Striate Muscle Tensional Patterning in Frontalis EMG Biofeedback

Publisher Website
Google Scholar
Abstract
Four normal male subjects were exposed to 5 30‐min alternate‐day sessions of continuous frontalis EMG biofeedback training preceded by 15‐min adaptation periods. A computer‐controlled scanning electromyograph sampled integrated EMG activity from the frontalis and seven adjunctive muscle groups. Tensional profiles for all eight muscle groups were assembled every 1.84 sec, resulting in an 8 × 960 data array for each session. Statistical analyses revealed that although frontalis EMG levels decreased significantly in the training, those of adjunctive recording sites did not. Cross correlation analyses for session 1 frontalis and adjunctive site EMG levels showed typically negligible correlations at all temporal lags, although some neck sites showed moderate cross correlation with the frontalis in 2 subjects. Separate principal‐component analyses for sessions 1 and 5 produced little evidence for a general muscle tension factor. Low coefficients of congruence between session 1 and session 5 truncated‐component solutions demonstrated little replicability of tensional linkages from the first to the last session.