The effects of skill level on EMG activity during internal and external imagery

This study was designed to determine if muscular innervation during imagery was specific to muscles needed for actual performance and if individuals of different skill levels utilizing two imagery perspectives demonstrated differing amounts of muscular activity. A final purpose was to assess the effectiveness of the meditation-relaxation approach used in karate training to reduce tonic activity in muscles. Beginning and advanced (N = 36) karate students were randomly assigned to counterbalanced conditions of imagery perspective (internal/external) x skill level (beginning/advanced) x side (right/left) in a factorial design. EMG data were collected from both deltoid muscles before and after a relaxation session, during and between performances of imaginary arm lifts and between imagery perspectives. Following testing, a questionnaire involving the subject's perception of success at imagery was completed. The results of this investigation suggest that skill level does influence muscle innervation during ima...