title: Reliability of the log-transformed EMG amplitude-power output relationship for incremental knee-extensor ergometry.
abstract: BACKGROUND
  The purpose of this investigation was to determine the reproducibility of the log-transformed model for electromyography (EMG) amplitude during incremental single-leg knee-extensor exercise.
  
  
  METHODS
  Eight healthy college-aged men performed 3 incremental tests on separate occasions on a knee-extensor ergometer. EMG amplitude was analyzed for each participant on each occasion for the rectus femoris and vastus medialis muscles at 4 different exercise power outputs (30%, 50%, 70%, and 90%) corresponding to each participant's maximal power output. Intraclass correlation coefficients (ICC) were determined for the slope and y-intercept terms derived from the log-transformed EMG amplitude-power output relationship for each muscle.
  
  
  RESULTS
  The ICC values for the rectus femoris (slope = 0.779; y-intercept = 0.787) and vastus medialis (slope = 0.756; y-intercept = 0.763) muscles were high.
  
  
  CONCLUSIONS
  The log-transformed EMG amplitude-power output relationship is a reliable index for measuring motor unit activation.
authors.affiliation: Integrative Physiology of Exercise Laboratory, Eugene Applebaum College of Pharmacy & Health Sciences, 259 Mack Avenue, Room 2248, Detroit, Michigan, 48201, USA.|Physical Therapy Program, Wayne State University, College of Pharmacy and Health Sciences, Department of Health Care Sciences, Detroit, Michigan, USA.
authors.forename: Travis
authors.initials: T
authors.lastname: Eason
authors.affiliation: Integrative Physiology of Exercise Laboratory, Eugene Applebaum College of Pharmacy & Health Sciences, 259 Mack Avenue, Room 2248, Detroit, Michigan, 48201, USA.|Physical Therapy Program, Wayne State University, College of Pharmacy and Health Sciences, Department of Health Care Sciences, Detroit, Michigan, USA.
authors.forename: Christine R
authors.initials: CR
authors.lastname: Gavel
authors.affiliation: Integrative Physiology of Exercise Laboratory, Eugene Applebaum College of Pharmacy & Health Sciences, 259 Mack Avenue, Room 2248, Detroit, Michigan, 48201, USA.|Physical Therapy Program, Wayne State University, College of Pharmacy and Health Sciences, Department of Health Care Sciences, Detroit, Michigan, USA.
authors.forename: Kyle A
authors.initials: KA
authors.lastname: Hawley
authors.affiliation: Physical Therapy Program, Wayne State University, College of Pharmacy and Health Sciences, Department of Health Care Sciences, Detroit, Michigan, USA.
authors.forename: Sujay S
authors.initials: SS
authors.lastname: Galen
authors.affiliation: Integrative Physiology of Exercise Laboratory, Eugene Applebaum College of Pharmacy & Health Sciences, 259 Mack Avenue, Room 2248, Detroit, Michigan, 48201, USA.|Physical Therapy Program, Wayne State University, College of Pharmacy and Health Sciences, Department of Health Care Sciences, Detroit, Michigan, USA.
authors.forename: Moh H
authors.initials: MH
authors.lastname: Malek
mesh_terms: D000328:Adult; D004576:Electromyography / Q000379:methods*; D016552:Ergometry / Q000379:methods*; D006801:Humans; D008297:Male; D009119:Muscle Contraction / Q000502:physiology*; D052097:Quadriceps Muscle / Q000502:physiology*; D015203:Reproducibility of Results; D012815:Signal Processing, Computer-Assisted; D055815:Young Adult
keywords: exercise physiology; fitness/health; muscle; neuromuscular; statistics