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Diurnal Variations in Upper and Lower Body Power in Adolescent Volleyball Players: Exploring Time-of-Day Effects on
Nebojša Trajković1, Vladan Milić2, Tomislav Đurković3
1Faculty of Sport and Physical Education, University of Niš, 18000 Niš, Serbia.
Sports (Basel, Switzerland)
|December 27, 2024
Summary
Adolescent volleyball players show improved lower body power in the evening. Upper body power, particularly in standing medicine ball throws, also saw improvements, suggesting training later in the day may be more effective.
Area of Science:
- Sports Science
- Exercise Physiology
- Adolescent Sports Performance
Background:
- Understanding daily fluctuations in athletic performance is crucial for optimizing training and competition schedules.
- Adolescent athletes may exhibit unique diurnal variations in physical capabilities due to ongoing developmental processes.
Purpose of the Study:
- To investigate the diurnal variations in upper and lower body power performance in adolescent male volleyball players.
- To determine if performance in specific power tests differs between morning and evening testing sessions.
Main Methods:
- Fifty male adolescent volleyball players (mean age 14.12 ± 0.8 years) participated in the study.
- Lower body power was assessed using vertical jump tests, and upper body power using medicine ball throws.
- Testing was conducted twice daily: once in the morning (8:00-9:30 h) and once in the evening (18:00-19:30 h).
Main Results:
- Significant improvements in vertical jump performance (lower body power) were observed in the evening compared to the morning (p < 0.05, ES = 0.35-0.42).
- The standing medicine ball throw (upper body power) also showed significant improvement in the evening (p = 0.05, ES = 0.35).
- No significant differences were found for counter movement jump with arm swing or lying and seated medicine ball throws between morning and evening sessions.
Conclusions:
- Lower body power in adolescent volleyball players is significantly enhanced in the evening.
- Upper body power, specifically assessed by the standing medicine ball throw, also demonstrates diurnal variation, peaking in the evening.
- These findings suggest that optimizing training and testing schedules for adolescent volleyball players, particularly for leg power, may be more beneficial in the afternoon or evening.
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