Morphologic and mechanical basis of delayed-onset muscle soreness

Area of Science:

• Exercise physiology
• Muscle biology
• Pain research

Background:

• Unaccustomed eccentric exercise causes skeletal muscle damage and soreness.
• This process involves cytoskeletal disruption, inflammation, and tissue remodeling.
• Previous research has identified mechanical and cellular events in muscle injury and repair.

Purpose of the Study:

• To synthesize current understanding of muscle injury from eccentric exercise.
• To explore the mechanical and cellular mechanisms of exercise-induced muscle damage.
• To review neurophysiological pain mechanisms in skeletal muscle.

Main Methods:

• Analysis of recent studies on eccentric exercise in animal models.
• Review of neurophysiological investigations into skeletal muscle pain.
• Integration of findings on mechanical and cellular events in muscle injury and repair.

Main Results:

• Eccentric exercise triggers a cascade of muscle cytoskeletal breakdown and inflammation.
• Muscle remodeling occurs, leading to reduced injury and soreness upon subsequent exercise.
• Neurophysiological studies have clarified pain signaling pathways in damaged muscle.

Conclusions:

• Eccentric exercise-induced muscle damage is a complex process involving mechanical stress, cellular events, and inflammation.
• The injury-repair cycle results in muscle adaptation and increased resistance to subsequent damage.
• Improved understanding of these mechanisms paves the way for targeted therapeutic interventions to enhance recovery.