Although concentric and isometric contractions have been shown to produce a hypertrophic response, a majority of studies seem to show that eccentric actions have the greatest effect on muscle development. Specifically, lengthening exercise is associated with a more rapid rise in protein synthesis and greater increases in IGF-1 mRNA expression compared to shortening exercise. Moreover, isotonic and isokinetic training that does not include eccentric contractions result in less hypertrophy than those that include lengthening contractions.
Testosterone can be administered parenterally , but it has more irregular prolonged absorption time and greater activity in muscle in enanthate , undecanoate , or cypionate ester form. These derivatives are hydrolyzed to release free testosterone at the site of injection; absorption rate (and thus injection schedule) varies among different esters, but medical injections are normally done anywhere between semi-weekly to once every 12 weeks. A more frequent schedule may be desirable in order to maintain a more constant level of hormone in the system.  Injectable steroids are typically administered into the muscle, not into the vein, to avoid sudden changes in the amount of the drug in the bloodstream. In addition, because estered testosterone is dissolved in oil, intravenous injection has the potential to cause a dangerous embolism (clot) in the bloodstream.
My protein intake was always in excess of 2 grams per pound of bodyweight each day, and carbs were twice that. If you're thinking I got fatter than the WWF's Rikishi on this meal plan, you're wrong. My attitude was that because I was training so hard and using the drugs, everything I ate turned into muscle, and this belief proved true. I went from 210 at the start of the cycle to 232 at the end, with no loss in definition. I wasn't ripped by any means, but I was in pretty hard condition with veins popping out on the chest and front delts, and the abs visible but blurry. I've also seen dozens of other bodybuilders successfully employ the "gluttonous pig strategy" while on gear.