Increased oxygen uptake in well-trained runners during uphill high intensity running intervals: A randomized crossover testing.

Front Physiol · 2023 · PMC9977817 · PMID 36875023

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highly significantno p-value reported

Also, increasing the slope from flat level running to 7% was found to reduce flight time and increase floor contact time, in turn resulting in highly significant increases in step frequency ( Padulo et al., 2013 ).

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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.