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Little is known about the effect of training on genetic markers for mitochondrial biogenesis in elite athletes. We tested the hypothesis that low-volume sprint interval exercise (SIE) would be as effective as high-volume interval exercise (IE). Ten male cyclists competing on national elite level (Wmax 403 ± 13 W, VO2peak 68 ± 1 mL kg−1 min−1) performed two interval exercise protocols: 7 × 30-s “all-out”...