Thread: myofibrillar & sarcoplasmic hypertrophy

From what I remember one this, myofibrillar was increasing the cross sections in a muscle making you strong and not bigger. Sacroplasmic is making your muscules retain more fluid and making them look bigger. something like that, do a search I think I made a thread about it a long time ago.

Oh yea, and 15-20 reps would be more endurence do like 7-10 reps for sacroplasmic, and for scaroplasmic train differently. You don't do explosive movements and do slower reps.

Thanks!, I managed to find that thread and the link to a atricle that was in it.
Okay pretty sure I get it now, although the stuff I have read myofibrillar aslo increases size not just strength. If your looking for just strength it's more of a neural thing rather than hypertrophy (1-3 rep range)
myofibrillar -> strength and size through increasing the density of filaments (working in the 4-6 reps range, and a bit of 6-8 rep range with quick sets lasting about 20-30 secondsa).
Sarcoplasmic -> Only an increase of size through increasing sarcoplasm and non contractile proteins, giving you the benefit of more mitochordia in the cell helping with breaking glucose into ATP which will help with protein synthesis and muscular endurance. But if your filaments outgrow your mitochondria then it's harder for your body to produce ATP, which lowers protein synthesis ..

So if working in the 15-20 reps range (or even higher) is more of an 'endurance' then doesn't this techinacally stimulate sarcoplasmic hypertrophy as there is also a long TUT that the muscle goes under?

I think I get it hahaha

Note that you should train in all the rep ranges for bodybuilding purposes to get all sorts of hyperthrophy. Primarily in the 6-12 range of course, but you should do some 1-5 and 15+ stuff too to make all the parts of the muscle grow.

All are BS except this one.


http://www.unm.edu/~lkravitz/Article...pertrophy.html

Myofibrillar hypertrophy is the growth of the myofibrils. I have read that they also split into a greater number of myofibrils as well. The myofibrils contain the sarcomere, which is the functional unit of muscle tissue. This is the one that affects strength, you are correct. It is best achieved through higher intensity weight training with sufficient volume to spark structural adaptations.

Sarcoplasmic hypertrophy is an increase in intracellular fluid volume; the intracellular fluid is called the sarcoplasm, hence the name. So, yes, energy stores go up with this form of hypertrophy as glycogen is contained primarily within the sarcoplasm. This is best achieved when moving closer toward the endurance end of the spectrum.

Both of these lead to an increase in muscle mass.

Originally Posted by CowPimp

I have read that they also split into a greater number of myofibrils as well.

This is the theory of hyperplausia correct?? And has that been proven in humans or is it all still theoretical?

Thanks Cow. I was reading a training article by Lyle Mcdonald where he was mainly talking about this and gave a brief explanation, but I wanted to make sure I completely understood the science behind it.

Originally Posted by PWGriffin

This is the theory of hyperplausia correct?? And has that been proven in humans or is it all still theoretical?

Not quite, no. It's not an actualy increase in the number of muscle fibers, but an increase in the number of myofibrils, which are part of the muscle fibers.

It's not an actualy increase in the number of muscle fibers

That's dictate at birth isn't it? There's no natural way to increase the number of fibers, I think.