causal
Analysis v1
Strong Support
The stronger the untrained arm gets, the more consistently its motor nerves fire during effort—this tight link shows that better nerve signaling, not muscle growth, is why the arm gets stronger.
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Evidence from Studies
Supporting (1)
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Community contributions welcome
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Cross-education: motor unit adaptations mediate the strength increase in non-trained muscles following 8 weeks of unilateral resistance training
Randomized Controlled Trial
Human
2024When people trained one arm, their other arm got stronger too—and this happened because their brain and spinal cord sent stronger signals to the muscles, even without training them.
Contradicting (0)
0
Community contributions welcome
No contradicting evidence found