Neuroprotective Effects of Physical Activity: Evidence from Human and Animal Studies.

Front Neurol · 2017 · PMC5439530 · PMID 28588546

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highly significantno p-value reported

A meta-analysis revealed a highly significant positive association between IGF-I levels and cognitive functioning in older adults ( 71 ).

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.