adapted or for some at the start already the displacement during the workout becomes crucial.
The whole meaning for using therapeutic temperature with ultrasound is to allow greater strain with lesser Micro traumas other wise unavoidable with such a displacement.These techniques combined could be very productive.
For the the Heating purposes I would’t recommend these pads.
For that US and FIR remain better and safer choices.As OP suggest NIR pads should be used for supporting and maintaining the growth responses.
So far my results appear to line up with what Kyrpa states above. I have both FIR and NIR pads. I used the FIR pad while pumping for 6 months with good results (0.5” girth gained). Reading this thread, I decided to test a NIR pad and see if that worked better.
My experience was that the NIR pad wrapped around the pump tube provided less expansion than the FIR pad keeping all other aspects of my routine the same. My sense was that the NIR pad was not heating my penis as well and therefore my expansion was less.
I have since switched back to the the FIR pad for my first 20 minute pump set with the digital temp control set to 138F. For my 2nd 15-20 minute set, I use the NIR pad. This way I get the excellent expansion from the FIR heat and then the excellent healing and (hopefully) growth response.