alt Hacker NewsNitpick: In Tabata's research, "high intensity" meant 170% of VO2max - definitely not easier to do consistently, even if you can voluntarily sustain 170% VO2max. Popular "HIIT" methodology is only loosely inspired by it, and the mechanisms for their merits would be largely unrelated to that of the original Tabata protocol's benefits (which was about demonstrating a way for elite athletes to push anaerobic capacity at the same time as aerobic, not shaving 50 minutes off their cardio routine).
The growing research into how even a small amount of activity can confer significant benefits to the sedentary may be yet another mechanism entirely.
I agree shorter workouts are much easier to stick to though, especially since I'm easily bored.
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Walking up a flight of stairs briskly is way above VO2 max for the vast majority of people, yet doesn't feel "extreme"
>I agree shorter workouts are much easier to stick to though, especially since I'm easily bored.
Walking is one of the best mild exercises, if you can do it in a safe place, where you can't trip or fall into a hole or be mugged (or some other risk), because you can think while walking. So you can use the time to think about your work (if applicable, like for software people, at least in some cases), or your life, or anything else. You can also not think deliberately (although thoughts may come anyway), and just enjoy the walk.
For example, I think about my side projects while walking, and have been surprised to find that I have sometime made good progress on some of them while doing so.
Right. I once experimented with organizing my running workouts according to the original Tabata protocol, as closely as possible, for about six weeks[1]. I wasn't an elite athlete by any means, but I was a 21 year-old Army cadet in the top quartile of cadets in terms of fitness. I found that it's indeed difficult to strike a legitimate 100% effort, even when it's only for 20 seconds and only 5-10 times. My point is not that people should adopt the protocol as a sustainable, long-term routine; it's just that there's been evidence for a long time that short workouts can have disproportionate benefits in addition to being easier to program into day-to-day life.
[1] The results on my running performance, specifically over two miles, weren't clear, by the way. I wasn't running my best times when I started the experiment, nor at the end of it. But at least I didn't get worse despite averaging only six miles per week. I've done much better on 15-25 miles per week with a wider variety of speed work.