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• W4291142023 abstract "BACKGROUND Increased work of breathing or fatigue of respiratory muscles has been suggested to reduce exercise performance.PURPOSE The present study investigated the effects of continuous inspiratory resistive breathing (IRB) on the responsiveness of corticospinal pathway innervating the vastus lateralis (VL) to determine whether respiratory muscle fatigue affects the central motor output to exercising limb muscles.METHODS Eight subjects underwent a 6-min IRB trial three times (IRB1–3) in two experiments. During each IRB trial, the subjects performed voluntary hyperventilation through a mask attached with an inspiratory resistive load (approximately 30% of maximal inspiratory pressure (PImax)). In Experiment 1, PImax was measured at baseline and after each IRB trial. In Experiment 2, VL responses to transcranial magnetic stimulation (motor evoked potentials (MEPs) and cortical silent periods were assessed during 5 s isometric knee extension at an intensity of 15% of the maximal voluntary contraction over the same time course as in Experiment 1.RESULTS PImax decreased from baseline after IRB2 and IRB3 (P < 0.05). MEPs increased from baseline after IRB1 and IRB2 (P < 0.05), whereas MEPs after IRB3 were not significantly different from baseline. Cortical silent periods did not change from baseline after IRB1 and IRB2, whereas cortical silent periods after IRB3 increased from baseline (P < 0.05).CONCLUSION These results suggest that as inspiratory muscle fatigue progresses, the corticospinal tract controlling the lower limb muscles can shift from excitatory dominance to inhibitory dominance as a whole, affecting the central motor output to working limb muscles." @default.
• W4291142023 created "2022-08-13" @default.
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• W4291142023 date "2022-07-03" @default.
• W4291142023 modified "2023-09-27" @default.
• W4291142023 title "Influence of continuous inspiratory resistive breathing trials on corticospinal excitability of lower limb muscles during isometric contraction" @default.
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• W4291142023 doi "https://doi.org/10.1080/21641846.2022.2112443" @default.
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