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Effect of dimenhydrinate on autonomic activity in humans

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Abstract

The purpose of this study was to examine the effect of dimenhydrinate on resting muscle sympathetic nerve activity (MSNA), the vestibulosympathetic reflex, and the baroreflexes. Sixteen subjects participated in two double-blinded studies that measured mean arterial pressure (MAP), heart rate (HR), and MSNA responses before and after oral administration of dimenhydrinate (100 mg) or a placebo. In study one, 3 min of head-down rotation (HDR) was performed to engage the otolith organs. Dimenhydrinate (n = 10) did not alter resting MSNA, MAP, or HR. HDR increased MSNA before (Δ5 ± 1 bursts/min; P < 0.01) and after (Δ4 ± 1 bursts/min; P < 0.01) drug administration, but these responses were not different from the placebo (n = 6). In study two, 4 min of lower body negative pressure (LBNP) at −30 mmHg was performed. During the third min of LBNP, HDR was performed. MSNA increased during the first 2 min of LBNP before (Δ13 ± 2 bursts/min; P < 0.01) and after (Δ14 ± 2 bursts/min; P < 0.01) dimenhydrinate. HDR combined with LBNP increased MSNA further during the third min of LBNP (Δ18 ± 2 bursts/min before and Δ17 ± 2 bursts/min after dimenhydrinate; P < 0.01). These responses were not significantly different from the placebo. In contrast, HR responses to LBNP during the dimenhydrinate trial were increased when compared to all other trials (Δ5 ± 1 beats/min; P < 0.01). These results indicate that dimenhydrinate augments heart rate responses to baroreceptor unloading, but does not alter resting MSNA, the sympathetic baroreflexes, or the vestibulosympathetic reflex.

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Acknowledgments

We thank Charity Sauder and Erica McHugh for their technical assistance with in this project. This study was supported by grants from the National Institutes of Health (DC006549 and P01 HL077670; C.A. Ray), the National Space and Biomedical Research Institute (CA00404; C.A. Ray), and the Michigan Tech Research Excellence Fund (REF060605; J.R. Carter). Additional support was provided by a National Institutes of Health sponsored General Clinical Research Center with National Center for Research Resources Grant (M01 RR10732 and C06 RR016499).

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Correspondence to Jason R. Carter PhD.

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Carter, J.R., Ray, C.A. Effect of dimenhydrinate on autonomic activity in humans. Clin Auton Res 17, 186–192 (2007). https://doi.org/10.1007/s10286-007-0417-0

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