From the paper:
"Mean CSF (Cerebro-Spinal Fluid) lactate levels in CFS, FM and CFS+FM did not differ among the three groups, but were all significantly higher than the mean values for control subjects."
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5754037/
"Mean CSF (Cerebro-Spinal Fluid) lactate levels in CFS, FM and CFS+FM did not differ among the three groups, but were all significantly higher than the mean values for control subjects."
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5754037/