Is There a Magical Rep Vary for Hypertrophy?

Most individuals are considerably conversant in the affiliation between train reps ranges and their focused impact on the physique throughout resistance coaching. The heaviest load one can raise at a given weight correlates with maximal energy, whereas something one can do above 20 instances or extra clearly signifies muscular endurance.


Someplace between these two ends of the spectrum, nonetheless, lies muscular hypertrophy. Some coaches and trainers contend that ten reps are the magic quantity, whereas others imagine a spread of Eight-12 is extra correct. So, what’s it? Will I develop big biceps if I do four units of Eight or three units of 12?



Fairly truthfully, it would not matter, there isn’t any magic window, and the reply is extra sophisticated than one might imagine.


How Does One Achieve Muscle?

When you may already be scratching your head questioning why rep ranges aren’t as massive of a deal for gaining muscle as you’d beforehand thought, it is essential to grasp how muscular hypertrophy happens within the first place.


There are three major ways in which one can improve muscle protein synthesis by way of the mTOR pathway leading to an elevated muscle cross-sectional space.1


The primary method is thru elevated muscular rigidity, which happens by way of utilizing a heavy load whereas performing an train by way of a full vary of movement. As a muscle spends extra time beneath a given weight, after which the load will increase, this will increase the time beneath rigidity (TUT).2 By way of the usage of slower tempos, pauses, and elevated weight, one can dramatically improve their TUT in a given train. The second technique to rising muscular hypertrophy is thru muscular injury, most frequently related to extreme soreness or the delayed onset muscle soreness (DOMS) one feels a number of days after a tough coaching session.2
This soreness happens due to small micro-tears throughout the muscle fibers themselves, particularly throughout eccentric and concentric muscle contractions. When given ample time to recuperate and correct diet, the muscle fibers restore themselves and permit one to deal with a barely extra vital stimulus the subsequent time round. The third technique with which muscular hypertrophy happens is thru metabolic stress. This stress usually happens by way of the usage of lighter weights at the next given rep vary and is related to the burning sensation one feels whereas lifting.2
Because the muscle tissues repeatedly contract and loosen up, blood swimming pools and muscle cell swelling happens.1 This metabolic stress restricts blood stream and in the end induces muscle hypoxia, which in flip, permits for the metabolites, akin to lactate and hydrogen ions, to construct. These metabolites induce an anabolic impact, which ends up in molecular cell signaling for elevated hormonal responses on the physique.


Every of those three strategies performs off of each other and must be utilized in a complementary vogue to yield the very best coaching outcomes attainable.


What Issues

Understanding what drives muscular hypertrophy from a physiological standpoint simply explains why subscribing to an arbitrary rep vary is sub-optimal for coaching.


By way of the manipulation of the three beforehand talked about variables, one can management the quantity load they’re coaching with, which is maybe some of the essential issues of all when searching for muscular hypertrophy.


Quantity load is an easy system that you could calculate as:


Units x Reps x Load = Quantity Load

Growing quantity load by way of a correctly periodized program will be sure that extra vital stimulus is being positioned on the physique and in the end driving adaption.



Take, for instance, the beforehand talked about reps/units depend of four x Eight or three x 12. If I lifted four units x Eight reps x 100 lbs, that may be three,200 lbs versus three units x 12 reps x 100 lbs, which might be three,600 lbs.


My three x 12 would doubtless yield extra vital outcomes with all issues being equal, akin to tempo and TUT, as a result of it is a bigger stimulus.


Now think about that I did four units x Eight reps x 150 lbs = four,800 lbs, versus three units x 12 reps x 120 lbs = four,320 lbs. Theoretically, my four x Eight can be higher for muscular hypertrophy.


You possibly can see that the rep vary is just one issue within the equation, that means that elevated quantity load might be achieved in quite a lot of methods with no magic rep vary genuinely present.


What’s fascinating, nonetheless, is that someplace within the Eight-12 rep vary nonetheless seems optimum for inducing muscular hypertrophy as a result of it strikes a stability between reasonable weight at a fairly excessive rep vary.three


Making an attempt to do 50 reps with 10 lbs will solely lead to a 500 lbs quantity load, whereas 5 reps at 100 lbs might obtain the identical lead to much less time.


Conversely, it could take 10 units of 1 repetition at 300 lbs to achieve three,000 lbs.


In distinction, three units of 10 repetitions at 100 lbs would equal the identical quantity load regardless of it requiring a way more prolonged relaxation interval between units for the 300 lbs single repetition units.


Keep in mind, nonetheless, that this pertains to muscular hypertrophy. Quantity load, whereas vital for muscular energy, doesn’t play practically the identical position because it does for gaining muscle.


Moreover, one can solely deal with a lot quantity earlier than one will inadequately recuperate. That’s one other article for one more day.


All in all, I hope that you’ve got a higher understanding of how muscular hypertrophy happens and how one can manipulate your coaching. You should not get caught in a dogmatic routine following an arbitrary rep depend just because that is what you’ve got all the time thought was greatest.


Doing some research and digging for extra in-depth solutions is important if you happen to really need to get a grasp on how coaching works. Thanks for studying, as all the time.



1. J Jones E, Bishop P, Okay Woods A, and Inexperienced J. “Cross-sectional space and muscular energy: a short evaluate.” Sports activities Medication (Auckland, NZ) 38: 987-994, 2008.

2. Hornsby WG, Gentles JA, Haff GG, Stone MH, Buckner SL, Dankel SJ, Bell ZW, Abe T, and Loenneke JP. “What’s the influence of muscle hypertrophy on energy and sport efficiency?” Power & Conditioning Journal40: 99-111, 2018.

three. P. Loenneke J, Dankel S, Bell Z, Buckner S, Mattocks Okay, Jessee M, and Abe T. “Is muscle progress a mechanism for rising energy?” Medical Hypotheses 125, 2019.

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