I wonder if he took anabolic steroids considering the first one made was around 9 years after his last competition?
Sorry, I couldn't help myself. 
Testosterone Propionate in 1940? Say it isn't so!
Kenyon AT, Knowlton K, Sandiford I, Koch FC, Lotwin,G (February 1940). "A comparative study of the metabolic effects of testosterone propionate in normal men and women and in eunuchoidism". Endocrinology 26 (1): 26–45. doi:10.1210/Endo-26-1-26.