Table 1.

Influence of Sympathetic Stimulation on Spontaneous and Evoked Synaptic Potentials in Young and Geriatric Mice

Mice	N Mice	N Fibers	MEPP Frequency	MEPP Amplitude	EPP Amplitude Prestimulation	EPP Amplitude Poststimulation	p Value (PRE vs POST)	QC Prestimulation	QC Poststimulation	p value (pre vs post)
Young	6	26 (EPP) 43 (MEPP)	7.822 (0.673)	0.770 (0.013)	30.8 (1.7)	30.9 (1.7)	.968	39.3 (3.2)	38.2 (3.3)	.816
Geriatric	5	20 (EPP) 20 (MEPP)	9.180§ (1.480)	0.855§§ (0.032)	22.5* (1.58)	22.7** (1.68)	.933	29.2# (2.06)	29.5## (2.2)	.967

Note: QC = Quantal content. SEM is between parentheses. The number of fibers ranged from 4 to 6 per mouse.

^§MEPP frequency in young versus geriatric mice, p = .398. ^§§MEPP amplitude in young versus geriatric mice, p = .027. * Prestimulation EPP amplitude in young versus geriatric mice, p = .001; **Poststimulation EPP amplitude in geriatric versus young mice, p = .002; ^#Prestimulation QC in geriatric versus young mice, p = .014; ^##Poststimulation QC in geriatric versus young mice, p = .087.