Thanks, that's interesting to know. Honestly, I'm a bit intimidated by the prospect of using a stationary bike for REHIIT because aside from occasional use of a stationary bike in Crossfit more than a decade ago (like maybe a half dozen times spread out over 2 years), I haven't done any sort of cycling since I pedaled around campus as an undergrad. It would probably be excellent as a lower body strength builder for me, and I suspect there would be a period of adaptation in that regard before I'd really get into the heart of the metabolic/cv benefit. But along with the dread comes the allure in pushing myself.Ego wrote: ↑Thu May 29, 2025 8:25 amWhile what I have been doing in the spin classes is not strictly REHIIT, I can say for sure that after the third class on Tuesday I was absolutely gutted to the point where I decided to skip it today and allow my body to acclimate to the new modality. Over the past year of travel I have not done any short burst, all-out sprints, so it will take time for me to adjust. The classes are at 6am. After the classes, throughout the day I felt a mental and physical twitchiness that I have not felt since my days of doing running track workouts, and at night my legs were twitching as if I were still pedaling. I think this is due to some neuromuscular stress from the short bursts of effort that is not present in the lower intensity work. ... but then again, what do I know? So, while I cannot say exactly what it is doing, I can say it is doing something different that anything else I do.
In my attempt to approximate REHIIT on my C2 rower I didn't really feel any affects outside the activity like you describe. I suspect that could be because what you're doing is a better approximation. It appears that the idea of REHIIT has been around in academia for 50 years or so already. The original studies required a copilot of sorts to adjust the bike's tension in real time while the subject just focused on the sprint. Apparently it's taken the advent of "AI" and auto-adjusting equipment to replicate the studied protocol. Because of what happened with my so-so approximation I'm a believer that even approximations are beneficial even if they don't achieve the same level of bang-per-minute as the laboratory (or high tech) implementations. I'm very interested to learn how it goes for you if you decide to give it time. Sorry if you've mentioned this here or over in your journal, but are you intending to do the sprints 3x per week?
One thing that has recently occurred to me is that the period of time I was most diligent about quasi REHIIT rowing coincided with my best 4 month stretch of sleep, especially if I look at REM and Deep numbers. There were several changes that broke in at the same time so it's hard to say whether the quasi-REHIIT had any bearing whatsoever. But it's something I'll be watching in the fall once I decide what my program will look like and I get started in earnest.