title: Utility of electromyographic fatigue threshold during treadmill running.
abstract: BACKGROUND
  We investigated 2 different methods for determining muscle fatigue threshold by electromyography (EMG).
  
  
  METHODS
  Thirteen subjects completed an incremental treadmill running protocol for EMG fatigue threshold (EMGFT ) determination based on the critical power concept (EMGFT 1) and the breakpoint in the linear relationship between EMG amplitude and exercise intensity (EMGFT 2). Then, both the EMGFT 1 and EMGFT 2 were tested in a continuous treadmill running protocol. EMG was recorded from the rectus femoris (RF), vastus lateralis (VL), biceps femoris (BF), and lateral gastrocnemius (LG) muscles.
  
  
  RESULTS
  For BF, EMGFT 2 was higher than EMGFT 1, and EMGFT 1 for BF was lower than EMGFT 1 for LG. EMG of RF was higher at EMGFT 2 than at EMGFT 1, and LG EMG was lower at EMGFT 2.
  
  
  CONCLUSIONS
  EMGFT can be determined during a single treadmill running test, and EMGFT 1 may be the most appropriate method to estimate the muscle fatigue threshold during running.
authors: Department of Physical Education, São Paulo State University, 1515, 24 A Avenue, Bela Vista, 13506-900, Rio Claro, São Paulo, Brazil.
authors: Luciano F
authors: LF
authors: Crozara
authors: Department of Physical Education, São Paulo State University, 1515, 24 A Avenue, Bela Vista, 13506-900, Rio Claro, São Paulo, Brazil.
authors: Alex
authors: A
authors: Castro
authors: Department of Physical Education, São Paulo State University, 1515, 24 A Avenue, Bela Vista, 13506-900, Rio Claro, São Paulo, Brazil.
authors: Antonio F
authors: AF
authors: De Almeida Neto
authors: Department of Kinesiology, University of New Hampshire, Durham, New Hampshire, USA.
authors: Dain P
authors: DP
authors: Laroche
authors: Department of Physical Education, São Paulo State University, 1515, 24 A Avenue, Bela Vista, 13506-900, Rio Claro, São Paulo, Brazil.
authors: Adalgiso C
authors: AC
authors: Cardozo
authors: Department of Physical Education, São Paulo State University, 1515, 24 A Avenue, Bela Vista, 13506-900, Rio Claro, São Paulo, Brazil.
authors: Mauro
authors: M
authors: Gonçalves
mesh_terms: D000293:Adolescent; D004576:Electromyography; D005080:Exercise Test; D006801:Humans; D009119:Muscle Contraction / Q000502:physiology; D018763:Muscle Fatigue / Q000502:physiology*; D018482:Muscle, Skeletal / Q000502:physiology*; D010807:Physical Endurance / Q000502:physiology*; D012420:Running / Q000502:physiology*; D013997:Time Factors; D055815:Young Adult
keywords: electromyographic threshold; electromyography; fatigue threshold; muscle fatigue; treadmill running