Is there true individual variability in strength gains after 6 weeks of resistance training?

Strength Gain Variability1 min readUpdated June 17, 2026

What the Evidence Shows

We analyzed the available evidence and found that individual responses to six weeks of resistance training vary in a way that goes beyond measurement error. Specifically, some untrained adults gained about 1.80 kg more in one-repetition maximum strength than could be explained by random error,...

Evidence from Studies

Supporting (0)
No supporting evidence found
Contradicting (0)
No contradicting evidence found
Primary Studies (1)

Assessing differential responders and mean changes in muscle size, strength, and the cross-over effect to two distinct resistance training protocols.

DOI: 10.1139/apnm-2019-0470

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Published
June 17, 2026·Last updated June 17, 2026
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Is there true individual variability in strength gains after 6 weeks of resistance training? | Evidence-Based Answer | Fit Body Science