title: Estimating exercise capacity from walking tests in elderly individuals with stable coronary artery disease.
abstract: OBJECTIVE
  Compared with symptom-limited cardiopulmonary exercise test (CPET), timed walking tests are cheaper, well-tolerated and simpler alternative for assessing exercise capacity in coronary artery disease (CAD) patients. We developed multivariate models for predicting peak oxygen consumption (VO2peak) from 6-minute walk test (6MWT) distance and peak shuttle walk speed for elderly stable CAD patients.
  
  
  METHODS
  Fifty-eight CAD patients (72 SD 6 years, 66% men) completed: (1) CPET with expired gas analysis on a cycle ergometer, (2) incremental 10-meter shuttle walk test, (3) two 6MWTs, (4) anthropometric assessment and (5) 30-second chair stands. Linear regression models were developed for estimating VO2peak from 6MWT distance and peak shuttle walk speed as well as demographic, anthropometric and functional variables.
  
  
  RESULTS
  Measured VO2peak was significantly related to 6MWT distance (r = 0.719, p < 0.001) and peak shuttle walk speed (r = 0.717, p < 0.001). The addition of demographic (age, gender), anthropometric (height, weight, body mass index, body composition) and functional characteristics (30-second chair stands) increased the accuracy of predicting VO2peak from both 6MWT distance and peak shuttle walk speed (from 51% to 73% of VO2peak variance explained).
  
  
  CONCLUSIONS
  Addition of demographic, anthropometric and functional characteristics improves the accuracy of VO2peak estimate based on walking tests in elderly individuals with stable CAD. Implications for Rehabilitation Timed walking tests are cheaper, well-tolerated and simpler alternative for assessing exercise capacity in cardiac patients. Walking tests could be used to assess individual's functional capacity and response to therapeutic interventions when symptom-limited cardiopulmonary exercise testing is not practical or not necessary for clinical reasons. Addition of demographic, anthropometric and functional characteristics improves the accuracy of peak oxygen consumption estimate based on 6-minute walk test distance and peak shuttle walk speed in elderly patients with coronary artery disease.
authors.affiliation: Cardiac Rehabilitation Research Laboratory, School of Physical Education, University of Otago , Dunedin , New Zealand .
authors.forename: Sandra
authors.initials: S
authors.lastname: Mandic
authors.forename: Robert
authors.initials: R
authors.lastname: Walker
authors.forename: Emily
authors.initials: E
authors.lastname: Stevens
authors.forename: Edwin R
authors.initials: ER
authors.lastname: Nye
authors.forename: Dianne
authors.initials: D
authors.lastname: Body
authors.forename: Leanne
authors.initials: L
authors.lastname: Barclay
authors.forename: Michael J A
authors.initials: MJ
authors.lastname: Williams
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000886:Anthropometry; D003324:Coronary Artery Disease / Q000503:physiopathology*; D004562:Electrocardiography / Q000379:methods*; D005080:Exercise Test / Q000379:methods*; D017079:Exercise Tolerance / Q000502:physiology*; D005260:Female; D006801:Humans; D016014:Linear Models; D008297:Male; D008875:Middle Aged; D010101:Oxygen Consumption / Q000502:physiology*; D016138:Walking / Q000502:physiology*