HIIT is commonly performed at about 80 percent of peak heart rate, while sprint intervals are more of an “all-out” effort designed to get you to 100 percent of your VO2 max, the researchers noted.
A recent Finnish study has found that measuring adolescents' maximal oxygen uptake often requires a brief verification phase to ensure reliable results. The researchers also note that even small ...
Learn more about this metric and the best training sessions to add to your schedule to boost your cardio fitness.
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