Changes in electrophysiologic response during repeated contraction training of the tibialis anterior

Abstract

[Purpose] This study examined the changes in the electrophysiologic response of the tibialis anterior during repeated contraction training. [Methods] We recruited 16 normal adult women without musculoskeletal or neurological disorders for this research. They were divided into an electrical stimulation training group and an electrical/voluntary group. and for electrical stimulation analysis at the 5th, 10th, 15th, 20th, 25th and 30th contraction time electrical stimulations. Maximum voluntary contraction for 6 sec followed by a rest break of 3 sec was performed, repeatedly. The non-dominant tibialis anterior was measured using electromyography and a dynamometer. [Results] MVIC (maximal voluntary isometric contraction), RMS (root mean square), IEMG (intergrated electromyograms) and MDF (median frequency) showed no statistically significant differences in interaction between contraction time and group or main effects between groups, but changes in the main effect of contraction time were significantly different between the groups. The electrical stimulation training group showed a significant difference after 15, 20, 25, and 30 stimulations compared to the first contraction. Group combining voluntary exercise and electrical stimulation showed significant differences after 15, 20, 25, and 30 stimulations compared to the first contraction. [Conclusion] There was decline in electrophysiologic response after repeated contraction training of the tibialis anterior by electrical stimulation and by electrical stimulation and voluntary repeated contraction training and timing that significant decrease was found by the number of repeated contraction trainings of MVIC, RMS, IEMG, and MDF was different.