This is an older article, but had some good info in it. The whoile article can be found at :
What I found interesting was the testosterone level tests after 2 weeks. They are as follows:
The blood test results were good. Jim started with normal values for testosterone, estradiol, all hepatic function tests, and blood lipid profile. Immediately after the two week point, he had a follow-up test. Everything remained normal except for his blood testosterone, which had dropped from 429 ng/dL to 50 ng/dL (normal range is 240-830 ng/dL), and AST, ALT, and CPK values were elevated – however, this was to be expected and is not harmful, except that of course we would not wish the testosterone level to remain so low but to return to normal quickly.
So from what I am seeing, even 2 week cycles hit the HTPA hard..dispite what proponents of the short cycles say. IMO, if your gonna get shut down, might as well run the cycle for 8-12 weeks.