Hey guys, I've noticed that when doing heavy squats the biggest limiting factor on my ability to progress seems to be some kind of energy constraint. To explain what I mean, I generally work on my 5 rep max for a few sets, and I notice between each set I am really out of breath and it takes me like 10 mins to catch my breath, and after about 4 sets I can just feel it in my body that it doesnt want to work anymore. If I try to push onward a strange thing happens where my body basically "locks" at about 90% of the ROM and refuses to go any lower. I'm not sure how much of this is mental and how much of it is just that my body is simply out of energy resources. When this state is reached I can lower the weight by 20 lbs, wait 10 minutes, and still can't do 1 rep with full depth. I never encountered this at lower weights or with any other workout and suspect the higher weight using more energy is part of the problem.
I'm not really sure what to do about this. I do a session once every 4-6 days, which hardly seems like it could be too taxing. So I was curious if anyone has any experience with this and how they may have overcome it? I could clean up my diet a bit and its not uncommon for me to get a bad nights sleep, so or course there are the obvious solutions of eat better and sleep better, but I am wondering if I am doing something wrong besides that.