PDF(Pubmed)
Abstract：
Social jetlag (SJL), resulting from misalignment between biological rhythms and social schedules, has emerged as a prevalent phenomenon in modern society, particularly among young athletes. However, the effect of SJL on performance is poorly studied. Jump and dynamic balance are two key skills in volleyball, as the first allows the player to perform better both during the offense and defense phase, and the second is fundamental in landing and in injury prevention. Therefore, our aim was to investigate the effect of SJL on jump skill performance and balance in female volleyball players. Thirty female volleyball players (mean age: 17.3 ± 0.88 years) participated in the study. SJL was assessed using the Munich ChronoType Questionnaire (MCTQ), integrated with Jankowsky\'s sleep-corrected formula. Jump skill performance was evaluated using a standardized jump test, the Vertec Jump Test, while balance was assessed with the Y Balance Test. The tests were performed at 09:00 a.m. and at 06:00 p.m. The results revealed that players with greater SJL exhibited decreased jump performance, characterized by lower vertical jump height (p = 0.02). Furthermore, players with lower SJL showed the typical difference between morning and afternoon performance (p = 0.001), demonstrating their synchronization between biological rhythms and social commitments, while no statistically significant difference between the two sessions was shown in players with higher SJL. Regarding balance, no significant association with SJL was found, but the morning session yielded lower results than the afternoon one (p = 0.01). These findings highlight the detrimental impact of SJL on jump skill performance, underscoring the importance of optimizing sleep-wake schedules and circadian alignment to enhance athletic performance. Future research should explore targeted interventions, such as sleep hygiene education, to minimize social jetlag and promote optimal performance in adolescent athletes.
摘要：
社会时差(SJL)，由于生物节律和社会时间表之间的不一致，已经成为现代社会的一种普遍现象，尤其是年轻运动员。然而,SJL对性能的影响研究甚少。跳跃和动态平衡是排球运动中的两项关键技能,作为第一个允许玩家在进攻和防守阶段都表现得更好，第二个是着陆和预防伤害的基础。因此,我们的目的是研究SJL对女子排球运动员跳跃技巧表现和平衡的影响。30名女子排球运动员（平均年龄：17.3±0.88岁）参加了这项研究。SJL使用慕尼黑ChronoType问卷(MCTQ)进行评估，与Jankowsky的睡眠校正公式相结合。使用标准化的跳跃测试评估跳跃技能表现，Vertec跳跃测试,而平衡用Y平衡测试评估。测试是在上午09:00和下午06:00进行的。结果表明，具有较大SJL的球员的跳跃表现下降，其特征是垂直跳跃高度较低(p=0.02)。此外，SJL较低的球员表现出上午和下午表现之间的典型差异(p=0.001)，证明了它们在生物节律和社会承诺之间的同步，而SJL较高的球员在两个赛段之间没有统计学上的显着差异。关于平衡，没有发现与SJL的显著关联，但上午的结果低于下午的结果(p=0.01)。这些发现凸显了SJL对跳跃技能表现的不利影响，强调优化睡眠-觉醒时间表和昼夜节律调整以提高运动表现的重要性。未来的研究应该探索有针对性的干预措施，如睡眠卫生教育，尽量减少社会时差，促进青少年运动员的最佳表现。
