Effect of reaction time condition on EMG activities of the biceps brachii muscle in elbow flexion and forearm supination.

J. A. Mojica, R. Nakamura, Y. Yamada, I. Tsuji

Research output: Contribution to journalArticlepeer-review

Abstract

Under simple- and choice-RT conditions, the biceps brachii muscle was examined in 8 healthy male subjects to determine how the temporal and spatial characteristics of elbow flexion and forearm supination differed at the initial phase of EMG activity and whether preparation or the presence of response uncertainty influenced the EMG outputs of the two movements. In the simple-RT condition, RT of supination was significantly faster than that of flexion but EMG activity of supination was less than that of flexion. In contrast, in the choice-RT condition, RT of flexion was significantly faster than that of supination but EMG activity of flexion was significantly reduced compared to supination. These findings indicate that advanced preparation or motor set facilitates the differentiation of RTs and EMG activities of the response movements and that response uncertainty causes a significant change in the temporal and spatial specificity of both elbow flexion and forearm supination.

Original languageEnglish
Pages (from-to)807-813
Number of pages7
JournalPerceptual and motor skills
Volume67
Issue number3
DOIs
Publication statusPublished - 1988 Dec

ASJC Scopus subject areas

  • Experimental and Cognitive Psychology
  • Sensory Systems

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