I've posted this else where before:
Bridging with Anavar: Is it possible?
Similar to methandrostenolone, there are some individuals that suggest oxandrolone can be used in small doses to "bridge" between cycles. The theory that is proposed tries to argue that by taking a small dose of oxandrolone upon awakening, this will provide an anabolic "boost" to an individual's natural testosterone levels, help combat catabolism, all while supposedly not interferring with the recovery of the HPTA. When one looks at the evidence, it is apparent however that this theory is not based on any credible information.
The fact that oxandrolone can be suppressive to the HPTA even at small doses for several hours alone would prevent it from being useful during post cycle therapy (pct) or between full cycles. As stated by Sheffeild-Moore et al. in their study: "Total serum T concentrations were within normal physiological range on day 0 (449 ± 35 ng/dL) and day 3 (441 ± 44 ng/dL) of OX treatment. However, by day 5, total serum T concentrations were significantly reduced (282 ± 45 ng/dL; P < 0.05) below day 0 and day 3 values [emphasis mine]..."(3). This means that even at a dose of 15mg per day an individual will be shut down, thus nullifying any attempt at post cycle therapy (pct).
It is for this reason that running oxandrolone as an attempt to "bridge" between cycles will not aid in maintaining muscle mass during post cycle therapy (pct) while allowing your HPTA to recover.