Changes in EMG characteristics and metabolic energy cost during 90-min prolonged running

Daijiro Abe, Satoshi Muraki, Kazumasa Yanagawa, Yoshiyuki Fukuoka, Shigemitsu Niihata

    Research output: Contribution to journalArticlepeer-review

    22 Citations (Scopus)


    This study quantified the interaction of integrated electromyography (iEMG) obtained from the vastus lateralis and the metabolic energy cost of running (Cr), an index to assess running economy, during 90-min prolonged running. The iEMG during running was divided into eccentric (ECC) and concentric (CON) phases using a force platform and a knee-joint goniometer. The ratio of ECC to CON (ECC/CON ratio) significantly decreased during 90-min prolonged running in novice distance runners, which would be explained by an increase in muscle activity during the CON phase of running. The average Cr value significantly increased during 90-min prolonged running. The individual's Cr values significantly correlated with the ECC/CON ratio (r = -0.702, P < 0.05). These results suggest that changes in the ECC/CON ratio and Cr value during prolonged running are associated.

    Original languageEnglish
    Pages (from-to)607-610
    Number of pages4
    JournalGait and Posture
    Issue number4
    Publication statusPublished - Oct 2007

    All Science Journal Classification (ASJC) codes

    • Biophysics
    • Orthopedics and Sports Medicine
    • Rehabilitation


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