title: Effects of instructions on physical capacities outcome in a workers' compensation setting.
abstract: Physical Capacity Evaluations (PCE) are often used in Pain Management Programs (PMP) to help determine patients' return-to-work status, continued rehabilitation and compensation.
  
  
  METHODS
  Groups of patients participating in a 4-week PMP were given the PCE upon entry to the program and again near discharge. Change in performance between the first and second testing was examined.
  
  
  OBJECTIVE
  The study was designed to examine the effects of instructions on patients' performance on the PCE.
  
  
  BACKGROUND
  An extensive literature suggests that, although commonly used, the PCE is of questionable validity in measuring actual physical capacity.
  
  
  METHODS
  Patients were assigned to one of 2 physical therapists and given a PCE (in this setting, a dynamic vs static strength test) on admission and near the time of discharge. The assessment by the 2 therapists differed in the instructions they gave their patients for the PCE. Both therapists told their groups, "Do the best you can," but only one therapist added, "This test will be used to determine your job classification." In the second half of the study both therapists gave identical instructions, "Do the best you can," and did not add the explanation.
  
  
  RESULTS
  Patients who were informed that the test would be used to determine their job classifications performed considerably worse than those not so informed. When both therapists gave the same instructions, groups performed comparably, suggesting that therapist variables did not explain the differences between the groups.
  
  
  CONCLUSIONS
  Instructions on the PCE have an effect on performance.
authors.affiliation: Department of Psychiatry & Psychology, The Cleveland Clinic Foundation, OH 44195, USA. Schemaj@ccf.org
authors.forename: J
authors.initials: J
authors.lastname: Scheman
authors.forename: E C
authors.initials: EC
authors.lastname: Covington
authors.forename: T
authors.initials: T
authors.lastname: Blosser
authors.forename: K
authors.initials: K
authors.lastname: Green