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Measurement of body fluid distribution with posture change using segmental bioelectrical impedance analysis
Author(s) -
Nishimura Naoki,
Sugimoto Naotoshi,
Ohnishi Norikazu,
Matsumoto Takaaki,
Masuo Yoshihisa,
Iwase Satoshi
Publication year - 2017
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.31.1_supplement.lb856
Subject(s) - supine position , bioelectrical impedance analysis , trunk , bed rest , anatomy , abdomen , head down tilt , medicine , body position , body water , body weight , surgery , physical medicine and rehabilitation , body mass index , biology , ecology
Bioelectrical Impedance Analysis (BIA) is adopted as a simple method to measure the body composition including the body fluid volume, muscle volume, and body fat volume in human. Using segmental BIA, we investigated time‐course changes in the body fluid distribution in various body segments with posture change and during −6° head‐down bed rest, regarded as simulated space flight. The body fluid distribution was measured in 9 body segments during the following periods: (1) 15‐minute supine position, (2) 15‐minute standing position, and (3) 60‐minute −6° head‐down bed rest. The body fluid volumes in the forearms and lower limbs gradually increased with posture change from supine to a standing position, but those in the upper arms slightly decreased. In addition, the body fluid volume in the trunk retained a steady state during standing. However, it decreased gradually in one subject and he could not complete the 15‐minute standing position. The body fluid volumes in the arms, abdomen, and lower limbs gradually decreased during the 60‐minute −6° head‐down bed rest, and the decrease was greater in the arms than in the abdomen and lower limbs. In contrast, the body fluid volume in the trunk tended to gradually increase during the −6° head‐down bed rest. It was suggested that segmental BIA provides more information on the indices of orthostatic intolerance.