Article

OBJECTIVE: To analyze the reliability, validity, and determinants of the
incremental shuttle walk test (ISWT) in adults with noncystic fibrosis
bronchiectasis. DESIGN: Cross-sectional study.
SETTING: Outpatient clinic.
PARTICIPANTS: Subjects (N=75; 26 men) underwent, on different days,
cardiopulmonary exercise testing (CPET) and 2 ISWTs, 30 minutes apart. The number
of steps in daily life was recorded. Concurrent validity was tested by the
relation between distance walked with peak load and oxygen consumption (V o2).
INTERVENTIONS: None. MAIN OUTCOME MEASURES: Distance walked (m) was compared
between the first and second ISWTs; greatest distance walked was correlated with
peak load and Vo2peak obtained from CPET, steps per day, and dyspnea evaluated by
the Medical Research Council (MRC) scale; and desaturation was compared between
CPET and the ISWT. RESULTS: Distance walked was equivalent between the first ISWT
(441+/-152m) and the second ISWT (445+/-153m) with an excellent intraclass
correlation coefficient (.995; 95% confidence interval, .99-.997). There were
significant correlations between distance walked and peak load (r=.82), V o2
(r=.72), steps per day (r=.61), and the MRC scale (r=-.69). Age, body mass index,
sex, forced vital capacity (% predicted), dyspnea, and steps per day explained
70% of the variation in distance walked (m) and 60% of the variance when
expressed as percent predicted. Higher desaturation was observed during the ISWT
(-4%+/-4%) than cycling (-2+/-3%) (P<.001). CONCLUSIONS: The ISWT is reliable,
represents functional capacity, and induces greater desaturation than cycling.
Age, body composition, pulmonary function, dyspnea, and physical activity in
daily life are determinants of the distance walked on the ISWT.
CI - Copyright (c) 2014 American Congress of Rehabilitation Medicine. Published by
Elsevier Inc. All rights reserved.

Langue : ANGLAIS