Reduced rest duration on SS intervals - Affect on adaptations vs. additional stress?

Comparing 2 extreme examples:

Version 1 - 1x50 minutes @ 90% + 20 minutes in Z1
Version 2 - 5x10 minutes @ 90% with 5 minute rests between each Z1

Comparing the 2 versions, it’s the same time in SS and Z1 zones. Same TSS.

Version 1 is obviously mentally and physically harder, but should be very doable at 90% of threshold.

I feel like version 1 would certainly help train the mental fortitude needed for these kind of intervals, but I was curious what the physical adaptation benefits are. I’m also curious how much additional stress this may cause and whether it’s a good tradeoff (same TSS, but seems like it would create more stress).

If you have events that requires longer work at sweet spot (e.g. long climb), then I’d suggest laddering up as posted here:

actually I think ‘going long’ is good for anyone, but clearly if you are going to do a 1 or 2 hour climb then absolutely train like you are going to ride and extend sweet spot work out to 50 or 60 minutes.

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