The Claim

Resistance exercise performed twice weekly for 12 weeks increases leg extension strength by approximately 19–20 kg and leg press strength by 27–39 kg in healthy active older men aged 67 years.

Source: Effects of resistance exercise and whey protein supplementation on skeletal muscle strength, mass, physical function, and hormonal and inflammatory biomarkers in healthy active older men: A randomised, double-blind, placebo-controlled trial.

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports
61score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

Quantitative
1 study reviewed
In plain English

In healthy active men aged 67, performing resistance exercise twice a week for 12 weeks results in an increase of 19–20 kg in leg extension strength and 27–39 kg in leg press strength.

See the scientific wording

Resistance exercise performed twice weekly for 12 weeks increases leg extension strength by approximately 19–20 kg and leg press strength by 27–39 kg in healthy active older men aged 67 years, demonstrating a substantial improvement in lower-body muscular strength.

Why this might work

Lifting weights pulls on muscle fibers, which triggers the muscle to build more contractile proteins and grow larger. This makes the muscle stronger and able to generate more force when it contracts.

Verified mechanismbased on 1 study

What the research says

1 study

  1. Study: Effects of resistance exercise and whey protein supplementation on skeletal muscle strength, mass, physical function, and hormonal and inflammatory biomarkers in healthy active older men: A randomised, double-blind, placebo-controlled trial.

    This study found that older men in their 60s who lifted weights twice a week for three months got much stronger in their legs—exactly as the claim says. They could lift more weight on leg machines, which makes everyday tasks like standing up or climbing stairs easier.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

Fit Body Science verdict — we translate health claims into clear verdicts backed by peer-reviewed research.

Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.