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High Reps Vs. Low Reps, The Science!

01dragonslayer

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Higher reps vs lower reps has been a debate for decades among those focused on hypertrophy, such as bodybuilders and casual lifters just looking to add some muscle mass. When people ask me what rep ranges are best for hypertrophy, my typical response is “all of them!”

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Monica shows what smart training, good nutrition, targeted supplements, and good genes looks like!
There’s been a number of studies looking at higher rep ranges using lower loads that support the use of higher reps in programs focused on hypertrophy covered by Monica M HERE worth reading if you have not already. Anything by Monica is always worth reading, but I digress.
In 2018 via Schoenfeld et al, a large meta review of studies examining the topic and using a stringent inclusion and exclusion criteria for the review, that lower reps with higher % of 1RM and higher reps using lower % of 1RM have similar effects on hypertrophy. If the specific goal is improvements in 1RM in a given lift, than higher loads and lower reps is superior, although increases in 1RM strength does take place with higher rep/lower load training.

So should those focused strictly on hypertrophy drop the heavy lifting and just train in the 15-30 rep range? In my opinion, No. Is there a place for higher reps and lower loads in the program of people focused on hypertrophy? That’s a resounding yes! This section from the aforementioned review from summarizes nicely:

“The findings therefore indicate that both heavy and light loads can be equally effective in promoting muscle growth provided training is carried out with a high level of effort. Intriguingly, emerging research shows a potential fiber type-specific effect of loading zones, with heavier loads showing greater increases in type II muscle fiber cross sectional area and lighter loads showing greater increases in type I muscle fiber growth. If true, this implies a potential benefit to training across a spectrum of repetitions when to goal is maximize hypertrophic adaptations. That said, not all studies have found such an effect and further research is therefore needed to draw relevant practical inference…” (1)

Recently, another excellent review also by Schoenfeld et al (2) examined the topic of loading and volume and other variables and the effects on strength, hypertrophy, and muscular endurance, and concludes essentially the same thing: a wide variety of rep ranges can be effective and incorporated into a training program. With respect to hypertrophy, they state:

“…the compelling body of literature indicates that similar whole muscle growth (i.e., muscle thickness, CSA) can be achieved across a wide spectrum of loading ranges ≥ ~30% 1RM. These findings are independent of age and training status. Thus, as a matter of principle, there is no ideal “hypertrophy zone.” From a practical standpoint, however, a case can be made that moderate loads provide the most efficient means to achieve muscle development given that light load training involves performing many more repetitions compared to the use of heavier loads, which in turn increases the time spent training.”

Sumi Singh Fitness Model
So does that put the debate to rest as to the optimal rep ranges for making gainz? No, but it does get us closer to an understanding of what can be effective, and it’s clearly less rigid than once thought. What’s the optimal rep ranges, who should use them (e.g., newbies vs experienced lifters, etc) and when? Lots of Qs yet to be answered, and those papers does bring that up also, so both worth a full read. I’ll also tell you this, if you think training at lower loads for higher reps is the “easy” way out, you have no idea the pain you’re about to experience during the training and the days that follow. Try three sets of squats to failure – close to it – in the 15-20 rep range and get back to me…

infographic showing best ranges for resistance training

Source: Schoenfeld et al. Loading Recommendations for Muscle Strength, Hypertrophy, and Local Endurance: A Re-Examination of the Repetition Continuum. Sports 2021, 9(2), 32;


In conclusion, if hypertrophy is the goal, the inclusion of higher reps appears a viable and likely beneficial addition to a training program and worth some experimentation. My personal preference has been to do higher rep days or phases in a program vs in the same workout as lower reps and higher loads, say 10 reps and below.
 
i was out of the gym for about 6 years. I got fat imo for me atleast. I was about 230 at 6'1. I started back up in August doing higher reps with less time in-between sets. I lost the weight I wanted by December. I was about 190. but I had put on alittle lean muscle. I switched to lower reps with more time between sets in December in hopes of bulking up alittle now that fat was mostly gone. sucks because I got covid and pneumonia so that screwed me. back at it now I feel so weak and gas out fast. I had always thought higher reps was more of aerobic way to lift. to burn calories, guess I was wrong.
 
I have generally found that what eve a person is willing to apply themselves to will work better then what they don't care to do or believe in. So i train the way that i think fits me better.
 
its really a matter of how long you want to be in the gym everyday,.. do lighter weight and lots of reps,, = at gym for 3 hrs.not so dense... lower reps high weights = less time at gym . more density
 

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