There doesn't seem to be a lot of scientific foundation for it at the moment but there is a clinical trial on it.
There is however, one pilot study paper on the effects of 2 physiotherapy programs on pain perception, muscular flexibility, and illness impact (Valencia et al. 2009). The comparison between kinesiotherapy and active muscular stretching with ...
There doesn't appear to be a lot of actual scientific research on the subject, but you can follow a paper trail for a while:
The Daily Telegraph (an English newspaper) has an article on the subject, and references two people:
Professor M Jesel
The article also states:
But in recent years, the University of Strasbourg has taken up the ...
As a continence and pelvic pain physiotherapist pelvic floor muscle tightness is actually an assessment of increased tone or muscle overactivity. Palpation is digital and sides are compared as are each individual muscle within the pelvic floor. Tightness/increased tone/overactivity will often manifest as trigger points or areas of pain or discomfort.
Trying to combine physiotherapy with patching sounds like a parenting nightmare. As the AAO says:
Persuading your child to wear a patch can be a challenge, especially if the vision in the child’s amblyopic eye is very poor and the child is objecting strongly.
They go on to say:
Unfortunately this is an area of treatment where there is no “quick fix” ...