A controlled clinical trial investigating the effects of stretching and compression exercises on electromyography of calf muscles in chronic LBP patients with a deep gluteal syndrome.

"Declarations Ethics approval and consent to participateThe study was approved by the ethics committee of Kermanshah University of Medical Sciences (Reference number: kums.rec.1395.169) and all methods were performed in accordance with the Declaration of Helsinki. All study participants gave full informed written consented to take part. Consent for publicationWritten informed consent was obtained from the patient for publication of any accompanying images. Competing interestsThe authors declare no competing interests. Competing interests The authors declare no competing interests."

"Funding Funding was supported by Kermanshah University of Medical Sciences (reference number: 95598). We affirm that we have no financial affiliation (including research funding) or involvement with any commercial organization that has a direct financial interest in any matter included in this manuscript."

"Trial registration The trial was retrospectively registered in the Iranian Registry of Clinical Trials (www.irct.ir) on 10/01/2017 as IRCT201604178035N4. URL of the record: https://en.irct.ir/trial/8473."