Test-retest repeatability of strength capacity, aerobic power and pericranial tenderness of neck and shoulder muscles in children - relevant for tension-type headache.

J Pain Res · 2013 · PMC3770627 · PMID 24039446

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showed a trendno p-value reported

Three trials of strength measurements were chosen for data analysis because the results from the third and fourth trial showed a trend of learning and building up more power.

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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.