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CSA of the different muscle fibre types. CSA of type I, type IIa, type IIa/x and type IIx in the lumbar ES (white) and MF (black) muscle. Values are presented as mean±SE. CSA, cross-sectional area; ES, erector spinae; MF, multifidus; SE, standard error. *P=0.0053 ES vs. MF.
