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HIIT Increases Maximal Oxygen Uptake

High Intensity Interval Training (HIIT) is a popular form a cardiovascular exercise. Like any number of exercise there are more than a couple of variations you can work into your workouts. A study published in the journal Medicine & Science in Sports & Exercise tested 3 different protocols.
All 39 male and female subjects performed 10 sessions of 8 to 10 sets of 60 second all out cycling with 75 seconds of recovery between each bout before being assigned to another 10 sessions of sprint interval training, high volume interval training or periodized interval training.
Compared to a control group of adults who didn’t exercise, all subjects experienced significant increases in maximal oxygen consumption, with the greatest improvement seen in high volume interval training. Cardiac output also improved with no changes in maximal heart rate.