The Experts below are selected from a list of 279 Experts worldwide ranked by ideXlab platform
John B. Hursh - One of the best experts on this subject based on the ideXlab platform.
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Estimation of Total Body Fat from Potassium-40 Content
Nutrition reviews, 2009Co-Authors: Gilbert B. Forbes, James Gallup, John B. HurshAbstract:On the assumption that the Potassium content of the lean body mass is constant, it should be possible to estimate fat content in living man from a measurement of Potassium-40 activity in the whole-body scintillation counter. A series of such measurements on children and young adults shows good correlations with skin-fold thickness and weight/height ratio as indices of fatness.
Claude Pichard - One of the best experts on this subject based on the ideXlab platform.
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total body mass fat mass fat free mass and skeletal muscle in older people cross sectional differences in 60 year old persons
Journal of the American Geriatrics Society, 2001Co-Authors: Ursula G Kyle, Laurence Genton, Didier Hans, Veronique L Karsegard, Jeanpierre Michel, Daniel O Slosman, Claude PichardAbstract:OBJECTIVES: To evaluate body composition parameters, including fat-free mass (FFM), appendicular skeletal muscle mass (ASMM), relative skeletal muscle mass (RSM) index, body cell mass (BCM), BCM index, total body Potassium (TBK), fat mass, percentage fat mass (FM), and their differences between age groups and to evaluate the frequency of sarcopenia in healthy older subjects DESIGN: Cross-sectional, nonrandomized study. SETTING: Outpatient clinic. PARTICIPANTS: Ninety-one healthy men and 100 healthy women age 60 and older. MEASUREMENTS: FFM, ASMM, FM, and percentage fat mass by whole-body dual-energy x-ray absorptiometry; TBK, BCM, and TBK/FFM ratio by whole body Potassium-40 counter. RESULTS: All lean body mass parameters were significantly (P <.05) lower in subjects age 80 and older than in those age 70 to 79, except ASMM in women. Mean FFM was 4.2 kg (7.3%) lower in men age 80 and older than in those younger than 70 and 2.9 kg (6.8%) lower in women age 80 and older than in those younger than 70. The skeletal muscle mass, reflected by ASMM, decreased more than FFM. This suggests that nonskeletal muscle mass is proportionally preserved during aging. Forty-five percent of men and 30% of women were sarcopenic by definition of BCM index and 11.0% of men and women by definition of RSM index. CONCLUSIONS: Significant age-related differences exist in body composition of older men and women between age 60 and 95. The greater decrease in TBK and BCM than the decrease in FFM and skeletal muscle mass suggests changing composition of FFM with age. Lack of agreement between two independent sarcopenia indexes suggests that further refinement in the definition of a sarcopenia index is necessary.
S K Alausa - One of the best experts on this subject based on the ideXlab platform.
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estimation of annual effective dose due to natural radioactive elements in ingestion of foodstuffs in tin mining area of jos plateau nigeria
Journal of Environmental Radioactivity, 2007Co-Authors: N N Jibiri, I P Farai, S K AlausaAbstract:Abstract Soils and food crops from a former tin mining location in a high background radiation area on the Jos-Plateau, Nigeria were collected and analyzed by gamma spectrometry to measure their contents of 40K, 238U and 232Th. As well as collecting samples, in situ dose rates on farms were measured using a precalibrated survey meter. Activity concentrations determined in food crops were compared with the local food derivatives or diets to investigate the possible removal or addition of radionuclides during food preparation by cooking or other means. Potassium-40 was found to contribute the highest activity in all the food products. The activity concentration of 40K, 238U and 232Th in local prepared diets ranged between 60 and 494 Bq kg−1, between BDL and 48 Bq kg−1 and between BDL and 17 Bq kg−1, respectively. The internal effective dose to individuals from the consumption of the food types was estimated on the basis of the measured radionuclide contents in the food crops. It ranged between 0.2 μSv y−1 (beans) and 2164 μSv y−1 (yam) while the annual external gamma effective dose in the farms due to soil radioactivity ranged between 228 μSv and 4065 μSv.
Gilbert B. Forbes - One of the best experts on this subject based on the ideXlab platform.
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Estimation of Total Body Fat from Potassium-40 Content
Nutrition reviews, 2009Co-Authors: Gilbert B. Forbes, James Gallup, John B. HurshAbstract:On the assumption that the Potassium content of the lean body mass is constant, it should be possible to estimate fat content in living man from a measurement of Potassium-40 activity in the whole-body scintillation counter. A series of such measurements on children and young adults shows good correlations with skin-fold thickness and weight/height ratio as indices of fatness.
Ursula G Kyle - One of the best experts on this subject based on the ideXlab platform.
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total body mass fat mass fat free mass and skeletal muscle in older people cross sectional differences in 60 year old persons
Journal of the American Geriatrics Society, 2001Co-Authors: Ursula G Kyle, Laurence Genton, Didier Hans, Veronique L Karsegard, Jeanpierre Michel, Daniel O Slosman, Claude PichardAbstract:OBJECTIVES: To evaluate body composition parameters, including fat-free mass (FFM), appendicular skeletal muscle mass (ASMM), relative skeletal muscle mass (RSM) index, body cell mass (BCM), BCM index, total body Potassium (TBK), fat mass, percentage fat mass (FM), and their differences between age groups and to evaluate the frequency of sarcopenia in healthy older subjects DESIGN: Cross-sectional, nonrandomized study. SETTING: Outpatient clinic. PARTICIPANTS: Ninety-one healthy men and 100 healthy women age 60 and older. MEASUREMENTS: FFM, ASMM, FM, and percentage fat mass by whole-body dual-energy x-ray absorptiometry; TBK, BCM, and TBK/FFM ratio by whole body Potassium-40 counter. RESULTS: All lean body mass parameters were significantly (P <.05) lower in subjects age 80 and older than in those age 70 to 79, except ASMM in women. Mean FFM was 4.2 kg (7.3%) lower in men age 80 and older than in those younger than 70 and 2.9 kg (6.8%) lower in women age 80 and older than in those younger than 70. The skeletal muscle mass, reflected by ASMM, decreased more than FFM. This suggests that nonskeletal muscle mass is proportionally preserved during aging. Forty-five percent of men and 30% of women were sarcopenic by definition of BCM index and 11.0% of men and women by definition of RSM index. CONCLUSIONS: Significant age-related differences exist in body composition of older men and women between age 60 and 95. The greater decrease in TBK and BCM than the decrease in FFM and skeletal muscle mass suggests changing composition of FFM with age. Lack of agreement between two independent sarcopenia indexes suggests that further refinement in the definition of a sarcopenia index is necessary.