Abstract:
BACKGROUND:Dual-task (DT) training is gaining ground as a physical therapy intervention in people with Parkinson disease (PD). Future studies evaluating the effect of such interventions need reliable outcome measures. To date, the test-retest reliability of DT measures in patients with PD remains largely unknown. OBJECTIVE:The purpose of this study was to assess the reliability of DT outcome measures in patients with PD. DESIGN:A repeated-measures design was used. METHODS:Patients with PD ("on" medication, Mini-Mental State Examination score ≥24) performed 2 cognitive tasks (ie, backward digit span task and auditory Stroop task) and 1 functional task (ie, mobile phone task) in combination with walking. Tasks were assessed at 2 time points (same hour) with an interval of 6 weeks. Test-retest reliability was assessed for gait while performing each secondary task (DT gait) for both cognitive tasks while walking (DT cognitive) and for the functional task while walking (DT functional). RESULTS:Sixty-two patients with PD (age=39-89 years, Hoehn and Yahr stages II-III) were included in the study. Intraclass correlation coefficients (ICCs) showed excellent reliability for DT gait measures, ranging between .86 and .95 when combined with the digit span task, between .86 and .95 when combined with the auditory Stroop task, and between .72 and .90 when combined with the mobile phone task. The standard error of measurements for DT gait speed varied between 0.06 and 0.08 m/s, leading to minimal detectable changes between 0.16 and 0.22 m/s. With regard to DT cognitive measures, reaction times showed good-to-excellent reliability (digit span task: ICC=.75; auditory Stroop task: ICC=.82). LIMITATIONS:The results cannot be generalized to patients with advanced disease or to other DT measures. CONCLUSIONS:In people with PD, DT measures proved to be reliable for use in clinical studies and look promising for use in clinical practice to assess improvements after DT training. Large effects, however, are needed to obtain meaningful effect sizes.
journal_name
Phys Therjournal_title
Physical therapyauthors
Strouwen C,Molenaar EA,Keus SH,Münks L,Bloem BR,Nieuwboer Adoi
10.2522/ptj.20150244subject
Has Abstractpub_date
2016-08-01 00:00:00pages
1276-86issue
8eissn
0031-9023issn
1538-6724pii
ptj.20150244journal_volume
96pub_type
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