AI Article Synopsis
- The study investigates how neuromuscular function varies between older individuals with multiple sclerosis (pwMS) and healthy controls (HC) across different age groups (young, middle-aged, and old).
- Findings revealed that pwMS exhibited significantly reduced muscle strength (Fmax), rate of force development (RFD), and voluntary activation (VA) in knee extensors (KE) compared to HC, with greater declines observed in the plantar flexors (PF) as they aged.
- The results indicate that both MS and age negatively impact muscle function, particularly in PF, with unique patterns of decline between pwMS and HC, suggesting a need for further research into the neural mechanisms behind these deficits.
Article Abstract
Background: The prevalence of older (>60 years) people with multiple sclerosis (pwMS) is increasing. This introduces numerous challenges, as both MS and ageing independently contribute to the deterioration of neuromuscular function.
Aim: The aim was to compare the neuromuscular function in pwMS and healthy controls (HC) across three age groups: young, middle-aged, and old.
Methods: Using a cross-sectional study design, the maximal muscle strength (Fmax) and rate of force development (RFD) of the knee extensors (KE) and plantar flexors (PF) were assessed using an isokinetic dynamometer. In addition, voluntary activation (VA) and resting twitch (RT) were measured using the interpolated twitch technique.
Results: The Fmax, RFD, and VA of the KE were reduced in pwMS compared to HC across age groups. In pwMS, reductions were observed in PF Fmax, RFD, and RT, predominantly in the middle-aged and old age groups. Reductions increased with age in KE for both groups (except for VA) but in PF only for pwMS. The "trajectory" differed between pwMS and HC, as pwMS showed reductions from young to middle age, while HC showed reductions from middle to old age in KE.
Conclusion: The combined negative effects of MS and ageing on neuromuscular function were especially present in the PF but also substantial in the KE. RFD showed large deficits for pwMS compared to HC across age groups. The findings can partly be explained by a reduction in VA and RT, but further investigations of neural regulation are needed to explain large RFD deficits.
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| http://dx.doi.org/10.1016/j.exger.2023.112339 | DOI Listing |
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