title: Effect of eccentric strengthening on pain, muscle strength, endurance, and functional fitness factors in male patients with achilles tendinopathy.
abstract: OBJECTIVE
  The aim of this study was to investigate the effect of eccentric strengthening on pain, muscle strength, endurance, and functional fitness factors in Achilles tendinopathy patients.
  
  
  METHODS
  Thirty-two male patients with Achilles tendinopathy were assigned to either the experimental group that performed eccentric strengthening or the control group that performed concentric strengthening (n = 16, both groups) for 8 wks (50 mins per day, three times per week). A visual analog scale, an isokinetic muscle testing equipment, the side-step test, and the Sargent jump test were used to assess pain, muscle strength, endurance, and functional fitness factors before and after the intervention.
  
  
  RESULTS
  In comparison with the control group, the experimental group showed significant improvement in pain, ankle dorsiflexion endurance, total balance index, and agility after the intervention (P < 0.05). However, there was no significant difference in dexterity between the two groups.
  
  
  CONCLUSIONS
  Eccentric strengthening was more effective than concentric strengthening in reducing pain and improving function in patients with Achilles tendinopathy; therefore, regular eccentric strengthening is important for patients in a clinical setting.
authors.affiliation: Department of Physical Therapy, Sahmyook University, Seoul, Republic of Korea.
authors.forename: JaeHo
authors.initials: J
authors.lastname: Yu
authors.forename: DaeSung
authors.initials: D
authors.lastname: Park
authors.forename: GyuChang
authors.initials: G
authors.lastname: Lee
mesh_terms: D000125:Achilles Tendon / Q000503:physiopathology*; D000328:Adult; D005081:Exercise Therapy / Q000379:methods*; D006801:Humans; D008297:Male; D053580:Muscle Strength / Q000502:physiology; D010147:Pain Measurement; D010807:Physical Endurance / Q000502:physiology; D004856:Postural Balance / Q000502:physiology; D052256:Tendinopathy / Q000503:physiopathology / Q000534:rehabilitation*; D055815:Young Adult