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The purpose of this study was to compare the acute effects of time‐ and effort‐matched high‐intensity intervals on physiological, endocrine, and skeletal muscle molecular variables in elite cyclists. Eight elite cyclists performed short intervals (SI: 30‐seconds) and long intervals (LI: 5‐minutes) with work:recovery ratio 2:1, using a randomized crossover design. SI was associated with 14% ± 3% higher...