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We study Shubnikov-de Haas oscillations in a p-type WSe$_2$ monolayer undervery high magnetic field. The oscillation pattern is complex due to a largespin and valley splitting, in the non-fully-resolved Landau level regime. Ourexperimental data can be reproduced with a model in which the main parameter isthe ratio between the Zeeman energy and the cyclotron energy. The model takesinto account the Landau levels from both valleys with the same Gaussianbroadening, which allows to predict the relative amplitude of the resistanceoscillation originating from each valley. The Zeeman energy is found to beseveral times larger than the cyclotron energy. It translates into a large andincreasing effective Land\'e factor as the hole density decreases, in thecontinuity of the values reported in the literature at lower carrier density.

High magnetic field spin-valley-split Shubnikov-de Haas oscillations in a WSe$_2$ monolayer