Friday, Jul 24, 2026 The claims desk. Receipts included. POWERED BY LENZ ↗
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The Claim

Squats result in greater vastii hypertrophy compared to leg extensions.

Verified by Lenz ·

The Short Version

The best evidence shows squats produced greater hypertrophy in the vastus lateralis (especially at a distal site) compared with leg extensions, while leg extensions favored rectus femoris. But this does not demonstrate greater hypertrophy across the whole “vastii” group (including vastus medialis/intermedius). The claim overstates the evidence.

Caveats

  • Overgeneralization: evidence cited mainly supports a regional vastus lateralis advantage, not all vastii muscles.
  • Most supporting links are secondary summaries of the same single study and don’t add independent confirmation.
  • Wording ambiguity (“vastii” plural) implies broad superiority that the available measurements don’t establish.

The Receipts

  1. Comparison of Muscle Hypertrophy and Strength Adaptations Between Back Squat and Leg Extension

    PubMed Central (NIH)

  2. Do Compound Lifts Really Do It All? Squats vs. Leg Extensions

    biolayne.com

  3. Squats vs. Leg Extensions For Quad Growth: New Study - StrengthLog

    StrengthLog

  4. Leg Extensions vs Squats for Quadricep Growth - Bulk Nutrients

    Bulk Nutrients

  5. Why leg extensions are a better quad exercise than squats

    Menno Henselmans

  6. Squats vs. Leg Extensions: What Science Says About Building Bigger Legs

    ELI5 Health

  7. Bigger Quads: This NEW Study is Epic - YouTube

    YouTube

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