How many sets does it take to maximize muscle growth?
According to a Youtube video from House of Hypertrophy, the answer may be higher than many lifters expect. The channel examined a new study that tackles one of the most controversial questions in exercise science while addressing a common criticism of high-volume training research.
The discussion centered on whether the additional muscle growth often seen with higher training volumes is genuine hypertrophy or simply temporary muscle swelling.
Part I: The 52-Set Study That Sparked Debate
The video begins by revisiting a controversial 2023 study that pushed training volume to unprecedented levels.
Researchers recruited 31 trained individuals who performed back squats, leg presses, and leg extensions twice per week. One group maintained 22 weekly sets throughout the study, while two other groups progressively increased volume, eventually reaching 42 and 52 weekly sets.
The results showed greater quadriceps growth in the highest-volume group, with strength gains following a similar trend.
However, the findings sparked intense debate. Critics argued that the extra muscle size could have been caused by temporary swelling rather than true muscle growth.
Part II: A New Study Investigates Muscle Swelling
To address these concerns, researchers conducted a new study involving 13 trained lifters.
Participants completed three separate workouts consisting of seven, 14, and 21 total sets of squats, leg presses, and leg extensions. Researchers then measured muscle thickness immediately after training and again at 24, 48, and 72 hours post-workout.
The results were noteworthy.
Despite the large differences in volume, researchers found no significant differences in swelling between conditions. In addition, muscle swelling had largely returned to baseline within 24 hours regardless of the number of sets performed.
As the study authors stated:
“Our results suggest the residual muscle swelling and or edema is unlikely to be a major confounding factor in hypertrophy assessments.”
Part III: Looking at the Bigger Picture
House of Hypertrophy also reviewed previous research examining post-workout swelling.
While some studies have detected swelling up to 72 hours after training, others found it disappeared within a day. More importantly, none of those studies directly compared different training volumes.
The video highlights another key concept known as the repeated bout effect. As the body adapts to training, muscle damage, soreness, fatigue, and swelling decrease over time. This means swelling observed after a single workout may not accurately represent what happens after weeks of consistent training.
Based on the current evidence, House of Hypertrophy concludes that higher-volume programs likely produce real hypertrophy rather than simply creating the appearance of growth through swelling.
Part IV: What About Strength?
A separate meta-regression found that strength gains appeared to plateau at around five weekly sets per muscle group.
Some interpreted this as proof that muscle growth should also plateau at low volumes.
However, the video explains that many strength studies included untrained individuals, who often gain strength rapidly through neural adaptations and improved technique rather than muscle growth alone.
When examining trained lifters and studies measuring both size and strength, higher training volumes generally resulted in larger improvements in both outcomes.
Part V: Practical Recommendations
Although the evidence favors higher volumes for hypertrophy, House of Hypertrophy stresses that more is not always better.
The data show diminishing returns, meaning each additional set contributes progressively smaller gains.
Importantly, the channel emphasizes:
“If you’re currently making great progress with your training program, regardless of how it may look or compare to the research, you don’t have to change a thing.”
For those seeking maximum muscle growth, the recommendation is to perform as much volume as can be recovered from while maintaining high effort and quality execution.
For lifters interested in experimenting with higher volumes, a muscle specialization approach may be the most practical strategy. This involves increasing volume for one or two lagging muscle groups rather than dramatically increasing workload across the entire body.
The Takeaway
The new study provides important evidence against the idea that higher-volume training only creates temporary muscle swelling.
While questions remain regarding the upper limits of effective training volume, House of Hypertrophy argues that the current body of research continues to support a simple conclusion: more hard sets generally lead to more muscle growth, provided recovery and performance remain on track.
About the Author
Jeremiah Oliva
Jeremiah Oliva is a writer passionate about fitness, sports, and active living. He has experience in songwriting and managing content and social media for online radio and magazine platforms.
He covers HYROX, CrossFit®, and competitive fitness, with a focus on performance, mindset, and athlete development.
Outside of writing, Jeremiah trains in boxing, cycles, explores the outdoors with his kids, and plays the guitar.
