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. 2020 Jun 10;21(1):72. doi: 10.1186/s10194-020-01145-y

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© The Author(s) 2020

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 1 — Recurrent nitroglycerine (NTG) injection induced thermal hyperalgesia and vestibular dysfunction. a Timeline of behavior studies’ protocol. b Basal and post-treatment responses (c) of hindpaw thermal hyperalgesia were markedly increased in a time dependent manner after NTG injection. d Head grooming time was significantly increased in NTG-treated rats compared with vehicle-treated group. Balance beam walk (e), geotaxis reflex (f) and vestibular dysfunction scores (g) showing that repeated NTG administration produced significant impairments in dynamic and static postural control compared with the vehicle group. n = 8/group. Data are mean ± SEM. Analysis of variance (ANOVA), Tukey; *p < 0.05 compared with vehicle, #p < 0.05 compared with before NTG injection