排泄時のいきみ負荷が循環動態と直腸内圧に及ぼす影響: 重力方向の異なる坐位と仰臥位における時系列解析

第26回宇宙利用シンポジウム(2010年1月25日-26日, 宇宙航空研究開発機構宇宙科学研究本部相模原キャンパス)

The Twenty-sixth Space Utilization Symposium (January 25-26, 2010: ISAS/JAXA Sagamihara, Japan)

To clarify the gravitational effects on strain, 21 healthy subjects were examined how the strain pressure affect heart rate, heart rate variability, blood pressure and intrarectal pressure by different gravitational vector in sitting and supine. The strain was tested by valsalva maneuver(VM), using equipment which connects mouthpieace to blood pressure. The other parameters measured were intrathoracic fluid volume by impedance method, the intrarectal pressure by using catheter into the rectum, and heart rate by ECG and blood pressure by Finapres were recorded simultaneously. These were measured before and during a 15-s VM strain at 10,20,30mmHg of pressure in each, and after VM. The rise in intrarectal pressure during three VM trials in sitting were higher than that in supine. Otherwise the hemodynamics during three VM trials in sitting were also influenced greater than those in supine. We concluded that it was easier to rise intrarectal pressure in sitting, while the influences on hemodynamics were greater in sitting. Defection under microgravity might be easier by increasing the abdomal pressure using other methods with less strain.

形態: カラー図版あり

共催: 日本学術会議

Physical characteristics: Original contains color illustrations

joint hosting: The Science Council of Japan

資料番号: AA0064730048