scholarly journals Evaluation of the applicability of bioimpedance in the quantification of body fluid compartments

2012 ◽  
Vol 9 (1) ◽  
pp. 67-78
Author(s):  
Lídia Palma ◽  
Ana Rita Alves ◽  
Liliana Tavares ◽  
Carla Monteiro ◽  
Luís Monteiro Rodrigues
Keyword(s):  
Body Fluid ◽  
Body Fluid Compartments ◽  
Fluid Compartments

Determination of Body Fluid Compartments with Multiple Frequency Bioelectric Impedance

1993 ◽  
pp. 23-26 ◽  
Author(s):  
Wm. Cameron Chumlea ◽  
Shumei S. Guo ◽  
Richard N. Baumgartner ◽  
Roger M. Siervogel
Keyword(s):  
Body Fluid ◽  
Multiple Frequency ◽  
Bioelectric Impedance ◽  
Body Fluid Compartments ◽  
Fluid Compartments

Effects of Hemodialysis and Saline Loading on Body Fluid Compartments, Plasma Renin Activity and Blood Pressure in Patients on Chronic Hemodialysis

Nephron ◽  
1977 ◽  
Vol 18 (2) ◽  
pp. 93-100 ◽  
Author(s):  
Frans H.H. Leenen ◽  
Stephen J. Galla ◽  
Gysbert G. Geyskes ◽  
Victor Murdaugh jr. ◽  
Alvin P. Shapiro
Keyword(s):  
Blood Pressure ◽  
Plasma Renin Activity ◽  
Body Fluid ◽  
Plasma Renin ◽  
Chronic Hemodialysis ◽  
Renin Activity ◽  
Saline Loading ◽  
Body Fluid Compartments ◽  
Fluid Compartments

Regulation of body fluid compartments during short-term spaceflight

1996 ◽  
Vol 81 (1) ◽  
pp. 105-116 ◽  
Author(s):  
C. S. Leach ◽  
C. P. Alfrey ◽  
W. N. Suki ◽  
J. I. Leonard ◽  
P. C. Rambaut ◽  
...  
Keyword(s):  
Body Fluid ◽  
Extracellular Fluid ◽  
Plasma Renin ◽  
Capillary Membranes ◽  
Urinary Cortisol Excretion ◽  
Hormone Responses ◽  
Body Fluid Compartments ◽  
Cortisol Excretion ◽  
Fluid Compartments ◽  
Total Body

The fluid and electrolyte regulation experiment with seven subjects was designed to describe body fluid, renal, and fluid regulatory hormone responses during the Spacelab Life Sciences-1 (9 days) and -2 (14 days) missions. Total body water did not change significantly. Plasma volume (PV; P < 0.05) and extracellular fluid volume (ECFV; P < 0.10) decreased 21 h after launch, remaining below preflight levels until after landing. Fluid intake decreased during weightlessness, and glomerular filtration rate (GFR) increased in the first 2 days and on day 8 (P < 0.05). Urinary antidiuretic hormone (ADH) excretion increased (P < 0.05) and fluid excretion decreased early in flight (P < 0.10). Plasma renin activity (PRA; P < 0.10) and aldosterone (P < 0.05) decreased in the first few hours after launch; PRA increased 1 wk later (P < 0.05). During flight, plasma atrial natriuretic peptide concentrations were consistently lower than preflight means, and urinary cortisol excretion was usually greater than preflight levels. Acceleration at launch and landing probably caused increases in ADH and cortisol excretion, and a shift of fluid from the extracellular to the intracellular compartment would account for reductions in ECFV. Increased permeability of capillary membranes may be the most important mechanism causing spaceflight-induced PV reduction, which is probably maintained by increased GFR and other mechanisms. If the Gauer-Henry reflex operates during spaceflight, it must be completed within the first 21 h of flight and be succeeded by establishment of a reduced PV set point.

Shift in body fluid compartments after dehydration in humans

1988 ◽  
Vol 65 (1) ◽  
pp. 318-324 ◽  
Author(s):  
H. Nose ◽  
G. W. Mack ◽  
X. R. Shi ◽  
E. R. Nadel
Keyword(s):  
Body Fluid ◽  
Extracellular Fluid ◽  
Plasma Osmolality ◽  
Free Water ◽  
Inverse Correlation ◽  
The Body ◽  
Free Water Clearance ◽  
Before And After ◽  
Body Fluid Compartments ◽  
Fluid Compartments

To investigate the influence of [Na+] in sweat on the distribution of body water during dehydration, we studied 10 volunteer subjects who exercised (40% of maximal aerobic power) in the heat [36 degrees C, less than 30% relative humidity (rh)] for 90-110 min to produce a dehydration of 2.3% body wt (delta TW). After dehydration, the subjects rested for 1 h in a thermoneutral environment (28 degrees C, less than 30% rh), after which time the changes in the body fluid compartments were assessed. We measured plasma volume, plasma osmolality, and [Na+], [K+], and [Cl-] in plasma, together with sweat and urine volumes and their ionic concentrations before and after dehydration. The change in the extracellular fluid space (delta ECF) was estimated from chloride distribution and the change in the intracellular fluid space (delta ICF) was calculated by subtracting delta ECF from delta TW. The decrease in the ICF space was correlated with the increase in plasma osmolality (r = -0.74, P less than 0.02). The increase in plasma osmolality was a function of the loss of free water (delta FW), estimated from the equation delta FW = delta TW - (loss of osmotically active substance in sweat and urine)/(control plasma osmolality) (r = -0.79, P less than 0.01). Free water loss, which is analogous to "free water clearance" in renal function, showed a strongly inverse correlation with [Na+] in sweat (r = -0.97, P less than 0.001). Fluid movement out of the ICF space attenuated the decrease in the ECF space.(ABSTRACT TRUNCATED AT 250 WORDS)

Sign in / Sign up

Export Citation Format

Share Document