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If that promotes the development of fast-twitch muscle fibres in growing foetuses, that could add to the Jamaican edge. The truth is, we donât have enough information to draw firm conclusions about the Jamaican dominance of sprinting. But there is good reason to dig deeper â and it has nothing to do with athletics. We now have evidence that extreme stress, heat, cold, malnutrition and pollution (including tobacco smoke) trigger changes in the way genes are activated or silenced.
Most of the research, however, has been done on sprinting, which, judging by treadmill row at rush hour, is the most relatable method of cardio for most gym-goers. So while many of the same benefits can be had adding HIIT stylings to your next workout of choice, sprinting is a sure bet for max results. âSprinting workouts arenât effective just for fat loss but also for muscle growth,â Grinnell says.