title: Reliability of the assessment of peripheral muscle fatigue induced by high-intensity intermittent exercise.
abstract: OBJECTIVE
  Reliability of the assessment of peripheral fatigue induced in knee extensors by high-intensity intermittent running exercise (HIE) was established in ten amateur soccer players (age: 18±1, height: 178±5 cm, weight: 68±8 kg).
  
  
  METHODS
  Transcutaneous electrical stimulations before and after HIE determined muscle contractile properties on three separate occasions (T1, T2 and T3), each separated by 7 days.
  
  
  RESULTS
  No significant differences were noted for any of the parameters measured (P=0.101). The ICC values for peak torque (PT) varied from moderate to high, with the exception of PT at 10-Hz calculated comparing T2 vs. T1 (range PRE=0.78-0.92; POST=0.76-0.97). The ICC derived from PT percentage decrements data were all low, with the exception of PT decrements at 1 Hz calculated comparing T3 vs. T2 (ICC=0.85, moderate). The TE for all contractile parameters obtained using 1-Hz and 100-Hz electrical stimulations were below 10%, including some that demonstrated a TE lower than 5%. Muscle contractile properties determined using 10-Hz stimulations showed a higher level of TE (range: 3.2-15.1%). Similar results were obtained for maximal rate of torque development and torque relaxation.
  
  
  CONCLUSIONS
  From the results of this study it can be concluded that muscle contractile properties express a good level of reliability in baseline and postexercise measures following familiarization.
authors.affiliation: Human Performance Laboratory, MAPEI Sport Research Centre, Olgiate Olona, Varese, Italy - ermanno.rampinini@mapeisport.it.
authors.forename: E
authors.initials: E
authors.lastname: Rampinini
authors.forename: D R
authors.initials: DR
authors.lastname: Connolly
authors.forename: L
authors.initials: L
authors.lastname: Oppici
authors.forename: G
authors.initials: G
authors.lastname: Alberti
authors.forename: A
authors.initials: A
authors.lastname: La Torre
authors.forename: A
authors.initials: A
authors.lastname: Bosio
mesh_terms: D000293:Adolescent; D000072696:High-Intensity Interval Training; D006801:Humans; D007717:Knee / Q000502:physiology*; D009119:Muscle Contraction / Q000502:physiology; D018763:Muscle Fatigue / Q000502:physiology*; D018482:Muscle, Skeletal / Q000502:physiology*; D015203:Reproducibility of Results; D012420:Running / Q000502:physiology*; D012916:Soccer / Q000502:physiology; D019415:Torque; D004561:Transcutaneous Electric Nerve Stimulation