Huang MH, Doyle L, Burnham A, Fry DK, Shea K. Predictors of positive outcomes following resistive inspiratory muscle training in non-ambulatory persons with advanced multiple sclerosis.
Mult Scler J Exp Transl Clin 2022;
8:20552173211058862. [PMID:
35634011 PMCID:
PMC9134439 DOI:
10.1177/20552173211058862]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Accepted: 10/22/2021] [Indexed: 11/17/2022] Open
Abstract
Background
Inspiratory muscle training (IMT) using a threshold device improves
inspiratory muscle strength. What factors influence the IMT outcome has not
been examined.
Objective
To identify predictors of the positive outcome following IMT in persons with
advanced multiple sclerosis (PwAMS).
Methods
Inclusion criteria were non-ambulatory PwAMS, Expanded Disability Status
Scale (EDSS) ≥6.5, age >18 years, no acute medical conditions, current
non-smokers, and ability to consent. Participants (n = 38)
performed daily inspiratory exercises using a resistive threshold device for
10 weeks. Baseline measurements included age, sex, body mass index, year
post multiple sclerosis diagnosis, comorbidities, EDSS, Modified Fatigue
Impact Scale-5, and oral Symbol Digit Modality Test. The percentage of
completed prescribed exercise trials (Trials%) during the 10-week
intervention was calculated. Age- and sex-adjusted predicted values of
maximum inspiratory pressure (MIP%pred) and maximum expiratory pressure
(MEP%pred) were obtained before and after the 10-week intervention. Backward
multivariable regression analyses for the primary outcome (MIP%pred) were
conducted.
Results
After controlling for the initial MIP%pred, perceived fatigue at the baseline
and Trial% were significant and independent predictors of MIP%pred after
IMT.
Conclusion
Less fatigue at the baseline and higher adherence to the prescribed exercise
repetitions were positive predictors of the positive outcome following IMT
in PwAMS.
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