Aspects de la Mecanique Ventilatoire au Cours des Accelerations Transverses

  • Ch. Jacquemin
  • P. Varene
Conference paper


Some Aspects of the Mechanics of Breathing during Transverse Acceleration . The purpose of the paper is to attempt to sum up the experiments and measurements made on man during transverse acceleration (+Gx). The results are discussed in the light of the most widely accepted data and theories relative to the mechanics of breathing.

Clinical exploration of the respiratory function allows us to group all the results, apart from the arterial desaturation, in a restrictive respiratory syndrome, based on a reduction of the vital capacity, with the maintenance of the MEVS/VS (maximum expiratory volume per second/ vital capacity) ratio and a decrease in the maximum breathing capacity per minute (M. B. C.).

However, a thorough analysis will have to be made of the physiological mechanics of this syndrome.

The difficulty of making an accurate estimate of intra-thoracic pressures (oesophageal pressures) makes such analysis a tricky problem. Failing this, other methods enable us to confirm that it is definitely a restrictive syndrome that develops in such circumstances and not an obstructive syndrome.

Forces of inertia cause no change - either in the dynamic work of breathing during artificial respiration (less than or equal to 4G) - or in air way resistance measured by the interrupter method (less than or equal to 7G).

However, these are over-all results and do not allow us to dissociate the regional differences (posterior atelectasis) revealed by radiography.

Assuming a similarity of effects between transverse acceleration and negative pressure breathing one can then make use of theoretical diagrams. These are of assistance in understanding the mechanisms, but mainly serve to emphasize the inadequacy of the data so far collected. In particular, anomalies which are difficult to explain are to be observed on these diagrams in the curves for total respiratory compliance, measured by the relaxation method.

Finally, attention is drawn to the lack of information on the behaviour of the thoraco-abdominal respiratory motor system.


Transverse Acceleration Forward Acceleration Compression Bronchique Syndrome Obstructif Volume Courant 
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Copyright information

© Springer-Verlag/Wien 1965

Authors and Affiliations

  • Ch. Jacquemin
    • 1
  • P. Varene
    • 1
  1. 1.Laboratoire Médico-PhysiologiqueCentre d’ Essais en VolBretigny sur OrgeFrance

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