SYNOPSIS Frontalis electromyogram (EMG) activity was monitored in ten subjects with a high frequency of muscle contraction headaches, and ten subjects with low frequency of muscle contraction headaches at rest, during stressful mental artithmetic and after stress. The frontalis EMG activity of the high‐frequency headache group was significantly greater than that of the low‐frequency headache group in the pre‐stress condition. Significant increases in EMG activity from pre‐stress to stress were found in the low‐frequency headache group but not the high‐frequency headache group. Significant correlations were found between perceived level of relaxation and EMG in the low‐frequency headache group, but not for the high frequency headache group.
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Vaughn et al. (1977) studied this question.