Caffeine has been reported to alter perceptions of exertion, muscle pain, and mood, yet the majority of existing data were obtained in resting volunteers or during steady-state exercise.
This is essential, because all exposure sources for BPA have not yet been identified, and existing data suggest that non-oral exposures may be significant (Gies et al. 2009; Stahlhut et al. 2009).
Yet, a careful analysis of the existing data is warranted.
Nevertheless, no clear interpretation of existing data has been formulated yet in terms of an alternating-access proton transport mechanism, which is a necessary condition for the transporter to harness the energy stored in the transmembrane electrochemical gradient.
While the survey does not yet ask about trans identities among high schoolers, existing data demonstrate that their situation is even worse.
Existing data from the few studies of hybrid behavioural sterility do not yet allow for conclusions to be drawn about the relative frequencies of the three types.
The value of the present model does not lie merely in explaining existing data, but also in its generality, which permits to make predictions about yet unobserved behavior.
