No one mentioning GH causing swelling of all internal tissues? I thought that was the generally accepted understanding of the cause of Palumboism.
Palumboism wasn't splitting of the abs specifically. It was also shrinking arms etc. Most probably feel Pamboism has to do with age and especially with insulin resistance, with the body rebeling on multiple fronts.
Tearing of the abs and/or widening of the linea alba takes a lot of pressure - like in extreme volumes of food combined with heavy lifting. Many pregnant women recover their former waistline pretty well whereas some don't, they get diastasis recti. A few get surgery, a tummy tuck or hernia surgery. Genetics plays a part like with everything.
GH by itself doesn't tear your abs but it doesn't help combined with the food and lifting. But even steroids can expand your waistline temporarily through a few mechanisms. Anyone who has juiced extensively knows what I'm talking about, especially with orals. Insulin and GH can cause insulin resistance and increased VAT. And so on.
GH is an amazing hormone but if megadosed I think it can backfire terribly as far as health goes. I can think of many examples. High dosed GH can be amazing for a short while, long term, no.