Effects of fatigue on motor unit characteristics in isometric elbow contractions across age groups.

Front Neurosci · 2025 · PMC12812920 · PMID 41561622

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did not reach statistical significanceno p-value reported

Although the ANOVA results did not reach statistical significance, the observed trend and moderate effect size ( η p 2 = 0.336) suggest that the changes in the Fatigue × Age interaction were not random but represent a systematic modulation of the common neural drive.

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a decreasing trendno p-value reported

an increasing trendno p-value reported

In the biceps brachii, most adult groups (20–40 years old) exhibited a decreasing trend in discharge frequency after fatigue, while most elderly groups (55–80 years old) and the child group (10–20 years old) showed an increasing trend in discharge frequency. 3.3.

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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.