This study attempted to shed further light on the nature of prephonatory chest wall posturing by means of an investigation of the relative volume changes of the rib cage and abdomen during such posturing in normal young adult men and women. A new form of relative-volume chart was devised that enabled graphic display of the data in terms of selected ranges of relative volume contributions of the rib cage and abdomen. Choice of these ranges, reflected as contiguous segments on the devised chart, was based on differences in functional significance among them. On the basis of the results obtained, it was concluded that prephonatory chest wall posturing is a behavior that varies within and among subjects and is characterized by a wide range of relative volume contributions of the rib cage and abdomen.
Bibliographical noteFunding Information:
Acknowledgment: This work was supported by Grant NS-21574 from the National Institute of Neurological and Communicative Disorders and Stroke.
- Chest wall
- Relative-volume chart
- Rib cage