title: Electromyographic responses of the superficial quadriceps femoris muscles during incremental treadmill running.
abstract: BACKGROUND
  We examined the individual patterns of responses for electromyographic (EMG) amplitude and mean power frequency (MPF) during incremental treadmill running.
  
  
  METHODS
  Nine physically active men performed incremental treadmill running at a constant grade of 1%. The EMG signal was recorded from the 3 superficial quadriceps femoris muscles during the work bout.
  
  
  RESULTS
  The results of the polynomial regression indicated that the linear model best fit the data for the composite data for all 3 muscles and the majority (7 of 9) of subjects. There were no consistent patterns of responses for the EMG MPF responses. Also, there were no significant (P > 0.05) muscle × running velocity interactions for EMG amplitude and MPF.
  
  
  CONCLUSIONS
  These results indicate consistent patterns of responses for EMG amplitude during incremental treadmill running, regardless of which muscle was studied.
authors.affiliation: Department of Exercise Science, Creighton University, Omaha, Nebraska, USA.
authors.forename: Jorge M
authors.initials: JM
authors.lastname: Zuniga
authors.forename: Moh H
authors.initials: MH
authors.lastname: Malek
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D004576:Electromyography; D019054:Evoked Potentials, Motor / Q000502:physiology*; D005080:Exercise Test; D006801:Humans; D008297:Male; D009119:Muscle Contraction / Q000502:physiology*; D052097:Quadriceps Muscle / Q000294:innervation / Q000502:physiology*; D012420:Running / Q000502:physiology*; D055815:Young Adult
keywords: amplitude; exercise; exercise physiology; fatigue; neuromuscular response