Only the arm you actually train gets a boost in its muscle cells' ability to sustain signals from the brain—your other arm doesn’t get this change.
Scientific Claim
Persistent inward currents (estimated by ∆F) increase only in the trained limb after four weeks of unilateral resistance training, indicating a training-specific neural adaptation.
Original Statement
“∆F increased exclusively in trained limbs [+1.61 ± 0.71 pulse per second (pps); P < 0.001].”
Evidence Quality Assessment
Claim Status
appropriately stated
Study Design Support
Design cannot support claim
Appropriate Language Strength
association
Can only show association/correlation
Assessment Explanation
The claim uses 'increase' as a descriptive observation of measured change, consistent with the abstract’s explicit statement. No causal language is implied, and the finding is directly reported.
More Accurate Statement
“Persistent inward currents (estimated by ∆F) increase only in the trained limb after four weeks of unilateral resistance training.”
Evidence from Studies
Supporting (1)
Only the arm that did the workouts got stronger at the nerve level due to a special electrical boost called persistent inward currents — the other arm got stronger too, but for different reasons.