Abstract
•We extend a protocol with a “satiation” and fullness stage to estimate gut sensitivity.•Our participants had foreknowledge of the fullness stage, allowing longitudinal study.•The current study found less intake for satiation, and more for the fullness stage.•Participants had concern about the 2nd stage, possibly holding back during the 1st stage.•Future studies should consider using a dummy baseline followed by a real baseline.
Van Dyck et al. [8] developed a two-stage protocol to estimate interoceptive (gastric) sensitivity independently of stomach volume. They provided no foreknowledge of the second stage (reaching stomach fullness), following the initial stage (drinking until satiated), therefore preventing longitudinal research. The current study provided foreknowledge. Despite this, within-subject variation over time was found, with increases for satiation (p < 0.050) and% satiation (p < 0.000), and decreases regarding fullness (p < 0.000). Some participants expressed trepidation at baseline, hence foreknowledge may have encouraged avoidance of premature fullness. Future longitudinal studies should consider using one baseline to acclimatise, followed by a true baseline.