Acute thoracoabdominal and hemodynamic responses to tapered flow resistive loading in healthy adults

Manifield, James, Chynkiamis, Nikolaos, Alexiou, Charikleia, Megaritis, Dimitrios, Hume, Emily, Barry, Gill and Vogiatzis, Ioannis (2021) Acute thoracoabdominal and hemodynamic responses to tapered flow resistive loading in healthy adults. Respiratory Physiology & Neurobiology, 286. p. 103617. ISSN 1569-9048

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We investigated the acute physiological responses of tapered flow resistive loading (TFRL) at 30, 50 and 70% maximal inspiratory pressure (PImax) in 12 healthy adults to determine an optimal resistive load. Increased end-inspiratory rib cage and decreased end-expiratory abdominal volumes equally contributed to the expansion of thoracoabdominal tidal volume (captured by optoelectronic plethysmography). A significant decrease in end-expiratory thoracoabdominal volume was observed from 30 to 50% PImax, from 30 to 70% PImax, and from 50 to 70% PImax. Cardiac output (recorded by cardio-impedance) increased from rest by 30% across the three loading trials. Borg dyspnoea increased from 2.36 ± 0.20 at 30% PImax, to 3.45 ± 0.21 at 50% PImax, and 4.91 ± 0.25 at 70% PImax. End-tidal CO2 decreased from rest during 30, 50 and 70 %PImax (26.23 ± 0.59, 25.87 ± 1.02 and 24.30 ± 0.82 mmHg, respectively). Optimal intensity for TFRL is at 50% PImax to maximise global respiratory muscle and cardiovascular loading whilst minimising hyperventilation and breathlessness.

Item Type: Article
Uncontrolled Keywords: Inspiratory muscle training, Thoracoabdominal volumes, Cardiac output
Subjects: C600 Sports Science
Department: Faculties > Health and Life Sciences > Sport, Exercise and Rehabilitation
Depositing User: John Coen
Date Deposited: 20 Jan 2021 09:39
Last Modified: 27 Nov 2023 13:00

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