What is Volume-Equated?

What is Volume-Equated?

Volume-equated describes a training comparison in which total training volume is deliberately held constant across the groups or programs being tested. When a coach or researcher wants to know whether training a muscle four times a week beats training it twice a week, comparing results directly is misleading if one group also did more total work — any extra progress could simply come from the added volume, not the added frequency. A volume-equated design solves this by fixing total weekly sets x reps x load first, then varying only the factor under study.

How it works

Researchers first set a target weekly volume per muscle group — for example, 20 sets — then distribute that same total across a different number of sessions, rest lengths, or intensities per group. Because the grand total of sets, reps, and load stays identical, any measured difference in strength or muscle growth between groups can be attributed to the manipulated variable rather than to one group doing more work. This is exactly what studies such as Hamarsland et al. (2022) and Schoenfeld et al. (2014) do when comparing training frequencies or loading strategies, and it's the reason well-designed frequency research consistently finds smaller effects than popular training advice suggests.

The formula

Weekly volume = sets x reps x load, held equal across the groups or programs being compared

Practical takeaway: before deciding a program 'works better' because of its frequency, split, or rest periods, check whether it also prescribes more total weekly sets — that's a volume difference, not a frequency or rest advantage.

How to apply it

• Match total sets: Keep weekly sets per muscle identical across groups (e.g. 20 sets/week) while frequency, split, or exercise order differ between them.
• Match total tonnage: Multiply sets x reps x weight and keep that sum equal across groups — useful when session structure or rep ranges differ.
• Hold intensity constant: Keep the %1RM or rep range the same across groups so each rep represents comparable effort, not just a comparable count.
• Change one variable at a time: Alter only frequency, rest length, or exercise selection between arms while volume and intensity stay fixed, so the result isolates that single factor.

Worked example

Say a coach wants to know whether training a muscle twice a week beats training it four times a week. Here's a volume-equated comparison holding weekly volume at 20 sets.

Both groups land on 20 sets/week — the only real difference is how it's split. Any gap in strength or muscle growth between A and B is attributed to frequency, not to one group doing more work.

Volume-equated vs non-equated comparisons

Good research equates volume before manipulating anything else; a program you find 'better' in practice may simply prescribe more total sets, not a smarter structure.

By goal

• Researchers and coaches designing a test: Equate weekly volume before manipulating frequency, rest, or exercise order so conclusions about that one variable are actually valid.
• Lifters comparing two programs: Before deciding one split 'works better,' check whether it also carries more total weekly sets — that volume difference, not the split itself, may be driving the result.

Common misconceptions

• "More frequent training is inherently better for muscle growth." When weekly volume is equated, Schoenfeld and Grgic's 2019 meta-analysis found no meaningful independent effect of frequency on hypertrophy — frequency mostly matters as a way to fit enough total volume in without excessive fatigue per session.
• "Volume-equated means the programs are otherwise identical." Only total sets x reps x load is matched — rest periods, exercise selection, tempo, and intensity can still differ, and those differences are exactly what the design is built to isolate.
• "Real-world program comparisons are automatically volume-equated." Most gym or app-based program comparisons aren't controlled for volume at all, so a program that looks 'better' may simply prescribe more total work rather than a superior structure.

Related terms

Volume-Equated FAQ

What does volume-equated mean in a fitness study?

It means total training volume — sets x reps x load — was matched between the groups or programs being compared, so any difference in muscle growth or strength gain can be credited to another factor, like frequency or rest, rather than to one group simply doing more work.

Is training frequency important if volume is equated?

Research that equates weekly volume, such as Schoenfeld and Grgic's 2019 meta-analysis, generally finds similar strength and hypertrophy across low and high frequencies — frequency mainly matters as a way to fit enough total volume in without excessive per-session fatigue.

How do I equate volume between two programs?

Multiply sets x reps x load for each program over the same time period and adjust one program's sets or sessions until the totals roughly match, then compare only the specific variable you're testing, such as frequency or rest length.

Why do studies bother equating volume?

Without equating volume, a study comparing variables like frequency or rest can't tell whether a better result came from that variable or simply from one group doing more total work — an uncontrolled confound that would make the conclusion unreliable.

Does a volume-equated study control for exercise selection too?

Not automatically — volume-equated specifically means sets x reps x load is matched. Well-designed studies also control exercise selection, tempo, and rest, but the term 'volume-equated' on its own refers only to the total-work variable.

References

1. Schoenfeld BJ, Ratamess NA, Peterson MD, et al. Effects of different volume-equated resistance training loading strategies on muscular adaptations in well-trained men. J Strength Cond Res, 2014;28(10):2909-2918. PubMed 24714538
2. Hamarsland H, Moen H, Skaar OJ, et al. Equal-Volume Strength Training With Different Training Frequencies Induces Similar Muscle Hypertrophy and Strength Improvement in Trained Participants. Frontiers in Physiology, 2022. PMC8766679
3. Schoenfeld BJ, Grgic J, Krieger J. How many times per week should a muscle be trained to maximize muscle hypertrophy? A systematic review and meta-analysis. J Sports Sci, 2019;37(11):1286-1295. PubMed 30558493
4. American College of Sports Medicine. Progression models in resistance training for healthy adults (Position Stand). Med Sci Sports Exerc, 2009;41(3):687-708. PubMed 19204579