Respiration and the watershed of spinal CSF flow in humans.

Sci Rep · 2018 · PMC5884798 · PMID 29618801

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a clear trendno p-value reported

During exhalation CSF follows a caudal movement (blue), which is most prominent in lower thoracic regions, while upper thoracic and cervical levels do not exhibit a clear trend.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.