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The appeal of high-intensity interval training is obvious: Shorter workouts whose health benefits, according to studies in recent years, are nonetheless as effective as much longer sessions of endurance training. Less obvious is just how short the intervals can get — and how this form of training really impacts the body at a cellular level. A new study in The Journal of Physiology might be a step toward settling both questions.
Researchers at the University of Copenhagen and other institutions recruited 12 experienced male cyclists and extracted initial blood and muscle samples from them. The subjects were then put through three
