What question did this study set out to answer?

To determine the mechanical actions, pressure contributions, and neural control coordination of the diaphragm, rib cage, and abdominal muscles during quiet breathing and graded exercise.

October 1, 1997Journal of Applied Physiology

Human respiratory muscle actions and control during exercise

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Authors

AAAndréa AlivertiPolitecnico di Milano SCS. J. CalaThe University of Sydney RDRoberto DurantiAzienda Ospedaliero-Universitaria Careggi

Discussion

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Implication

Physiological study reveals coordinated respiratory muscle mechanics during exercise in healthy men, indicating an out-of-phase control strategy that prevents chest wall distortion.

Key Points

To determine the mechanical actions, pressure contributions, and neural control coordination of the diaphragm, rib cage, and abdominal muscles during quiet breathing and graded exercise.
Evaluated five healthy men during quiet breathing and cycle exercise at 0%, 30%, 50%, and 70% of maximum workload (Wmax).
Measured muscle pressures and calculated compartmental chest wall volumes using three-dimensional optoelectronic tracking of 86 surface markers across the rib cage and abdomen.
From quiet breathing to 70% Wmax, diaphragmatic pressure increased approximately 2-fold, shortening velocity increased 6.5-fold, and diaphragmatic workload increased 13-fold.
Abdominal muscle pressure increased from approximately zero during quiet breathing to equal rib cage muscle pressure while operating 180 degrees out of phase across all exercise intensities.
Gradual inspiratory relaxation of abdominal muscles minimized diaphragmatic pressure and rib cage distortion, enabling the diaphragm to contract quasi-isotonically as a flow generator.

Cite This Study

Aliverti et al. (1997) studied this question.

synapsesocial.com/papers/69dbdcf47d378569a98366f4 https://doi.org/10.1152/jappl.1997.83.4.1256

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October 1, 1997Journal of Applied Physiology

Human respiratory muscle actions and control during exercise

View Full Paper

Ask AI

Bookmark

Authors

AAAndréa AlivertiPolitecnico di Milano SCS. J. CalaThe University of Sydney RDRoberto DurantiAzienda Ospedaliero-Universitaria Careggi

Discussion

Member takes

Implication

Physiological study reveals coordinated respiratory muscle mechanics during exercise in healthy men, indicating an out-of-phase control strategy that prevents chest wall distortion.

Key Points

To determine the mechanical actions, pressure contributions, and neural control coordination of the diaphragm, rib cage, and abdominal muscles during quiet breathing and graded exercise.
Evaluated five healthy men during quiet breathing and cycle exercise at 0%, 30%, 50%, and 70% of maximum workload (Wmax).
Measured muscle pressures and calculated compartmental chest wall volumes using three-dimensional optoelectronic tracking of 86 surface markers across the rib cage and abdomen.
From quiet breathing to 70% Wmax, diaphragmatic pressure increased approximately 2-fold, shortening velocity increased 6.5-fold, and diaphragmatic workload increased 13-fold.
Abdominal muscle pressure increased from approximately zero during quiet breathing to equal rib cage muscle pressure while operating 180 degrees out of phase across all exercise intensities.
Gradual inspiratory relaxation of abdominal muscles minimized diaphragmatic pressure and rib cage distortion, enabling the diaphragm to contract quasi-isotonically as a flow generator.

Cite This Study

Aliverti et al. (1997) studied this question.

synapsesocial.com/papers/69dbdcf47d378569a98366f4 https://doi.org/10.1152/jappl.1997.83.4.1256

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