Changing programs and body adaptation
So from reading stuff on lifting (lots of what Greg Nuckols posts on strengtheory) I get the idea that your body gets "used" to what you're doing. Its why eventually (and that could be a long long time) you plateau and need to change up your approach, add volume, etc. to advance even doing a solid well rounded program.
I'm not talking silly daily muscle confusion stuff, just that your body is pretty elastic in its response to stressors.
I personally had no experience with this as I'd been running a fairly standard program steadily since last August (and previously). In November I switch to a high frequency/high intensity program for a couple months for something different and to deal with the holiday chaos.
HF/HI means you lift pretty much daily for a good % of your 1 rep max. I eased into the program without much issue and it helped me a lot with my bench and squat and was a fun change of pace for a bit.
Fast forward to this Monday. I get back in the gym after a week of vacation (including far more mixed drinks than healthy) and get back into my old program on a new track.
I about died.
Ok, maybe a bit hyperbolic, but holy crap, I tapped out halfway through my accessory work and waddled to the treadmill to do some walking. I was wiped.
My body was wondering "WTF dude? I'm not used to this many reps at a time. What are you doing?" I was battling the vestiges of a cold and the creatine had flushed from my system last week, but to a large degree my muscles were not used to the rep load, especially 2 or 3 exercises targeting the same muscle groups. It was also weird waking up Tues & Wednesday having muscle soreness. Something I didn't really have the past couple months.
Anyway, just felt like rambling, er sharing about it.
Anyone else have a similar experience where you completely changed up your approach and were surprised by your body's reaction?