Effects of Microgravity Induced by Parabolic Flight on Ventilation Efficiency and Autonomic Nervous Activity

Int. J. Microgravity Sci. Appl. 2015p320107
Author
Y. HIRAYAMA, T. MAEZAWA, M. TANAKA, A. TSUTOU and H. FUJINO
Organization
Kobe University Graduate School of Health Sciences, Department of Rehabilitation Science, Kobe University School of Medicine Faculty of Health Sciences
Abstract
To clarify the relationship between ventilation efficiency and autonomic nervous activity under microgravity condition induced by parabolic flight, ventilation efficiency, the ratio of abdominal-to-thoracic motion (Vabd/Vrib), the duration of expiratory phase of respiration (TE/TTot) and sympathetic nervous activity were measured in human subjects. Microgravity resulted in a reduction of the ventilation efficiency and increase of sympathetic nervous activity. Furthermore, Vabd/Vrib increased and TE/TTot decreased during microgravity. In addition, we observed using a video-recorder that subject’s trunk was extended during microgravity exposure. These results suggest that the change of subject’s posture might decrease abdominal motion and expiratory phase, and induce increase in sympathetic nervous activity. Thus, autonomic nervous activity does not always play key role to regulate ventilation efficiency in case of exposure to microgravity. Moreover, it is suggested that subject’s posture affects autonomic nervous activity under microgravity condition.
Keyword(s)
Ventilation Efficiency, Autonomic nervous activity, Microgravity
PDF
Download

© The Japan Society of Microgravity Applicaiton

この投稿文は次の言語で読めます: Japanese

ページ先頭に戻る