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. 2018 Apr 18;13:21. doi: 10.1186/s13020-018-0180-2

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© The Author(s) 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. 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.

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Fig. 1 — Changes of lung function in rats in each group. a Changes in inspiratory resistance of the airway in rats. Inspiratory resistance of asthmatic rat model was significantly higher than that of the normal control group, and inspiratory resistance decreased after DXM and WTD treatments. b Changes in airway expiratory resistance in rats. The expiratory resistance of the asthmatic rat model was significantly higher than that in the normal control group, and the expiratory resistance decreased after DXM and WTD treatments. c Changes in the dynamic compliance of the airway in rats. Airway compliance in asthmatic rat model was significantly lower than that in the normal control group, and the expiratory resistance increased after DXM and WTD treatments (*p < 0.05, compared with the normal group; ^#p < 0.05, compared with the model group; n = 8)