The widely-circulated 'breasts accelerate up to 3G' figure traces only to a Tier 4 blog that states it as a general finding without an inline primary citation, unconfirmed at primary

A 2014 University College London student/researcher blog post states that "during the beginning of a running stride, the breasts are found to accelerate at up to 3 G." The blog presents this as a general biomechanical finding with no inline citation attached to the number; its reference list carries four papers — Brown, White, Brasher & Scurr (2013); Heminsley (2013); Scurr, White & Hedger (2010); and Zhou J., Yu W. & Ng S-P., "Studies of three-dimensional trajectories of breast movement for better bra design," Textile Research Journal 82(3):242–254 (2012) — with the Zhou et al. paper tied (via an image caption, "The breast in three dimensions. Zhou et al 2012.") to 3D-trajectory work, not to the 3G figure. The blog is thus the only source found this session that pairs a specific numeric g-value with breast acceleration during running, and per sources.md's sourcing floor, a Tier 4 source cannot carry a quantitative claim on its own — it is a pointer to a better source, not evidence, and here it does not even name which of its four references the number came from.

No primary confirming the 3G number was reachable this session: the Zhou et al. Textile Research Journal article page, a related open-access companion (Journal of Fiber Bioengineering & Informatics 5:2, 2012), and ResearchGate all returned blocked or non-PDF responses. Two related Portsmouth-group papers that discuss breast acceleration quantitatively — Scurr, White & Hedger (2010) and Haake, Milligan & Scurr (2013) — were located but their retrieved abstracts define acceleration as a measured variable without stating its peak value in g in the text obtained.

Taken at face value against Formula 1's own documented peak cornering load of "over 5G", this 3G figure would actually be lower, not higher — a tension the popular framing in claim-wakefield-scurr-attributed-f1-breast-acceleration-comparison does not address. Neither number is solid enough to resolve the comparison either way: this one is unverified at the primary-source level, and it is unclear which F1 loading regime any given popular comparison intends.