Within-week and between-week variability of external and internal load demands of professional male volleyball players Lima, Ricardo González Fernández, Francisco Tomás Pereira, Joel Laporta, Lorenzo Castro, Henrique Rebelo, André Filipa Silva, Ana Matos, Sergio Clemente, Filipe Manuel Volleyball Workload External demands Purpose. The aim of the present study was to analyse the within-week variations according to the internal (rate of perceived exertion [RPE], and session-RPE) and external (jump height average, minimum jump, maximal jump, range of jump, number of jumps and density) intensity. Methods. Twelve male elite/international volleyball athletes from the Portuguese 1st division (age: 21.7 ± 4.19 years of age; experience: 6.2 ± 3.8 years; body mass: 85.7 ± 8.69 kg; height: 192.4 ± 6.25 cm; body mass index: 23.1 ± 1.40 kg/m2) participated in this study. The players were monitored over 26 microcycles, 101 training sessions, and 20 matches. To assess the workload, the CR10 Borg scale and an inertial measurement unit (IMU) were used. Results. According to the internal workload, RPE revealed significant differences between MD-4 and MD-2, MD-4 and MD1, MD-3 and MD-1, and MD-2 and MD-1 (p < 0.05). In the same line, session RPE showed significant differences between MD-4 and MD-2, MD-4 and MD-1, MD-3 and MD-2, MD-3 and MD-1, and MD-2 and MD-1 (p < 0.05). On the other hand, the external load demands revealed statistical differences regarding the number of jumps (MD-4 and MD-2, MD-4 and MD-1, MD-3 and MD-1, and MD-2 and MD-1) and the density of the training sessions (MD-4 and MD-1, and MD-2 and MD-1). Conclusions. The primary findings of this study suggest that higher-intensity training sessions tend to occur during the middle of the week, with a tapering effect observed as the competition date approaches. 2024-07-23T09:30:10Z 2024-07-23T09:30:10Z 2023-12-28 journal article Lima R, Fernandez FTG, Pereira J, Laporta L, Castro H, Rebelo A, Silva AF, Matos S, Clemente FM. Within-week and between-week variability of external and internal load demands of professional male volleyball players. Hum Mov. 2023;24(4):25–35. [https://doi.org/10.5114/hm.2023.133918] https://hdl.handle.net/10481/93384 10.5114/hm.2023.133918 eng open access Wroclaw University of Health and Sport Sciences