The Claim
In resistance-trained individuals, the magnitude of strength gains differs significantly between similar exercises (e.g., squat versus hack squat) when training volume and frequency are held constant, demonstrating that strength adaptations are exercise-specific and not a universal physiological response.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
When people who regularly lift weights perform different exercises with the same number of sets and frequency, they gain different amounts of strength depending on the exercise, showing that strength gains depend on the specific movement performed.
See the scientific wording
In resistance-trained individuals, the magnitude of strength gains varies significantly between similar exercises (e.g., squat vs. hack squat) despite identical training volume and frequency, indicating that strength adaptations are highly exercise-specific and not a universal trait.
When a person performs a specific movement like a squat or hack squat, the brain and nerves learn the exact muscle activation timing, joint angles, and force directions needed for that movement. The body strengthens the neural connections for that exact pattern, so strength gains only happen for that specific movement, not for similar ones.
What the research says
1 studyEven when people do the same amount of workout, they get stronger faster on some exercises like the hack squat than others like the regular squat — because your body learns each movement differently, not just gets generally stronger.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.