Soleus activity in post-stroke subjects: movement sequence from standing to sitting

Area of Science:

• Neurology
• Biomechanics
• Motor Control

Background:

• The transition from standing to sitting involves precise modulation of plantar flexor activity, notably the soleus muscle (SOL).
• This muscle activity is crucial for tibial translation and maintaining antigravity function during the initial phase of the movement.

Purpose of the Study:

• To investigate the electromyographic activity (EMGa) of the soleus muscle (SOL) during the initial phase of the standing-to-sitting movement in individuals who have experienced a stroke.

Main Methods:

• Compared SOL EMGa in the ipsilateral (IPSI) and contralateral (CONTRA) limbs of stroke subjects with healthy controls.
• Utilized a force plate to accurately identify distinct phases of the standing-to-sitting movement sequence.
• Electromyographic activity (EMGa) of the soleus muscle (SOL) was analyzed.

Main Results:

• Mean SOL EMGa was lower in both the IPSI and CONTRA limbs of stroke subjects compared to healthy individuals.
• A statistically significant difference in SOL EMGa was observed between the ipsilateral limb of stroke subjects and the limb of healthy subjects (p=0.035).

Conclusions:

• Stroke subjects demonstrate diminished soleus muscle (SOL) electromyographic activity (EMGa) in the ipsilateral limb during the initial phase of sitting down.
• Therapeutic strategies should focus on enhancing postural control in the ipsilateral limb for stroke survivors.