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The purpose of this study was to compare premotor time(PMT) and electro-mechanical delay(EMD)between sitting and standing posture. Twenty four healthy young subjects(12 women and 12 men) participated inthis study. Subjects were instructed to perform maximal, voluntary, isometric contraction of ankle muscle(tibialisanterior and gastrocnemius muscles) in reaction to auditory stimulus. PMT and EMD, calculated from stimulus, EMGand torque profile were compared between sitting and standing postures. As statistical analysis, paired t-test was per-formed to assess difference between sitting and standing posture. In both tibialis anterior and gastrocnemius muscles,EMD was found to be significantly longer for standing than sitting. However, PMT in standing posture was longerthan that in sitting posture only in gastrocnemius muscles. These result indicate that increased reaction time, par-ticularly, increased EMD of ankle muscles in standing posture may be caused by co-contraction of ankle muscles forpostural control in standing posture.Key words: Premotor Time, Electro-mechanical Delay, Sitting Posture, Standing Posture, Tibialis Ante-rior, Gastrocnemius

Analysis of Premotor Time and Electro-Mechanical Delay of Ankle Joint Muscles: A Comparison between Sitting and Standing Postures