Men ( N = 40 ; mean age SD , 38 9.14 y ) with diagnosed degenerative lumbar disease at L5-S1 were randomly divided into 2 groups : a treatment group ( TG ) ( n = 20 ; mean age SD , 39 9.12 y ) and a control group ( CG ) ( n = 20 ; mean age SD , 37 9.31 y ) .