Factors associated with dynamic balance in people with Persistent Postural Perceptual Dizziness (PPPD): a cross-sectional study using a virtual-reality Four Square Step Test.

The study measured people at one time point, so it cannot show whether anxiety, confidence or dizziness disability caused smaller head movement. It analysed 22 people with PPPD, and the authors say it may have been underpowered to detect correlations within each group. The virtual task was not fully randomised; the simplest scene was always done first, which may have affected learning or comfort. Head movement was measured from the headset, not from the feet, so reduced head range may not show exactly how someone stepped. Participants were told to move as fast as possible, which may have hidden balance differences that appear at slower or comfortable speeds. A single virtual exposure did not aim to provoke symptoms, so it does not show how repeated busy visual environments affect PPPD over time.

Funding was named as the Foundation for the National Institutes of Health and the Hearing Health Foundation. The supplied text gives no author conflict-of-interest declaration.

Do not conclude that people with PPPD have normal balance or that anxiety causes restricted head movement. The study found no group difference on a fast virtual step test, but it was cross-sectional, analysed 22 people with PPPD, and measured head motion rather than stepping.