I may be wrong but I believe this is an outdated theory brought about by the belief that non aromatising drugs like
anavar,
winstrol and
primo did not cause a negative feedback at the hypothalmus and therefore did not shut down natural
test production. It is true that the above drugs would have less of a supressing effect than strong androgens like
dianabol and
test but at the dosages used by todays bodybuilders these drugs do still supress natural
test. In recent years other hormones other than estrogen have been found to have a negative effect on
test production namely high androgens,
DHT, prolactin and progesterone. There are BBs that do use drugs to bridge, I have no experience of this so can't comment but personally believe that to get natural
test levels back up one has to keep testicles from atrophying excessively by either using small doses of
HCG for a couple of days per week during the cycle or by using say 500ius daily for 10-14 days at the end of a course to make the testicles more responsive to endogenous LH and then using
clomid or nolvodex for a 4 week period to restore the HPTA. Hopefully others with more experience may shed a bit of light on the theory of bridging.
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