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in vivo studies; dual-energy X-ray absorptiometry; magnetic resonance imaging; anthropometric measurements; histidine; biomarkers; nitrogen; skeletal muscle; chemical analysis; models; body composition; human health; creatinine; potassium; bioelectrical impedance; computed tomography; metabolites
body composition; anthropometric measurements; bioelectrical impedance; electric current; principal component analysis; angle of incidence; electrical resistance; frequency; capacitance
Thamnophis; autumn; body composition; body length; body weight; hibernation; latitude; lipids; rehydration; seasonal variation; snakes; spring; starvation; summer; temperature; water content; winter
Abstract:
... At northern latitudes the garter snake (Thamnophis sirtalis parietalis) undergoes a prolonged period of hibernation and has access to food only from mid—May to mid—September. An examination of seasonal changes in the body composition of this organism revealed that protein and ash, expressed as percentage of total body weight, remain essentially constant throughout the year. Lipids are low in the s ...
nutrient-nutrient interactions; nickel; copper; iron; nutrient availability; dietary mineral supplements; animal growth; blood chemistry; nutrient deficiencies; body weight; body composition; heart; kidneys; liver; rats
Abstract:
... In two fully-crossed, three-way, two-by-three-by-three, factorially arranged experiments, female weanling rats were fed a basal diet supplemented with iron at 15 and 45 μg/g, nickel at 0, 5, and 50 μg/g, and copper at either 0, 0.5, and 5 μ/g (Expt. 1) or 0, 0.25, and 12 μg/g (Expt. 2) A gram of basal diet contained in Expt. 1 approximately 16 ng of nickel, 2.3 μg of iron, and 0.47 μg of copper; a ...
bicycling; exercise; body composition; gamma radiation; potassium; isotope labeling; athletes; human health
Abstract:
... Vigorous exercise has been reported to increase the apparent potassium content of athletes measured by whole body gamma ray scintillation counting of 40K. The possibility that this phenomenon is an artifact was evaluated in three cyclists and one nonathlete after exercise on the road (cyclists) or in a room with a source of radon and radon progeny (nonathlete). The apparent 40K content of the thig ...
nutritional status; men; electrolytes; potassium; analytical methods; body fat
Abstract:
... A method which involves the measurement of bioelectrical resistive impedance (R) for the estimation of human body composition is described. This method is based upon the principle that the electrical conductivity of the fat-free tissue mass (FFM) is far greater than that of fat. Determinations of R were made in 37 healthy men aged 28.8 +/- 7.1 yr (mean +/- SD) using an electrical impedance plethys ...
Microtus pennsylvanicus; body composition; boreal forests; demographic statistics; extinction; males; mortality; population dynamics; principal component analysis; reproduction; small mammals; social behavior; spring; summer; surveys; traps; voles; winter; Manitoba
Abstract:
... The population cycles of meadow voles (Microtus pennsylvanicus) were studied in southeastern Manitoba, Canada, from 1968 to 1978 on a 32—ha old field and in surrounding boreal forest. Vole density was monitored on mark—recapture live—trapping at 2— to 4—wk intervals throughout the year. This was supplemented by a 3—d spring and a 30—d summer snap—trapping survey. Multiannual and annual fluctuation ...