Article

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, eta(2)=.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, eta(2)=.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,
eta(2)=.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,
eta(2)=.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.
CI - Copyright (c) 2016 American Congress of Rehabilitation Medicine. Published by
Elsevier Inc. All rights reserved.

Langue : ANGLAIS