I did a 15 mile ride that was reasonably easy to New Mills and back, I burned 590 calories and was in the saddle for 1hr 17m.
Compare that to riding up Winnats Pass (from Speedwell Cavern to the T junction at the top) that is a distance of only 0.85 miles, taking 11m 58s to do it and burning a paltry 132 calories... and it nearly killed me doing it.
Now maybe I am wrong and the clue is in the fact that it "nearly killed me doing it" but surely if I only exercised for 12 minutes (compared to 1h 17m on the New Mills ride) and looking at the calories burned, there's no way doing those short bursts are more beneficial than riding longer in the saddle at an easier pace?
My average Watts on the 15 mile ride was 107 W. On the Winnats Pass ride it was 165 W. This is a massive difference in effort, but for a much shorter time.
GCN did a video about it today: "Improve Your Cycling Endurance Without Riding More" but I can't see how all this "HIIT" stuff isn't just some gimmick. This GCN video didn't provide any scientific (or even non-scientific) backing for the claim that you can improve your cycling endurance without riding more. They just said a fellow GCN presenter "Olly" didn't spend hours in the saddle before doing 1,000 Km in 3 days and he did well. Don't get me wrong I like Olly, I think he has talent.
I truly believe you must ride longer to generally improve in all areas. If that has little bursts of HIIT also mixed in then of course, yes. If we all lived in Holland we'd never have any HIIT unless you start faffing around on the flat in 53x11 and what fun is that?
The arguments I have in my mind is whether doing hard short rides helps you when you do longer easier rides or doing longer easier rides it helps you more on hard short rides. Doing one benefits the other more than the other benefits the other I guess but which way around is it really?
Regardless, I am going to keep mixing it up and doing both, sometimes on the same day.
It's definitely the case though that in recent years (and going back longer) they have been raving about HIIT training - but I am just looking at the actual calories burned and length of the workout. Longer has to mean better?