thanks everyone for the replies, I appreciate all your inputs.
probably I need to specify: I am not seeking for hypertrophy, more speed/strength and muscular thickness because I also play sports, so I don't want to be too big (note: I am not huge but I am still 95kg x 178 cm)
So my goal is to be able to train with these goals in mind but without overdoing, since I noticed that if I go too heavy I burnout quickly (since it would mean training at least 9x week and I am not a pro, so I got everyday duties..)
Speed is a good goal for me to reach, so doing squats for example with 50-60% would mean for me to do heaps of jump squats, pause squats, etc.. always going atg and exploding from the bottom and maintaining good form.
As MinusTheColon was saying, I thought so, but as I was doing the Bw stuff I was still working with high weights/low reps, so I would exclude the fatigue thing.. even if, I have to admit I am pretty fatigued now and I am taking a break. having said so, I actually think that sometimes taking periods of only bw stuff would be good on my body.. maybe using low loads would be a good trade-off?