Effect of joint position on the electromyographic activity of the semitendinosus muscle

Jun Kubota, F. Kaneko, M. Shimada, Suguru Torii, T. Fukubayashi

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The semitendinosus (ST) muscle has a tendinous intersection within the muscle belly that separates the ST muscle into distinct proximal and distal compartments. Thus far, no study has compared the electromyographic (EMG) activities between the proximal and distal compartments of the human ST muscle. This study aimed to investigate the intramuscular EMG activity patterns of the proximal and distal compartments of the ST muscle by altering the hip and knee joint positions. The study population comprised eight healthy male volunteers. They performed ramp isometric knee flexion tasks form the relaxed state to the maximal voluntary contraction (MVC) state with (1) the hip and knee at 90° and 0°, respectively (90-0 position), (2) both the hip and knee at 0° (0-0 position), and (3) the hip and knee at 0° and 90°, respectively (0-90 position). Fine-wire electrodes were inserted into the proximal and distal compartments of the ST muscle and the individual EMG activities were recorded. In the 90-0 position, the EMG activity of the distal compartment was higher than that of the proximal compartment at 60%, 80%, and 90% MVC. Moreover, in the 0-90 position, the EMG activity of the proximal compartment was higher than that of the distal compartment at 60% MVC. These results indicated that the lengthened or shortened muscle conditions induced regional differences in the EMG activity patterns, while the two compartments showed equivalent activity when the muscle length was moderate.

Original languageEnglish
Pages (from-to)149-154
Number of pages6
JournalElectromyography and Clinical Neurophysiology
Volume49
Issue number4
Publication statusPublished - 2009 May

Fingerprint

Joints
Muscles
Knee
Hip
Architectural Accessibility
Hamstring Muscles
Hip Joint
Knee Joint
Healthy Volunteers
Electrodes
Population

Keywords

  • Fine-wire electrode
  • Intramuscular electromyography
  • Semitendinosus muscle

ASJC Scopus subject areas

  • Clinical Neurology
  • Physiology (medical)
  • Physiology

Cite this

Effect of joint position on the electromyographic activity of the semitendinosus muscle. / Kubota, Jun; Kaneko, F.; Shimada, M.; Torii, Suguru; Fukubayashi, T.

In: Electromyography and Clinical Neurophysiology, Vol. 49, No. 4, 05.2009, p. 149-154.

Research output: Contribution to journalArticle

Kubota, Jun ; Kaneko, F. ; Shimada, M. ; Torii, Suguru ; Fukubayashi, T. / Effect of joint position on the electromyographic activity of the semitendinosus muscle. In: Electromyography and Clinical Neurophysiology. 2009 ; Vol. 49, No. 4. pp. 149-154.
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