BRoderick Chavez has data on the contrary to this. He has trained Olympic competitors as well as Mr O competitions.
His basis is that if you have exogenous test, your body senses this and shuts down. With non test base, it does not sense the test so it does not immediately shut down. The eventual shut down occurs through feedback mechanisms and this can take up to 7-9 weeks to shut down. This allows Olympian competitors to take short cycles and not needing PCT to start the test because it never shut down. PCT drugs will cause a positive test result.
He has “studies” based on a limited population that he did.
When you think about it, it sounds reasonable. I used to be under the thinking that there was no significant difference until I ran across this.
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