It’s 40Hz not 40MHz. So 2400 rpm would be 40Hz
Just like of throw things out there for reading pleasure:
Developing tunable biomaterials that have the capacity to recreate the physical and biochemical characteristics of native extracellular matrices (ECMs) with spatial fidelity is important for a variety of biomedical, biological, and clinical applications. ...
www.ncbi.nlm.nih.gov
This is the lower end on the MHz to perform scanning without breaking down the collagen bonding, aka ultrasonic scanning for pregnancy.
However, if you're talking about collagen hydrolizing (gentle breakdown and reforming), you need to add both heat at around 138F and steady frequency between 0.3MHz to 10MHz for a dermal routin for about 30 minutes with direct contact with skin:
The nonablative radiofrequency is a procedure commonly used for the treatment of skin laxity from an increase in tissue temperature. The goal is to induce thermal damage to thus stimulate neocollagenesis in deep layers of the skin and subcutaneous tissue. However, ...
www.ncbi.nlm.nih.gov
Otherwise, quick burst of collagen breakdown in a few minutes at 40MHz or 44MHz, indirect contact, with gap and media up to 2cm. This is where the focus and not radial shockwave therapy comes in.
If you're using a home-base extracoporeal radial, even focused, shockwave therapy devices, it can range very low anywhere between 5Hz to as 60Hz, with
direct skin contact. This means absolutely no media (such as water and solid plexiglass) in between the skin and the transducing device. Yes, this has been discussed in length in the urological publications for nearly 10 years now. The debates has always been "low frequency and home base affordable" devices can do as good as "proven clinical high specs devices". The results? There were definitely medical results for the lower end spectrums. Here's an example of the publication in 2018:
I've been following these publications since the trial run going back as far as 2002, when they switched from ultrasonic through subcutaneous fat liquifaction (body slimming using ultrasonic devices) to isolated erectile dysfunction trial runs. I'm still connected to the symposia and the members that are deliberating on their findings.
But, do take the marketing ploys with a bucket of very harsh salts. Some sudden discoveries and publications will pull scam artists out of the woodworks to market devices of various promises to desperate people. This is why I become the voice of reason for the brotherhood. I'm not afraid to be a test subject and perform mods for the fun of it, but there are limits on what I want to waste money on. Just to show you what I mean about them running with a finding at low frequency:
Collagen is a force-bearing, hierarchical structural protein important to all connective tissue. In tendon collagen, high load even below macroscopic failure level creates mechanoradicals by homolytic bond scission, similar to polymers. The location and ...
www.ncbi.nlm.nih.gov
This is so called low frequency at 30Hz, but most manufacturer doesn't indicate the collagen bond must be directly influenced/applied after heating at 100C/212F. The application temperature is 138F based on facial tissue treatments discovered in the past 2 decades. So, to apply this, you need your water to be at 138F, that's practically scolding for your penis, and the device must be in contact with your penis even at 40Hz.