title: Correlation between Limb Muscle Endurance, Strength, and Functional Capacity in People with Chronic Obstructive Pulmonary Disease.
abstract: OBJECTIVE
  To examine the correlation between limb muscle function (endurance and strength) and functional capacity in upper limbs (ULs) and lower limbs (LLs) of people with chronic obstructive pulmonary disease (COPD).
  
  
  METHODS
  This article describes a secondary analysis of data from a randomized controlled trial. A stationary dynamometer was used to measure isokinetic muscle strength and endurance; the 6-minute walk test, the 6-minute pegboard and ring test, and the unsupported UL exercise test were used to measure functional capacity.
  
  
  RESULTS
  Participants were 44 adults with COPD. Muscle strength and endurance in ULs and LLs demonstrated a moderate to strong correlation with functional capacity. When controlling for muscle strength, muscle endurance was moderately correlated with functional capacity in ULs and LLs, but when controlling for muscle endurance, there was no positive and significant correlation between muscle strength and functional capacity for the ULs or LLs.
  
  
  CONCLUSIONS
  Functional capacity seems to be more closely related to limb muscle endurance than to limb muscle strength in people with COPD.
authors: Department of Community Medicine and Rehabilitation, Physiotherapy, Umeå University, Umeå
authors: Andre
authors: A
authors: Nyberg
authors: Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, Stockholm; Department of Physiotherapy, Karolinska University Hospital, Stockholm, Sweden.
authors: Anna
authors: A
authors: Törnberg
authors: Department of Community Medicine and Rehabilitation, Physiotherapy, Umeå University, Umeå
authors: Karin
authors: K
authors: Wadell
keywords: chronic obstructive pulmonary disease; exercise test; lower extremity; muscle strength; upper extremity