Light Touch Contact Improves Pain-Evoked Postural Instability During Quiet Standing

Area of Science:

• Neuroscience
• Rehabilitation Medicine
• Biomedical Engineering

Background:

• Pain is known to impair balance and postural stability.
• Sensory feedback plays a crucial role in maintaining upright stance.
• Investigating novel methods to mitigate pain-related balance deficits is important for rehabilitation.

Purpose of the Study:

• To determine if fingertip sensory input can enhance postural stability during experimentally induced pain.
• To assess the effect of tactile attention on balance control under painful conditions.

Main Methods:

• Experimental pain was induced using hypertonic saline injections in healthy volunteers.
• Postural stability was measured using center of pressure (CoP) displacement on a force plate.
• Participants stood with eyes closed, either not touching anything or lightly touching a curtain with their fingertip.

Main Results:

• Experimental pain significantly increased CoP displacement, indicating reduced postural stability.
• Lightly touching a curtain with the fingertip significantly reduced CoP displacement during painful conditions.
• No significant difference in postural stability was observed during light touch between painful and non-painful conditions.

Conclusions:

• Engaging fingertip sensation can improve postural stability in the presence of pain.
• This finding suggests that incorporating tactile feedback into balance exercises may enhance rehabilitation outcomes for pain patients.
• Additional sensory information can be a valuable tool for improving balance during pain.