The Brain-Age Score Got Younger on the MRI. Did the Brain, or Just the Reading?
Exercise can shift some MRI-based brain-age estimates, but changes depend on the model and do not demonstrate literal reversal of brain aging.
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Endorphins Get All the Credit. Is the Runner’s High Really Just about Them?
Exercise changes many chemical signals, but an acute blood measurement cannot establish what happens in every tissue or explain long-term adaptation.