Table 1.

Post-noise hypothermia TTM accelerates recovery of ABR thresholds to baseline.

Recovery		1 DPN			3 DPN			7 DPN			14 DPN			28 DPN
	kHz	M	SE		M	SE		M	SE		M	SE		M	SE
Noise – TTM	Ck	37.5	7.3	**	24.0	4.8	**	18.3	4.6	**	13.3	5.1		14.2	4.2
	2	35.8	6.0	**	16.0	5.6	*	13.3	4.8		10.8	4.2		9.2	4.0
	4	38.3	4.2	**	20.0	5.2	**	15.8	3.7	*	9.2	2.4		12.5	1.1
	8	46.7	3.3	**	33.0	6.8	**	35.8	7.2	**	30.8	5.8	**	35.8	5.2	**
	16	50.0	1.8	**	32.0	6.8	**	25.8	5.1	**	24.2	4.0	**	22.5	7.2	**
	24	45.8	3.0	**	15.0	6.3		8.3	5.6		10.0	6.1		7.5	5.0
	32	55.8	4.5	**	32.0	4.1	**	15.0	5.8		8.3	3.6		10.0	5.2
Noise + Normo.	Ck	26.7	6.7	**	24.2	5.8	**	20.8	4.2	**	16.7	4.2		10.0	4.7
	2	20.8	7.0	**	17.5	4.4	**	18.3	3.3	*	15.0	3.4		5.0	5.3
	4	38.3	6.9	**	28.3	5.9	**	21.7	4.8	**	14.2	5.5		10.8	5.5
	8	48.3	5.7	**	35.0	8.9	**	28.3	4.4	**	23.3	6.5	**	10.8	4.4
	16	33.3	6.0	**	21.7	4.4	**	20.0	5.0	**	14.2	5.2		5.8	3.5
	24	35.8	9.0	**	21.7	8.2	**	10.8	6.5		10.0	5.0		5.0	4.1
	32	43.3	7.0	**	26.7	5.3	**	14.2	4.5		8.3	4.4		5.8	2.4
Noise + Hypo.	Ck	11.0	4.3	*	0.0	1.6		2.0	3.0		2.0	3.0		3.0	3.4
	2	2.0	4.4		2.0	1.2		−2.0	3.4		−2.0	2.0		−2.0	2.0
	4	3.0	2.5		1.0	1.0		2.0	2.0		0.0	1.6		1.0	2.4
	8	21.0	4.0	**	12.0	3.7	**	8.0	3.4		7.0	4.1		5.0	4.7
	16	13.0	5.1	**	3.0	2.5		0.0	3.5		3.0	2.5		3.8	1.3
	24	19.0	5.8	**	2.0	2.5		2.0	3.0		0.0	1.6		−1.3	1.3
	32	23.0	3.0	**	4.0	3.7		3.0	2.0		1.0	1.9		2.5	2.5

Significance level.

** < 0.01, * < 0.05.

Summary of ABR threshold shifts from baseline obtained before and after exposure to 2 h of 105 dB noise. Results of mean ± SE ABR threshold shifts for noise only, normothermia, and hypothermia TTM animals are shown for all tested stimuli (click, 2–32 kHz). Group-specific statistical difference from pre-noise measurements was obtained at 1, 3, 7, 14, and 28 DPN (*p < 0.05, **p < 0.01). Significant values in bold. ABR Threshold Shifts up to 28 DPN. dB, decibels; Normo, Normothermia; Hypo, Hypothermia; DPN, days post-noise; Ck, Click; Mean ± SE.