Strength training is an indispensable part of the preparation of high-performance athletes. Available information relates both to interference and additive effects of supplementary strength training on endurance performance. The purpose of this review is to describe and consider the impact of strength training (ST) on physiological variables and sport-specific performance of athletes from various endurance sports. In total, 57 professional publications were selected and analysed using various electronic databases such as Google, SIRC, PubMED. The study outcomes evidenced that supplementary strength training may produce both stimulatory and interference effects depending on various environmental and physiological factors. A substantial part of relevant publications confirms additive effects of supplementary strength training. An additional option to avoid interference is associated with the implementation of Block Periodization planning approach, which presupposes separation of highly concentrated strength and endurance workloads within appropriate block mesocycles.
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