title: Muscle activation during resistance exercise at 70% and 90% 1-repetition maximum in resistance-trained men.
abstract: Muscle activation was investigated during resistance exercise with 2 relatively high-intensity loads.
  
  
  
  Ten resistance-trained men performed the leg press exercise to repetition failure: a set at 70% of 1-repetition maximum (1RM) and a set at 90% of 1RM. Surface electromyography (EMG) was used to assess peak and mean muscle activation of the vastus lateralis, rectus femoris, and vastus medialis.
  
  
  
  Peak and mean EMG remained greater at 90% than 70% 1RM across all repetitions (P =  0.03 and P = 0.02, respectively). Main effects for trial were also significant for mean EMG activity of the final common repetitions (P = 0.03) favoring 90% 1RM; however, peak EMG activity was similar during the final common repetitions of the 70% and 90% 1RM sets.
  
  
  
  Across all repetitions, 90% 1RM appears to produce greater muscle activation during the leg press exercise, but similar peak EMG was observed during the final common repetitions of each set. Muscle Nerve 56: 505-509, 2017.
authors.affiliation: Department of Health Professions, Hofstra University, Hempstead, New York, 11549, USA.
authors.forename: Adam M
authors.initials: AM
authors.lastname: Gonzalez
authors.affiliation: Department of Health Professions, Hofstra University, Hempstead, New York, 11549, USA.
authors.forename: Jamie J
authors.initials: JJ
authors.lastname: Ghigiarelli
authors.affiliation: Department of Health Professions, Hofstra University, Hempstead, New York, 11549, USA.
authors.forename: Katie M
authors.initials: KM
authors.lastname: Sell
authors.affiliation: Department of Health Professions, Hofstra University, Hempstead, New York, 11549, USA.
authors.forename: Edward W
authors.initials: EW
authors.lastname: Shone
authors.affiliation: Department of Health Professions, Hofstra University, Hempstead, New York, 11549, USA.
authors.forename: Christopher F
authors.initials: CF
authors.lastname: Kelly
authors.affiliation: Department of Exercise Science and Sport Management, Kennesaw State University, Kennesaw, Georgia, USA.
authors.forename: Gerald T
authors.initials: GT
authors.lastname: Mangine
mesh_terms: D000328:Adult; D004576:Electromyography / Q000379:methods*; D015444:Exercise / Q000502:physiology*; D006801:Humans; D008297:Male; D053580:Muscle Strength / Q000502:physiology*; D052097:Quadriceps Muscle / Q000502:physiology*; D055070:Resistance Training / Q000379:methods*; D016474:Weight-Bearing / Q000502:physiology*; D055815:Young Adult
keywords: EMG; electromyography; intensity; muscle activation; muscle activity; resistance training