@P-Long
Dr. Brandeis,
Thank you for sharing the P-Long study and for your active presence in this community. I have a question that I believe is central to evaluating the biological plausibility of the protocol's length results.
The tunica albuginea is a dense fibrous structure composed primarily of Type I and III collagen with a tensile strength comparable to tendon tissue. In healthy men, it functions as a rigid hydraulic chamber — not a growing tissue. The existing literature on penile traction (including the RestoreX RCT you cite) demonstrates gains specifically in the context of Peyronie's disease, where pathological fibrotic plaques respond differently to mechanical load than normal tunica.
My question is: what is the proposed mechanism by which the P-Long protocol induces measurable, permanent elongation of the tunica albuginea in anatomically normal men?
Specifically:
1. Does PRP act directly on tunica fibroblasts, and if so, how do you account for the pro-fibrotic effects of TGF-β1 — a major PRP component — which could theoretically increase tunica stiffness rather than compliance?
2. Were any histological or imaging assessments (e.g., ultrasound elastography) performed to document structural changes in the tunica pre- and post-treatment?
3. Given that erect length measurements were taken via at-home photography without observer blinding, how was measurement variability controlled — particularly the well-documented effect of optimization bias over repeated self-measurement sessions?
The study itself acknowledges the absence of a control group and the non-standard measurement methodology. Without a mechanistic explanation for tunica remodeling in healthy tissue, the length gains remain difficult to attribute to structural change rather than measurement variance or improved tumescence.
I would genuinely appreciate your thoughts on this, as it seems to be the key unanswered question in the literature.
Thank you.