View Full Version : Muscle fatigue when using higher reps

01-24-2005, 10:09 PM
I've been noticing that with every set I do (mostly with chest), I have to decrease the weight considerably, especially on my third and fourth sets when I increase my rep range to 8-12.

I don't have this problem so much when my rep range is between 2-6. I'm usually able to stay with the same weight for all 4 or 5 sets, and if I have to decrease the weight, it's no wear near the amount that I have to decrease when using higher reps.

Could this mean that I should increase my reps to 15+ to gain some muscular endurance?

I'm in a fat loss routine right now, so I'm not as worried about some muscle/strength loss, so I figgured that now would as good a time as any to increase my muscular endurance (although I've never realy trained with that high of a rep range before).

01-27-2005, 06:47 PM
I have a similar problem and it is with chest as well. really looking forward to an knowledgeable solution, as this has been an issue for me as long as I can remember.

I know for a fact, that I'm not predominantly fast twitch in my chest, as it would be larger than it is now (which is pretty pathetic). yet, when I do singles or doubles I can keep the weight consistant. Higher reps and I either lower reps considerably each set (even after 1.5 - 2 min. rest) or have to lower the weight.


01-29-2005, 02:18 AM
Among other things, it's probably a question of percentages and of energy systems.

If you drop off from 12 reps to 9 reps from set to set, that's a 25% dropoff. Dropping off from 3 to 2 reps from set to set might not seem as much...but it's more (33%).

Also, if you're nutritionally depleted, it's going to show itself more in "metabolic" sets (6-30 reps) than "neural" sets (1-5 reps); I use these rep ranges and terms with some trepidation but you get my point. How's your diet, how's your creatine levels, how's your carb intake, etc.?

01-29-2005, 10:26 PM
Another adaptation that most weight trainers do not have is a high amount of what are called MCT1 transporters. They transport lactate around the muscle cells for energy (BTW lactate is your bodies primary end product of "glycolysis" not pyruvate in vivo) . This is greatly improved with muscular endurance type exercises.

My advice would be to work at it with high range reps working mostly with trying to gain more reps per set. As erp7e states your energy systems are probably not balanced toward working the higher rep ranges. Once you can get up to 30- 40 reps increase the weight a bit and start over. This should help improve the MCT1 transporters.