. A recent comprehensive review in two parts. Particular emphasis on VO2max, manipulation of work and rest periods to maximise time at VO2max. Are the intervals you're currently doing optimal? Programming considerations. https://esthermorencos.files.wordpress. ... puzzle.pdf
The second part of that review, dealing with anaerobic intervals and programming, is a swine to link to but is available on pdf if you look.
A review on sprint intervals because I like them and I like it: http://www.fisioex.ufpr.br/resources/BE ... S-2010.pdf
(In case you worry that what's true for runners and cyclists may not necessarily apply to rowers, VO2 kinetics (fancy!) are broadly similar across those modalities: https://www.researchgate.net/publicatio ... _intensity
Not much research in this area, though.)