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

Training
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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).

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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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