title: Eccentric strength and endurance in patients with unilateral intermittent claudication.
abstract: OBJECTIVE
  To analyze concentric and eccentric strength and endurance in patients with unilateral intermittent claudication.
  
  
  BACKGROUND
  Basic motor tasks are composed of concentric, isometric, and eccentric actions, which are related and contribute to physical performance. In previous studies of patients with intermittent claudication, the disease-related reduction in concentric and isometric muscular strength and endurance resulted in poorer walking performance. To date, no study has evaluated eccentric muscle action in patients with intermittent claudication.
  
  
  METHODS
  Eleven patients with unilateral intermittent claudication performed isokinetic concentric and eccentric actions at the ankle joints to assess peak torque and total work in both symptomatic and asymptomatic legs.
  
  
  RESULTS
  Concentric peak torque and total work were lower in the symptomatic than in the asymptomatic leg (80 +/- 32 vs. 95 +/- 41 N/m, P = 0.01; 1479 +/- 667 vs. 1709 +/- 879 J, P = 0.03, respectively). There were no differences in eccentric peak torque and total work between symptomatic and asymptomatic legs (96 +/- 30 vs. 108 +/- 48 N/m; 1852 +/- 879 vs. 1891 +/- 755 J, respectively).
  
  
  CONCLUSIONS
  Strength and endurance in the symptomatic leg were lower during concentric compared to eccentric action. Future studies are recommended to investigate the mechanisms underlying these responses and to analyze the effects of interventions to improve concentric strength and endurance on functional limitations in patients with intermittent claudication.
authors.affiliation: School of Physical Education and Sports, University of São Paulo, São Paulo, SP, Brazil.
authors.forename: Márcio
authors.initials: M
authors.lastname: Basyches
authors.forename: Nelson
authors.initials: N
authors.lastname: Wolosker
authors.forename: Raphael Mendes
authors.initials: RM
authors.lastname: Ritti-Dias
authors.forename: Lucas Caseri
authors.initials: LC
authors.lastname: Câmara
authors.forename: Pedro
authors.initials: P
authors.lastname: Puech-Leão
authors.forename: Linamara Rizzo
authors.initials: LR
authors.lastname: Battistella
mesh_terms: D055109:Ankle Brachial Index; D005080:Exercise Test; D006801:Humans; D007383:Intermittent Claudication / Q000503:physiopathology*; D007866:Leg; D008297:Male; D008875:Middle Aged; D009119:Muscle Contraction / Q000502:physiology*; D053580:Muscle Strength / Q000502:physiology*; D010807:Physical Endurance / Q000502:physiology*; D019415:Torque