Biochemical Monitoring of Muscle Recovery in Elite Handball Using an Individualized Approach

Area of Science:

• Sports Medicine
• Biochemistry
• Exercise Physiology

Background:

• Accurate monitoring of muscle recovery is crucial for elite athletes.
• Biomarkers like creatine kinase (CK) and urea are used to assess recovery.
• Current group-based reference ranges may not optimally reflect individual recovery patterns.

Purpose of the Study:

• To evaluate a novel method for individualizing reference ranges for muscle recovery biomarkers.
• To assess the classification performance of individualized versus group-based reference ranges in elite handball players.

Main Methods:

• A longitudinal observational study involving 16 male elite handball players.
• Creatine kinase (CK) and urea levels were measured during the preseason.
• Individualized reference ranges were calculated using a published algorithm and compared to group-based ranges.

Main Results:

• Recovery status significantly affected CK levels (P < .001) but had a smaller effect on urea (P = .018).
• Interindividual variation was significant for CK but not for urea.
• The individualized approach significantly reduced CK error rates (P = .0196).

Conclusions:

• Creatine kinase (CK) is a critical biomarker for monitoring elite handball players.
• Individualizing biochemical monitoring shows promise for improving the accuracy of recovery status classification.
• Further research with larger sample sizes is recommended to validate these findings.