File:The number of high-intensity interval-training articles published in 2000–2020.png

English: "In this section, early attempts applying interval training and the main findings of selected HIIT studies are summarized. Since the early 2000s, the number of HIIT studies has gained momentum and increased exponentially. A quick search on PubMed now yields about 300 research articles per year containing “high-intensity interval training”, “sprint interval training”, “repeated sprint training” and “HIIT” in the title (Figure 2). Some HIIT studies to date have significantly contributed to the literature, by showing the physiological and molecular adaptations in response to high-intensity interval exercise intervention in healthy and clinical populations. The training studies included in this section are described in Table 1."