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Published on: May 24, 2017
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Characterizing Soleus Muscle Response to Targeted Plantar Nerve Modulation Using Mechanomyography
1Sonostics, Inc, Endicott, NY, USA.
Summary
Plantar nerve stimulation enhances soleus muscle activity in older adults, reversing age-related atrophy. This noninvasive therapy rejuvenates muscles, improving health and supporting cardiac output during upright posture.
Area of Science:
- Physiology
- Gerontology
- Biomedical Engineering
Background:
- The soleus muscle is crucial for maintaining cardiac output during upright posture.
- Age and disuse cause soleus atrophy, leading to health issues in older adults.
- Exogenous stimulation technology offers potential for soleus muscle rejuvenation.
Purpose of the Study:
- To investigate the influence of plantar nerve stimulation on soleus muscle activity.
- To optimize stimulation technology for soleus muscle rejuvenation in older adults.
Main Methods:
- Mechanomyographic (MMG) spectra were used to characterize soleus muscle dynamics in adults during quiet sitting.
- Soleus spectra from older women (with and without plantar nerve modulation) were compared to those of young adults.
- Plantar nerve modulation was applied to assess its immediate and sustained effects.
Main Results:
- Young men exhibit high tonic soleus activity involving type I and IIa fibers.
- Young women show lower frequency type I and reduced type IIa activity compared to men.
- Older women display reduced type I activity, indicative of disuse atrophy.
- Plantar nerve modulation significantly enhanced soleus activity across the type I fiber spectrum (p < 0.0001).
- Sustained daily modulation in older women improved fiber dynamics, resembling those of young women.
Conclusions:
- MMG analysis confirms plantar nerve modulation enhances soleus muscle performance short- and long-term.
- Noninvasive nerve modulation therapy can rejuvenate soleus muscles, counteracting detrimental health conditions in older adults.
- MMG is valuable for optimizing nerve modulation strategies for soleus muscle applications.
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