Research

RPE and proximity to failure

• An RPE chart gives a starting weight, not an exact one

  How many reps someone gets at a given percentage of 1RM varies widely between people and between exercises. A single reps × RPE chart therefore gives only a first estimate of the weight for each lift.

  Strong evidence · 3 PubMed sources

• Reps in reserve are usually underestimated

  When people estimate how many reps they have left, on average they guess fewer than they really have. Self-rated RPE should therefore be checked against other data.

  Limited evidence · 1 PubMed source

• Strength does not need training to failure

  Sets that stop short of failure, with clean reps, give the same strength gains as sets taken to failure.

  Strong evidence · 5 PubMed sources

• A small loss of bar speed is enough for strength

  A set stopped once the bar slows a little gives about the same 1RM gain as a set pushed to a large slowdown, with far fewer reps.

  Strong evidence · 7 PubMed sources

Volume, frequency and periodization

• Each extra weekly set adds less

  Strength rises with the number of hard sets per week, but each extra set adds less than the one before.

  Strong evidence · 5 PubMed sources

• Frequency works by spreading volume

  Training a lift two to four times a week works mainly by spreading the same weekly volume over more sessions. With volume equal, extra sessions add little strength.

  Limited evidence · 5 PubMed sources

• One hard set still builds strength

  One hard set per exercise, one to three times a week, still raises 1RM in trained men. More sets give a somewhat larger gain.

  Strong evidence · 2 PubMed sources

• Periodization gives a small edge

  Periodized programs build slightly more 1RM than non-periodized ones. The advantage is small.

  Strong evidence · 5 PubMed sources

Load, rest and beginners

• Loads above 60% of 1RM build more maximal strength

  Training with loads above about 60% of 1RM builds more maximal strength than lighter loads, even when every set goes to failure.

  Strong evidence · 3 PubMed sources

• Trained lifters: rest longer than two minutes

  Trained lifters build more strength with rests longer than two minutes between sets than with short rests.

  Strong evidence · 2 PubMed sources

• Beginners: at equal volume, frequency changes little

  For beginners with weekly volume held equal, one to five sessions a week give similar strength gains.

  Strong evidence · 5 PubMed sources

• Beginners: two to three sets beat one

  For beginners, two to three sets per exercise build more strength than one set.

  Limited evidence · 8 PubMed sources

How to read the grade

Strong evidence

At least one research synthesis (a meta-analysis or systematic review) supports the claim, and none of comparable weight contradicts it.

Moderate evidence

At least two independent randomised trials support the claim, none contradicts it or is inconclusive, and there is no research synthesis yet.

Limited evidence

Research supports the claim, but there is little of it or the studies disagree.

We count resistance training research from PubMed, in the population the claim is about: syntheses (meta-analyses and systematic reviews), randomised trials and other studies. Practitioner opinion is not counted. The summaries are ours; open the original for numbers and detail.