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. 2018 Feb;30(2):238-241.
doi: 10.1589/jpts.30.238. Epub 2018 Feb 20.

Oxygen cost of thoracic and diaphragmatic breathing during hyperventilation in healthy males

Nobuhisa Ishii  1   2 , Kazuhide Tomita  1   3 , Shinsuke Suetake  3 , Yukako Okuno  3 , Kenta Kawamura  1 , Reiko Takeshima  4 , Hirotaka Ohse  1 , Shigeyuki Imura  5
Affiliations

Oxygen cost of thoracic and diaphragmatic breathing during hyperventilation in healthy males

Nobuhisa Ishii et al. J Phys Ther Sci. 2018 Feb.

Abstract

[Purpose] It is unclear whether diaphragmatic breathing (DB) results in lower respiratory muscle oxygen consumption during dynamic exercise. The purpose of this study was to compare oxygen consumption in the respiratory muscles (VO2rm) with thoracic breathing (TB) and with DB, in healthy males during hyperventilation. [Subjects and Methods] Ten healthy men participated in this study. The subjects sat on a chair with the backrest reclined at an angle of 60 degrees. Respiratory parameters were measured breath by breath, using an expired gas analyzer. Oxygen consumption was measured for three minutes during quiet breathing. Measurements during TB and DB were performed for one minute each, after connecting a rebreather loading device. The breathing pattern was analyzed by inductance plethysmography, using transducer bands placed over the chest and abdomen that recorded thoracoabdominal movements. [Results] Both ΔVO2/body weight and VO2rm decreased significantly with DB when compared to that with TB, during hyperventilation. [Conclusion] DB results in less respiratory muscle oxygen consumption, even during dynamic exercise.

Keywords: Diaphragmatic breathing; Oxygen consumption; Respiratory muscle.

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Figures

Fig. 1.
Fig. 1.
Experimental equipment. Measurements were carried out with an expired gas analyzer and respiratory inductive plethysmography (RIP). The rebreather device was connected to the gas analyzer. The analog signals obtained by the expired gas analyzer and RIP were converted to digital format with a computerized analysis system.
See this image and copyright information in PMC

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