Arnt Erik Tjønna, (left) a postdoctoral fellow at the Norwegian University of Science and Technology’s KG Jebsen Centre for Exercise in Medicine/Cardiac Exercise Research Group (CERG) tests a healthy volunteer for his maximal oxygen uptake (VO2max).
Regular training improves maximal oxygen uptake (VO2max), which is a well-established measure of physical fitness.
However, just how much exercise, and how intense that exercise should be to deliver the biggest benefit remains to be defined. Now, researchers from the KG Jebsen – Centre of Exercise in Medicine at the Norwegian University of Science and Technology (NTNU) in Trondheim have found that just three short high-intensity sessions (AIT) per week can make for substantial differences in the fitness of inactive men. Their results have just been published in PLOS ONE.
“Our data suggest that a single bout of AIT performed three times per week may be a time-efficient strategy to improve VO2max”, says Arnt Erik Tjønna, a postdoctoral fellow at the center and lead author of the study. Tjønna says one of the advantages of this approach is that it is easy for people to incorporate into their daily lives.
The researchers measured changes in VO2max and traditional cardiovascular risk factors in 24 inactive but otherwise healthy overweight men after they completed a 10-week training session that involved three weekly high-intensity interval sessions. One group of 13 followed a protocol that has previously shown to be effective, consisting of four intervals of 4 minutes of high intensity exercise at 90% of maximal heart rate (HRmax) interspersed with 3 minutes of active recovery at 70% HRmax (4-AIT), commonly known as 4×4 training.
The other group followed a protocol that consisted of one 4-minute interval at 90% HRmax (1-AIT).
After training, VO2max increased by 10% in the group that had just one high-intensity session three times a week (1-AIT), while the group that followed the 4×4 regime increased its VO2max by 13%. Both groups saw decreases in their blood pressure, but the 1-AIT the group’s blood pressures showed greater decreases than their 4-AIT counterparts for both systolic and diastolic readings.
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