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The Use of Thermal Infra-Red Imaging to Detect Delayed Onset Muscle Soreness
Published on: January 22, 2012
Sensory and electromyographic mapping during delayed-onset muscle soreness
Nosratollah Hedayatpour1, Deborah Falla, Lars Arendt-Nielsen
1Centre for Sensory-Motor Interaction (SMI), Department of Health Science and Technology, Aalborg University, Fredrik Bajers Vej 7 D-3, Aalborg, Denmark.
Medicine and Science in Sports and Exercise
|January 19, 2008
Summary
Novel mapping reveals delayed-onset muscle soreness (DOMS) affects the quadriceps unevenly. The distal quadriceps region shows greater pain and reduced muscle activity after eccentric exercise, suggesting higher injury susceptibility.
Area of Science:
- Exercise Physiology
- Biomedical Engineering
- Sports Medicine
Background:
- Delayed-onset muscle soreness (DOMS) is a common consequence of eccentric exercise.
- Understanding the topographical variations in DOMS manifestations is crucial for injury prevention and rehabilitation.
Purpose of the Study:
- To employ novel topographical mapping techniques to investigate sensory (pressure-pain thresholds) and electromyography (EMG) responses in the quadriceps.
- To identify site-specific effects of eccentric exercise on muscle function and pain.
Main Methods:
- 11 healthy men underwent eccentric exercise, followed by assessments at 24 and 48 hours.
- Surface EMG and pressure-pain thresholds (PPT) were measured at 15 sites across the quadriceps.
- Subjects performed sustained isometric knee extensions to assess task failure and EMG activity (ARV).
Main Results:
- Task failure duration decreased significantly post-exercise.
- EMG average rectified value (ARV) decreased over time during post-exercise contractions.
- The greatest decrease in ARV and PPT was observed in the distal quadriceps region.
Conclusions:
- Topographical mapping of EMG and PPT reveals site-dependent effects of eccentric exercise on the quadriceps.
- Variations in muscle fiber characteristics likely contribute to these site-specific responses.
- The distal quadriceps region appears more susceptible to DOMS and potential injury following eccentric exercise.
