Inter-Limb Muscle Property Differences in Junior Tennis Players.

Area of Science:

• Sports Science
• Biomechanics
• Exercise Physiology

Background:

• Muscle characteristics and side-to-side differences are crucial for athletic performance and injury prevention.
• Tennis involves asymmetrical movements, potentially leading to adaptations in muscle contractile properties.

Purpose of the Study:

• To investigate side-to-side differences and asymmetries in muscle contractile properties among young tennis players.
• To identify specific muscle groups exhibiting significant variations between dominant and non-dominant limbs.

Main Methods:

• Thirty-four young tennis players participated in the study.
• Contractile properties (stiffness, tone, elasticity, time to relaxation) were measured on nine key muscle groups in both dominant and non-dominant extremities.
• Statistical analysis identified significant differences (p≤0.05) and effect sizes.

Main Results:

• Significant differences were observed in stiffness and tone for the biceps femoris (dominant) and vastus medialis (non-dominant).
• Greater tone was noted in the non-dominant pectoralis major.
• Increased time to relaxation was found in the dominant biceps femoris, non-dominant pectoralis major, and gastrocnemius.
• The non-dominant infraspinatus and dominant rectus abdominis showed greater elasticity.

Conclusions:

• Small-to-moderate side-to-side differences in muscle contractile characteristics exist in young tennis players across several muscle groups.
• Passive measurements of relaxed muscle may not fully represent the adaptive changes resulting from tennis gameplay.
• Further research is needed to explore dynamic measures and their correlation with playing-induced adaptations.