Table 4.

aVOR gain and latency responses during HIT testing

Head Impulse Test (HIT)
Diagnosis	Velocity gain pre (post)	Acceleration gain pre (post)	aVOR latency pre (post)
BVH
Ipsilesional	0.21 + 0.02 (*0.29 + 0.03)	0.19 ± 0.09 (0.20 ± 0.07)	28.7 ± 5.64 ms (*13.6 ± 6.9 ms)
Contralesional	0.51 + 0.03 (*0.68 + 0.03)	0.40 ± 0.11 (*0.62 ± 0.17)	19.4 ± 3.02 ms (*3.4 ± 1.15 ms)
NL
Left	1.00 ± 0.05	0.93 ± 0.08	5.40 ± 2.14 ms
Right	1.07 ± 0.04	1.05 ± 0.10	4.07 ± 2.85 ms
UVH 56
Ipsilesional	0.63 ± 0.21 (0.68 ± 0.06)	0.49 ± 0.12 (*0.64 ± 0.15)	14.6 ± 2.1 ms (*28.3 ± 4.2 ms)
Contralesional	1.03 ± 0.22 (1.05 ± 0.06)	1.11 ± 0.1 (1.06 ± 0.11)	5.86 ± 1.2 ms (*10.7 ± 1.9 ms)
UVH 58
Ipsilesional	0.30 ± 0.03 (*0.37 ± 0.04)	0.48 ± 0.8 (0.30 ± 0.07)	14.3 ± 3.8 ms (*17.3 ± 4.8 ms)
Contralesional	0.62 ± 0.05 (*0.73 ±0.04)	0.68 ± 0.22 (0.72 ±0.06)	14.58 ± 3.9 ms (*9.42 ± 3.9 ms)
NL
Left	1.05 ± 0.12	0.99 ± 0.16	4.36 ± 1.9 ms
Right	0.91 ± 0.16	0.92 ± 0.31	4.9 ± 1.3 ms

Mean ± 1 SD aVOR velocity gain, acceleration gain, and latency in milliseconds (ms) during passive head impulse testing (HIT). HIT used to identify peripheral aVOR function in the dark. Top scores in each cell represent initial (pre-vestibular physical therapy) testing. Parenthetical data in the same cell refers to testing 6 weeks post vestibular physical therapy. BVH- bilateral vestibular hypofunction; UVH- unilateral vestibular hypofunction;

^*p < 0.05.