Replacing a Swiss ball for an exercise bench causes variable changes in trunk muscle activity during upper limb strength exercises.

Dyn Med · 2005 · PMC1177975 · PMID 15935097

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showed a trendno p-value reported

The bench press exercise showed a trend for muscles to increase their myoelectric signal on the Swiss ball (14 occurrences), while there were only two instances when a muscle's activity decreased more than 5% MVC.

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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.