title: Changes in strength, endurance, and fatigue during a resistance-training program for the triceps brachii muscle.
abstract: BACKGROUND
  As a result of the adaptation process, some functional properties show different functions over time during strength training. Muscle strength and fatigue may show different adaptation patterns in reaching the improvement plateau after several weeks of training.
  
  
  OBJECTIVE
  To follow muscle endurance and fatigue values during resistance training of the elbow extensors in young nonathletes.
  
  
  METHODS
  Descriptive laboratory study.
  
  
  METHODS
  Controlled laboratory.
  
  
  METHODS
  Nineteen healthy young nonathletes (age = 21.0 ± 1.1 years; body mass index = 25.2 ± 2.9 kg/m(2)).
  
  
  METHODS
  Triceps brachii resistance training was performed on the isoacceleration dynamometer for 10 weeks (frequency = 5 times a week, 5 sets of 10 maximal elbow extensions, 1-minute resting period between sets).
  
  
  METHODS
  Measurements of endurance strength and fatigability were conducted using the same equipment, and endurance strength (ES), fatigue rate (FR), and decrease in strength (DS) were defined.
  
  
  RESULTS
  All measured values for triceps brachii strength changed after training (ES increased by 57%, FR decreased by 68%, and DS improved by 59%; P < .001). No correlation was found between ES and the fatigability values-FR and DS (r(2) = 0.37 for FR and r(2) = 0.04 for DS; P > .05). The FR and DS trends showed specific functions, which reached a plateau after 4 weeks of training, and we found no further weekly changes in these values as the training continued. As an adaptation to exercise, ES showed a continuous, yet not linear, increase.
  
  
  CONCLUSIONS
  Fatigability in the triceps brachii decreased in the first 4 weeks of training. After that period, muscle functional properties improved as a result of increased endurance.
authors.affiliation: Laboratory for Functional Diagnostics, Department of Physiology, Medical School, University of Novi Sad, Serbia.
authors.forename: Jelena Z Popadic
authors.initials: JZ
authors.lastname: Gacesa
authors.forename: Aleksandar V
authors.initials: AV
authors.lastname: Klasnja
authors.forename: Nikola G
authors.initials: NG
authors.lastname: Grujic
mesh_terms: D000328:Adult; D056352:Athletes; D004550:Elbow / Q000502:physiology; D004551:Elbow Joint / Q000502:physiology; D005221:Fatigue / Q000503:physiopathology*; D005542:Forearm / Q000502:physiology; D006801:Humans; D008297:Male; D053580:Muscle Strength / Q000502:physiology*; D018482:Muscle, Skeletal / Q000502:physiology; D064797:Physical Conditioning, Human / Q000379:methods*; D010807:Physical Endurance / Q000502:physiology*; D055070:Resistance Training / Q000379:methods*; D055815:Young Adult
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