Noise-induced ABR threshold shifts.
Immediately after noise exposure (130 dB SPL for 1 h), the ABR threshold of the hydrogen-saturated saline and normal saline groups was 54 dB and 62 dB, respectively. The ABR was subsequently tested 14 days after noise exposure. The hydrogen-saturated saline group had less of an ABR threshold shift compared to the normal saline group, 3, 7, and 14 days after noise exposure. HS: hydrogen-saturated saline group; NS: normal saline group. **P<0.01: vs. NS; ##P<0.01: control vs. HS.