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Diurnal Variations in Upper and Lower Body Power in Adolescent Volleyball Players: Exploring Time-of-Day Effects on Performance

Nebojša TrajkovićFaculty of Sport and Physical Education, University of Niš, 18000 Niš, SerbiaVladan MilićStudy Program of Sport and Physical Education, Department of Biomedical Sciences, State University of Novi Pazar, 36300 Novi Pazar, SerbiaTomislav ĐurkovićFaculty of Kinesiology, University of Zagreb, 10000 Zagreb, CroatiaTomica RešetarFaculty of Kinesiology, University of Zagreb, 10000 Zagreb, CroatiaGeorgiy KorobeynikovDepartment of Martial Arts and Power Sports, National University of Physical Education and Sport, 03150 Kyiv, Ukraine

2024en

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Litsenziya: cc-by

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Annotatsiya

BACKGROUND/OBJECTIVES: This study aims to investigate the daily variations in upper and lower body power performance in adolescent volleyball players. METHODS: The sample consisted of 50 young male volleyball players (14.12 ± 0.8 years), actively involved in regular training and competition. Players were tested for vertical jump tests and medicine ball throws twice, once in the morning (8:00-9:30 h) and once in the evening (18:00-19:30 h). RESULTS: > 0.05). CONCLUSIONS: This study demonstrated that lower body power, manifested in vertical jump performance, was significantly better in the evening compared to the morning. For upper body assessments, the standing medicine ball throw appears more reflective of volleyball-specific movements, while the lying and sitting throw may be less applicable. These findings suggest that volleyball training and testing, especially for leg power, may be more effective later in the day, while upper body performance appears less affected by time.

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DOI: 10.3390/sports12120320

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