An acute eccentric exercise increases circulating myomesin 3 fragments.

Area of Science:

• Exercise Physiology
• Biochemistry
• Sports Medicine

Background:

• Accurate assessment of exercise-induced muscle damage (EIMD) is crucial for athletes and coaches.
• Current biomarkers for EIMD lack specificity or optimal detection timing.
• Novel blood markers are needed to precisely evaluate muscle damage and recovery.

Purpose of the Study:

• To investigate circulating myomesin 3 fragments as a potential novel biomarker for EIMD.
• To assess the time course of myomesin 3 fragment changes following eccentric exercise.
• To correlate myomesin 3 fragment levels with subjective muscle symptoms and established damage markers.

Main Methods:

• Nine healthy males underwent a strenuous one-leg calf-raise exercise protocol (10 sets x 40 reps, 50% body weight load).
• Blood samples were collected pre-exercise and at 2, 4, 24, 48, 72, and 96 hours post-exercise.
• Muscle damage was assessed using a visual analog scale (VAS) for symptoms and plasma myomesin 3 fragment analysis.

Main Results:

• Plasma myomesin 3 fragment levels showed a significant increase at 96 hours post-exercise.
• Elevated myomesin 3 fragment levels positively correlated with visual analog scale (VAS) scores for muscle symptoms.
• The changes in myomesin 3 fragments also correlated with other established biomarkers of muscle damage.

Conclusions:

• Circulating myomesin 3 fragments show potential as a sensitive biomarker for detecting eccentric exercise-induced muscle damage.
• Myomesin 3 fragments may provide valuable insights into the timing and extent of muscle damage and recovery.
• Further research can validate myomesin 3 fragments for practical application in sports science and clinical settings.