Secular Trends in Physical Fitness of Children and Adolescents: A Review of Large-Scale Epidemiological Studies Published after 2006.

Int J Environ Res Public Health · 2020 · PMC7459672 · PMID 32764514

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an increasing trendno p-value reported

None of the studies reported an increasing trend of performance.

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a decreasing trendno p-value reported

Twenty-two subsamples, therefore most of the studies, suggested a decreasing trend for the lower limb strength in children and adolescents [ 30 , 32 , 33 , 35 , 36 , 40 , 43 , 44 , 45 ].

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a negative trendno p-value reported

Within the 24 studies included, there were 148 subsamples: 35 subsamples reported an increase of PF, 20 subsamples showed stagnation with no significant changes over the period analyzed, and 93 subsamples found a negative trend in different PF tests.

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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.