INTRODUCTION: In volleyball (VB), the quantification of the training load (TL) is based on the number of jumps (Piatti et al., 2021), however the jump height is not considered. The repetition of intense jumps is source of significant mechanical stress and promote the injury occurrence (Bahr and Bahr, 2014). To optimize jump performance and reduce the occurrence of injuries, it`s necessary to monitor and quantify specifically TL in VB (Debien et al., 2018). The aims of this study were (i) to propose a new method for quantifying TL for explosive exercises, (ii) to determine the nature of the relationships between the dynamics of TL and injury occurrence and (iii) to find a limit TL in terms of jumps, above which the risk of injury occurrence become unacceptable, for optimizing the training schedule. METHODS: This study was conducted in 11 male VB players of the French national team (age: 25.5 ± 2.9 years; size: 197.9 ± 7.3 centimeters; weight: 89.7 ± 10.6 kilograms) over a 5-month international competitive period (23 games and 37 specific training). During these sessions, a G-Vert accelerometer(Damji et al., 2021) was used to quantify TL provided by the players during each sessions. The proposed new TL quantification method is based on considering the relative intensities of the jumps according to the maximum jump height (MJH) and the introduction of a weighting factor(Banister and Hamilton, 1985) for high-intensity exercises based on the relationship between the number of possible jumps and their intensities. The relationships between TL dynamics occurrences of injuries were assessed using a variable dose-response model of Busso (Busso, 2003). An injury score was determined based on the injury severity score (Stevenson et al., 2001). RESULTS: A high coefficient of determination was found (r2 = 0.94 ± 0.14, p < 0.001), indicating a strong physiological law between the intensity of the jumps and the constraints imposed. The injury risk was dependent of the dynamics of the TL (r2 = 0.47; mean error = 0.7%; p < 0.001). A number of 12 jumps at >80% of MJH during the game sessions, in addition to the 143 jumps at <80% of MJH, seems to be the daily limit not to be exceeded. CONCLUSION: A new approach makes it possible to quantify explosive exercises and the application of the variable dose-response model offers practical advice for the conduct of the training in VB.
© Copyright 2022 27th Annual Congress of the European College of Sport Science (ECSS), Sevilla, 30. Aug - 2. Sep 2022. Julkaistu Tekijä Faculty of Sport Science - Universidad Pablo de Olavide. Kaikki oikeudet pidätetään. / Kääntänyt https://www.DeepL.com/Translator