I'm not sure I follow you. You don't have to post more, but I am still interested in your research of this. I've never heard any arguments suggesting two strength training routines per day is better.
from the hst forum
Having the liberty to train twice per day and/or everyday opens up the possibility to significantly increase training volume.
As long as a "highly conditioned" person stays within his/her limits of exercise tolerance, doing more generally means better gains. I don't mean more fatigue, I mean more reps with a given load... Sounds like one in the same but it isn't really. To understand, consider the "effort" (A.K.A. CNS activation, or even "intensity" by its incorrect HIT terminology) it requires to do the 1st as compared to the last rep of your 10 rep max. The tension produced on the tissue doesn't change from the 1st rep to the last. The only thing that changes is the amount of CNS activiation required to contract the muscle under load.
So, more reps doesn't necessarily mean more fatigue if you can get enough rest in between sets. To get more and more rest, simply do 2 workouts spread out by several hours. Hence, the value of training twice per day.
Another advantage is being able to do more volume per bodypart during one session. You can also split the body up into 2 halves and train half in the AM and the other half in the PM. This essentially allows you to double the amount of volume per session per bodypart.
This also applies to cardio.
It may sound counterproductive but it isn't. Just consuming more food will create a more anabolic environment (more insulin, more leptin, more test, more GH), and the additional exercise also enhances this by increasing IGF-1, and protein synthesis rates in tissues. (yes, cardio increases protein synthesis in those muscle you are using)
The additional exercise will also lower your average glycogen levels and increase your insulin sensitivity at the same time, in addition you will get some upregulation of lipolytic enzymes. All of this makes those additional calories that you are eating less lipogenic.