The lack of difference in muscular activity between controls and patients with TTH in the
present study is in concordance with a study published by Schoenen et al.They found that EMG
activity in pericranial muscles during postural changes and mental activity in patients with chronic TTH was not different from healthy controls. Our results are, moreover, partly in concordance with the results published by Bansevicius et al. , who used the same cognitive stressors as in the present study. They found a higher EMG response for patients with TTH than in controls in the splenius and trapezius, but it turns out that the discrepancy is apparently related mainly to a lower control group EMG response than in our study. It is also possible
that patients recruited from our tertiary headache department were more severely affected than TTH patients recruited mainly from primary care physicians in the previous study.