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>Do any of you know of guidelines backed by (statistically significant) research?
I mean there is a lot about this recently. You can look up, for example, Hear Rate Variability training (for example this write up by Alex Hutchinson https://www.outsideonline.com/health/training-performance/how-heart-rate-variability-tells-you-when-hammer/ ).
This Twitter thread is interesting in this context:
https://mobile.twitter.com/drsianallen/status/1443642546622631942
Also velocity based training is another thing you might look into if you are talking about resistance training. I haven’t tried it but you are supposed to be able to do it using just an iPhone with Carlos Balsalobre’s app:
https://mobile.twitter.com/balsalobrephd
A lot of the sports science people I follow on twitter having been talking about this book recently and if you look at the table of contents there is a chapter on recovery (I’ve ordered the book but don’t have it yet):
https://www.amazon.com/gp/product/1492592900/ref=ox_sc_act_image_1?smid=ATVPDKIKX0DER&psc=1
https://us.humankinetics.com/products/high-performance-training-for-sports-2nd-edition
