تأثير نمط الإيقاع الحيوي اليومي على الجهد البدني و أداء بعض المهارات الهجومية لناشئ الكرة الطائرة

الملخص EN

The study aimed to investigate the effect of the daily biorhythm pattern on the physical effort and the performance of some offensive skills among volleyball players, to identify the relationship between the daily biorhythm pattern and the physical effort and the level of performance of some offensive skills among volleyball players.

The researcher used the descriptive approach, due to its suitability to the nature and purpose of this The research sample was chosen by the intentional method from the volleyball players at the Tanta Sports Club in the Gharbia region who are registered in the records of the Egyptian Volleyball Federation and participating in the Premier League (A) for men for the 2021/2022 sports season, and the size of the sample before applying the basic study was (16) A player and (4) players were excluded because of the difference in their daily biorhythm pattern from the rest of the players, The researcher reached the following conclusions: The pattern of the daily biorhythm of the research sample is affected by the timing of the practice of training in their club.

The daily biorhythm pattern affects the physical effort and the level of performance of some offensive skills of volleyball players.

- The research sample achieved the best results in the measurements of the variables of the physical effort test (under study) during the morning period compared to the evening and noon periods, respectively.

- The research sample achieved the best results in the measurements of offensive skills tests (under study) during the evening period compared to the morning and noon periods, respectively.