Secular trends in health-related physical fitness among 11-14-year-old Croatian children and adolescents from 1999 to 2014.

Sci Rep · 2021 · PMC8155011 · PMID 34040133

Europe PMC DOI

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a positive trendno p-value reported

In both sexes, we observed a positive trend of upper-body strength (by using the number of sit-ups in 30 s), which is consistent to previous findings 11 , 12 , 23 , 48 , 49 .

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a negative trendno p-value reported

Our results confirm a negative trend of aerobic fitness in both sexes, which is alarming because low cardiorespiratory fitness is associated with development of numerous diseases and all-cause mortality 1 – 9 .

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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.