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I believe this is the study for those interested. I’ve not actually read the paper but table 2 gives the training durations of the different plans (6-7hrs/week)
That said, the effectiveness of a polarised approach for low volume training is something I think needs more exploration. Personally @10hrs/week I try to adopt a polarised approach with 2 intensity sessions during the week (~90tss with work at FTP or above) with longer (2+hr runs, 3-4hr bike) zone 1 sessions on the weekend.
Soon I’m going to have to cut my overall volume so I’ll probably loose some of the longer weekend sessions and add in another high intensity day.
A lot of people miss the fact that Seiler didn't design a training philosophy, he just observed across elite sports that large proportion of training time was very low intensity.
If you are training 4-6 hours a week, should you copy elite athletes with 20-30 hours a week?
What is the point where you need to go easy more so as not to affect how much intensity you do...dunno. 12+ hours? 15+ hours?