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Compartmental chest wall volume changes during volitional normocapnic hyperpnoea


Illi, Sabine K; Hostettler, Stefanie; Mohler, Evelyn; Aliverti, Andrea; Spengler, Christina M (2011). Compartmental chest wall volume changes during volitional normocapnic hyperpnoea. Respiratory Physiology & Neurobiology, 177(3):294-300.

Abstract

During increased ventilation, inspiratory rib cage muscles have been suggested to take over part of diaphragmatic work after the diaphragm fatigues. We investigated the extent to which this proposed change in muscle recruitment is associated with changes in the relative contribution of chest wall compartments to tidal volume (V(T)). Thirteen healthy subjects performed 1 h of fatiguing normocapnic hyperpnoea. Chest wall volumes were assessed by optoelectronic plethysmography. While breathing frequency increased (43±3 to 56±5 breaths min(-1), p=0.006) and V(T) decreased during normocapnic hyperpnoea (2.6±0.2 to 1.9±0.1l, p<0.001), the relative contribution of chest wall compartments to V(T) remained unchanged (pulmonary rib cage: 48±9 versus 51±14%; abdominal rib cage: 24±4 versus 23±9%; abdomen: 28±8 versus 26±9%; all p>0.05). In conclusion, fatiguing respiratory work is not associated with a change in compartmental contribution to V(T), even in the presence of a change in breathing pattern.

Abstract

During increased ventilation, inspiratory rib cage muscles have been suggested to take over part of diaphragmatic work after the diaphragm fatigues. We investigated the extent to which this proposed change in muscle recruitment is associated with changes in the relative contribution of chest wall compartments to tidal volume (V(T)). Thirteen healthy subjects performed 1 h of fatiguing normocapnic hyperpnoea. Chest wall volumes were assessed by optoelectronic plethysmography. While breathing frequency increased (43±3 to 56±5 breaths min(-1), p=0.006) and V(T) decreased during normocapnic hyperpnoea (2.6±0.2 to 1.9±0.1l, p<0.001), the relative contribution of chest wall compartments to V(T) remained unchanged (pulmonary rib cage: 48±9 versus 51±14%; abdominal rib cage: 24±4 versus 23±9%; abdomen: 28±8 versus 26±9%; all p>0.05). In conclusion, fatiguing respiratory work is not associated with a change in compartmental contribution to V(T), even in the presence of a change in breathing pattern.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > Center for Integrative Human Physiology
Dewey Decimal Classification:570 Life sciences; biology
610 Medicine & health
Language:English
Date:2011
Deposited On:14 Mar 2013 08:08
Last Modified:17 Feb 2018 15:54
Publisher:Elsevier
ISSN:1569-9048
OA Status:Green
Publisher DOI:https://doi.org/10.1016/j.resp.2011.05.007
PubMed ID:21609787

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