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. 2022 May 18;12:8306. doi: 10.1038/s41598-022-11683-x

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Muscle oxygenation of M. longissimus and M. multifidus of a representative asymptomatic subject (a) and a representative CNSLBP patient (b) before (0–2 min), during (2 to maximal 6 min) and after execution of the Biering–Sorensen muscle endurance (BSME) test. The green lines indicate the start and the end of the BSME test.