Abstract
Objective
To investigate the perception of muscular effort in individuals with multiple sclerosis
(MS) and healthy controls during dynamic contractions.
Design
Case-control study.
Setting
MS day care center.
Participants
Individuals with MS (n=28) and controls (n=28) (N=56).
Interventions
Not applicable.
Main Outcome Measures
Perceived muscular effort during dynamic elbow extensions was rated at 9 different
weight intensities (10%–90% of 1-repetition maximum) in a single-blind, randomized
order using the OMNI-Resistance Exercise Scale. Muscle activity of the triceps brachii
muscle (lateral head) was measured via surface electromyography and normalized to
maximal voluntary excitation.
Results
According to OMNI-level ratings, significant main effects were found for the diagnostic
condition (F=27.33, P<.001, η2=.11), indicating 0.7 (95% confidence interval [CI], 0.3–1.1) lower mean OMNI-level
ratings for MS, and for the intensity level (F=46.81, P<.001, η2=.46), showing increased OMNI-level ratings for increased intensity levels for both
groups. Furthermore, significant main effects were found for the diagnostic condition
(F=16.52, P<.001, η2=.07), indicating 7.1% (95% CI, −8.6 to 22.8) higher maximal voluntary excitation
values for MS, and for the intensity level (F=33.09, P<.001, η2=.36), showing higher relative muscle activities for increasing intensity levels in
both groups.
Conclusions
Similar to controls, individuals with MS were able to differentiate between different
intensities of weight during dynamic elbow extensions when provided in a single-blind,
randomized order. Therefore, perceived muscular effort might be considered to control
resistance training intensities in individuals with MS. However, training intensity
for individuals with MS should be chosen at approximately 1 OMNI level lower than
recommended, at least for dynamic elbow extension exercises.
Keywords
List of abbreviations:
CI (confidence interval), ICC (intraclass correlation coefficient), MS (multiple sclerosis), OMNI-RES (OMNI-Resistance Exercise Scale), 1RM (1-repetition maximum)To read this article in full you will need to make a payment
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Article Info
Publication History
Published online: October 22, 2015
Footnotes
Disclosures: none.
Identification
Copyright
© 2016 American Congress of Rehabilitation Medicine. Published by Elsevier Inc. All rights reserved.
