Article

OBJECTIVE: To determine whether the peak heart rate reached during a six-minute
walk test (HR(6peak)) can be used to predict the heart rate determined at the gas
exchange threshold (HR(GET)) during a maximal cardiopulmonary exercise test
(CPET) in patients with cystic fibrosis (CF). To assess the test-retest
reliability of HR(6peak). DESIGN: Case-control and reliability study. SETTING: CF
unit. PARTICIPANTS: Adults with CF (n=23) and age-matched sedentary subjects
(control group, n=17). INTERVENTIONS: Not applicable. MAIN OUTCOME MEASURES:
Six-minute walk test, HR(6peak), CPET, and HR(GET). RESULTS: HR(GET) and
HR(6peak) were not significantly different and were highly correlated in both
groups (CF, r=.91, P<.01; controls, r=.81, P<.01). The mean differences
(HR(6peak)-HR(GET)) for patients with CF and control subjects were, respectively,
-0.9 beats.min(-1) (bpm) and -0.1 bpm, with neither significantly different from
0. The limits of agreements were +/-11 bpm and +/-18 bpm, respectively. HR(6peak)
demonstrated excellent relative reliability (intraclass correlation
coefficient=.93) and was associated with low variability (standard error of
measurement=4.9 bpm) in patients with CF. CONCLUSIONS: HR(6peak) is valid and
demonstrates satisfactory test-retest reliability in patients with CF. These
results might suggest the use of HR(6peak) as a simple alternative method to
individualize exercise prescriptions in this population. Further studies are
needed in a larger cohort of patients to confirm these preliminary findings.
CI - Copyright 2010 American Congress of Rehabilitation Medicine. Published by
Elsevier Inc. All rights reserved.

Langue : ANGLAIS