title: Type 2 diabetes mellitus patients manifest characteristic spatial EMG potential distribution pattern during sustained isometric contraction.
abstract: OBJECTIVE
  The purpose of the present study is to investigate spatial surface electromyography (SEMG) potential distribution pattern in type 2 diabetes mellitus (T2DM) patients.
  
  
  METHODS
  Nine T2DM patients and nine age-matched healthy men (CON) performed a sustained isometric knee extension at 10% of maximal voluntary contraction for 120s. Multi-channel SEMG was recorded from the vastus lateralis muscle by means of 64 electrodes. To characterize spatial SEMG potential distribution pattern, modified entropy and correlation coefficients between same electrode locations were calculated at 15, 60 and 120s for the root mean square values.
  
  
  RESULTS
  At 60 and 120s, modified entropy in T2DM was significantly lower than those in CON (p<0.05). Correlation coefficients for T2DM were significantly higher than those for CON at 60 and 120s (p<0.05).
  
  
  CONCLUSIONS
  From these results, we suggested that T2DM patients continue to recruit limited and same motor units during the sustained contraction at low force level.
authors.affiliation: Laboratory of Applied Physiology, Graduate School of Human and Environmental Studies, Kyoto University, Kyoto, Japan; Japan Society for the Promotion of Science (JSPS), Kyoto, Japan. watanabe.kohei@aw7.ecs.kyoto-u.ac.jp
authors.forename: Kohei
authors.initials: K
authors.lastname: Watanabe
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Miyamoto
authors.forename: Yoji
authors.initials: Y
authors.lastname: Tanaka
authors.forename: Kazuhito
authors.initials: K
authors.lastname: Fukuda
authors.forename: Toshio
authors.initials: T
authors.lastname: Moritani
mesh_terms: D000368:Aged; D003924:Diabetes Mellitus, Type 2 / Q000503:physiopathology*; D004576:Electromyography / Q000379:methods*; D006801:Humans; D007537:Isometric Contraction / Q000502:physiology*; D007717:Knee / Q000502:physiology; D007719:Knee Joint / Q000502:physiology; D008297:Male; D008875:Middle Aged; D018482:Muscle, Skeletal / Q000503:physiopathology; D052097:Quadriceps Muscle / Q000503:physiopathology; D016059:Range of Motion, Articular / Q000502:physiology