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Saturday

 

Perception of Muscular Effort During Dynamic Elbow Extension in MS: STUDY




































Image Source: HUMANKINETICS


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.

Story Source: The above story is based on materials provided by ARCHIVESOFPHYSICALMEDICINEANDREHABILITATION
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