BODY WATER SPACES AND CELLULAR HYDRATION DURING HEALTHY AGING

Age-related changes in the proportions of intracellular or extra-cellular water to total body water and in the ratio of total body water to fat-free mass are debatable. These are important issues both for medical reasons (dehydration is a threat in the diseased elderly) and for methodological reasons (most techniques for assessing of body composition assume [...]

By |2013-01-31T18:34:20+00:00enero 31st, 2013|Assessment methodologies, Scientific papers|0 Comments

CHRONIC CELLULAR DEHYDRATION IN THE AGED PATIENT

BACKGROUND: As a reduction of water spaces is expected in the elderly because of fat-free mass loss, disease is often associated with increased hydration. The present study compared water spaces and cellular hydration in adults, healthy and diseased aged patients. METHODS: An open study was conducted in 6 geriatric wards and a nutrition laboratory involving [...]

By |2013-01-31T18:34:20+00:00enero 31st, 2013|Assessment methodologies, Scientific papers|0 Comments

EFFECT OF EQUILIBRATED HYDRATION CHANGES ON TOTAL BODY WATER ESTIMATES BY BIOELECTRICAL IMPEDANCE ANALYSIS

The present study was performed to determine how equilibrated fluctuations in hydration affected the validity of bioelectrical impedance analysis (BIA) for body composition assessment. Total body water (TBW) expansion was induced by a 4 d endurance trial and the subsequent water loss was obtained over the recovery period. Twelve healthy men exercised on a cycle [...]

By |2013-01-31T18:34:20+00:00enero 31st, 2013|Assessment methodologies, Scientific papers|0 Comments

TOTAL BODY WATER CHANGES AFTER AN EXERCISE INTERVENTION TRACKED USING BIOIMPEDANCE SPECTROSCOPY: A DEUTERIUM OXIDE COMPARISON

BACKGROUND & AIMS: Bioimpedance spectroscopy (BIS) for the estimation of total body water (TBW) has advantages over isotope dilution techniques, including cost, portability, and ease of use. The aim of the current study was to determine the validity of a BIS device (Imp SFB7) for tracking changes in overfat and obese individuals. METHODS: Sixty overfat [...]

By |2013-01-31T18:34:20+00:00enero 31st, 2013|Assessment methodologies, Scientific papers|0 Comments

URINE OSMOLALITY AND CONDUCTIVITY AS INDICIES OF HYDRATION STATUS IN ATHLETES IN THE HEAT

PURPOSE: The purpose of this study was to determine a quick and easy method for assessment of day-to-day hydration status in athletes in the heat. METHODS: Measurement of the osmolality of the first urine sample of the day collected after wakening but before breakfast established a standardized collection procedure to allow day-to-day comparisons of individuals. [...]

By |2013-01-31T18:34:19+00:00enero 31st, 2013|Assessment methodologies, Scientific papers|0 Comments

ESTIMATING BODY COMPOSITION IN LATE GESTATION: A NEW HYDRATION CONSTANT FOR BODY DENSITY AND TOTAL BODY WATER.

Twenty women underwent body density (DB) measurements using underwater weighing with correction of residual lung volume by nitrogen dilution and total body water (TBW) using isotope dilution of 18O to estimate body composition at 30 wk of gestation. DB and TBW were used as independent variables in the same equation. The hydration constant (HC) of [...]

By |2013-01-31T18:34:19+00:00enero 31st, 2013|Assessment methodologies, Scientific papers|0 Comments

WATER TURNOVER RATES IN SEDENTARY AND EXERCISING MIDDLE AGED MEN

OBJECTIVE--To assess the effect of exercise on water turnover in endurance trained middle aged men. METHODS--Water turnover was assessed using 2H2O as a tracer for water in six exercising and six sedentary middle aged men over seven consecutive days. The exercising subjects ran on average 14.8 km per day, while the sedentary group did not [...]

By |2013-01-31T18:34:06+00:00enero 31st, 2013|Assessment methodologies, Scientific papers|0 Comments

BIOIMPEDANCE ASSESSMENT OF HYPOHYDRATION.

PURPOSE: This study examined the utility of bioimpedance spectroscopy (BIS) for assessing total body water (TBW) changes associated with moderate (6-7% TBW), hypertonic (HH), and isotonic (IH) hypohydration. METHODS: The TBW of nine men was measured using BIS (TBWBIS) when euhydrated (EU) and during HH and IH. These measurements were compared with TBW measurements obtained [...]

By |2013-01-31T18:34:06+00:00enero 31st, 2013|Assessment methodologies, Scientific papers|0 Comments