title: The relationship between anthropometric indicators and walking distance in patients with chronic obstructive pulmonary disease.
abstract: BACKGROUND
  Exercise intolerance is a major issue affecting many people with COPD. Six-minute walking distance (6MWD) is a widely used indicator of exercise capacity in patients with COPD. The process is strenuous and time-consuming, especially for patients who have muscle wasting. Anthropometric indicators that reflect body lean mass, such as body mass index (BMI), mid-arm circumference (MAC), and calf circumference (CC), may have value in predicting exercise intolerance.
  
  
  OBJECTIVE
  This study attempted to determine the abilities of simple anthropometric indicators including BMI, MAC, and CC in reflecting the exercise intolerance of COPD patients.
  
  
  METHODS
  We recruited 136 nonhospitalized ambulatory COPD patients without acute conditions from a general hospital in Taiwan. Each subject's BMI, MAC, and CC were measured, and they were examined with pulmonary function tests and a 6-minute walk test.
  
  
  RESULTS
  Among the three anthropometric indicators examined, CC showed the strongest correlation with the 6MWD, followed by MAC and BMI. CC was also strongly associated with functional capacity, followed by MAC, according to the receiver operating characteristic curves. CC and MAC, but not BMI, were significantly associated with exercise intolerance according to logistic regression models that controlled for potential confounders.
  
  
  CONCLUSIONS
  Among the three variables examined, CC and walking distance may have the strongest association in COPD patients. CC may have value in serving as an adjunct to 6MWD in evaluating exercise intolerance of patients with COPD.
authors.affiliation: School of Respiratory Therapy, College of Medicine, Taipei Medical University, Taipei, Taiwan.
authors.forename: Shu-Chuan
authors.initials: SC
authors.lastname: Ho
authors.affiliation: Department of Healthcare Administration, Asia University, Wufeng, Taichung, Taiwan ; Department of Nursing, Kang-Ning Junior College of Medical Care and Management, Taipei, Taiwan.
authors.forename: Min-Fang
authors.initials: MF
authors.lastname: Hsu
authors.affiliation: Department of Thoracic Medicine, Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Taipei, Taiwan.
authors.forename: Han-Pin
authors.initials: HP
authors.lastname: Kuo
authors.affiliation: Department of Healthcare Administration, Asia University, Wufeng, Taichung, Taiwan.
authors.forename: Jiun-Yi
authors.initials: JY
authors.lastname: Wang
authors.affiliation: Department of Thoracic Medicine, Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Taipei, Taiwan.
authors.forename: Li-Fei
authors.initials: LF
authors.lastname: Chen
authors.affiliation: Division of Pulmonary Medicine, Department of Internal Medicine, Shuang Ho Hospital, Taipei Medical University, Taipei, Taiwan ; Department of Internal Medicine, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan.
authors.forename: Kang-Yun
authors.initials: KY
authors.lastname: Lee
authors.affiliation: School of Respiratory Therapy, College of Medicine, Taipei Medical University, Taipei, Taiwan.
authors.forename: Hsiao-Chi
authors.initials: HC
authors.lastname: Chuang
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001823:Body Composition; D015992:Body Mass Index; D003430:Cross-Sectional Studies; D005080:Exercise Test / Q000379:methods*; D005260:Female; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D029424:Pulmonary Disease, Chronic Obstructive / Q000503:physiopathology*; D012372:ROC Curve; D016138:Walking / Q000502:physiology*
keywords: 6-minute walk distance; BMI; COPD; calf circumference; mid-arm circumference