Background: In high performance sports, a large variety of training and periodization concepts are used in daily training. However, at present it is unclear which combination of intensity, training duration and training frequency is superior thus producing the best adaptations. A promising, yet poorly scientifically investigated concept is the concept of a polarized training periodization. Methods: Prospective Studies, which examined polarized training compared to other training concepts, were identified from searches in Cochrane Library, EMBASE, Google Scholar, PubMed, SciVerse Science Direct and Web of Science.
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