Chronic low back pain and back muscle activity during functional tasks

Area of Science:

• Biomedical Engineering
• Rehabilitation Medicine
• Clinical Biomechanics

Background:

• Low back pain (LBP) patients often display altered trunk muscle recruitment patterns.
• It remains unclear if this maladaptive muscle activation is consistent across various functional activities.

Purpose of the Study:

• To investigate trunk muscle activity in patients with chronic LBP during functional tasks.
• To determine if electromyographic (EMG) activity correlates with kinesiophobia or psychological distress scores.

Main Methods:

• Electromyographic activity of lumbar longissimus, iliocostalis, and multifidus muscles was measured.
• Forty chronic LBP patients and 40 controls performed five functional tasks (lifting, sit-to-stand, stair climbing).
• Correlation analysis was performed with TAMPA and Örebro Questionnaire scores.

Main Results:

• Patients with chronic LBP demonstrated increased back muscle activity across most tasks.
• A significant interaction between group and task indicated task-dependent differences in muscle activation.
• No significant correlation was found between EMG activity and kinesiophobia or Örebro Questionnaire scores.

Conclusions:

• Chronic LBP is associated with generalized increased trunk muscle activity during functional tasks.
• This heightened muscle activity is not directly explained by kinesiophobia or psychological distress as measured.
• Further research may explore the mechanisms and implications of this widespread muscle overactivity in LBP.