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Work of breathing during arm bracing in normal male subjects.

Objective: Although chronic obstructive pulmonary disease patients get relief from their dyspnea by arm bracing, the mechanics of this effect are unknown. This study aimed to investigate the mechanisms by which arm bracing affects dyspnea by measuring the work of breathing (WOB) in the arm bracing p...

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Published in:Canadian Journal of Respiratory Therapy Vol. 56; pp. 65 - 70
Main Authors: Tomoyuki Ogino, Kyoshi Mase, Shigefumi Murakami, Kazuhisa Domen
Format: Journal Article
Published: Canadian Society of Respiratory Therapists 2020
Online Access:View this record in EBSCOhost
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        12059838
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      jtl: Canadian Journal of Respiratory Therapy
      issn: 12059838
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    pubinfo:
      dt: 2020
      vid: 56
      pid: 13751
      pub: Canadian Society of Respiratory Therapists
      place: Ottawa, Ontario
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        183394297
        10.29390/cjrt-2020-012
        183394297
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        atl: Work of breathing during arm bracing in normal male subjects.
      aug:
        au:
          Tomoyuki Ogino
          Kyoshi Mase
          Shigefumi Murakami
          Kazuhisa Domen
        affil: Department of Rehabilitation, Hyogo College of Medicine Sasayama Medical Center, Sasayama, Hyogo, Japan
      sug:
      ab: Objective: Although chronic obstructive pulmonary disease patients get relief from their dyspnea by arm bracing, the mechanics of this effect are unknown. This study aimed to investigate the mechanisms by which arm bracing affects dyspnea by measuring the work of breathing (WOB) in the arm bracing posture. Methods: Six normal male subjects were studied in two standing postures: erect and with their arms braced. For the arm bracing posture, the subjects leaned forward with their arms stretched and rested their hands on a platform. Respiratory frequency was set at 20 tidal breaths/min with the use of a metronome, and tidal volume was set at 1 L by observing the lung volume on a monitor. All the subjects randomly adopted the two postures, and a preset respiratory pattern was measured for 30 s in each posture. Lung volume and flow rate were measured using a hot-wire flowmeter. Esophageal pressure was measured using a 12-cm balloon catheter. The WOB was estimated using modified Campbell diagrams. Results: Lung volume increased and inspiratory resistive WOB decreased, while inspiratory elastic WOB increased significantly with arm bracing compared with that of the erect posture (P < 0.05). Conclusion: Arm bracing posture increases the chest wall expansion thereby increasing the end-expiratory lung volume and decreasing the inspiratory resistive WOB among healthy individuals.
      pubtype: Academic Journal
      doctype: Journal Article
      ougenre: Article
    language: English
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