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Bioelectrical impedance analysis (BIA) is a method for estimating body composition, in particular body fat and muscle mass, where a weak electric current flows through the body, and the voltage is measured in order to calculate impedance (resistance and reactance) of the body. Most body water is stored in muscle.
A wide variety of body composition measurement methods exist. The gold standard measurement technique for the 4-compartment model consists of a weight measurement, body density measurement using hydrostatic weighing or air displacement plethysmography, total body water calculation using isotope dilution analysis, and mineral content measurement by dual-energy X-ray absorptiometry (DEXA). [1]
"Bulk flow" is the movement/flow of an entire body due to a pressure gradient (for example, water coming out of a tap). "Diffusion" is the gradual movement/dispersion of concentration within a body with no net movement of matter. An example of a process where both bulk motion and diffusion occur is human breathing. [2]
Keeping lower body still throughout, rotate the upper body to the left side. That's 1 rep. Sprinter Sit-Up. How to: Start lying on your back with hands by sides and legs extended straight on the ...
Fick's first law relates the diffusive flux to the gradient of the concentration. It postulates that the flux goes from regions of high concentration to regions of low concentration, with a magnitude that is proportional to the concentration gradient (spatial derivative), or in simplistic terms the concept that a solute will move from a region of high concentration to a region of low ...
Accordingly, the increase in fitness following a training session does not stop at the initial fitness level. Instead, the body enters a period of supercompensation during which fitness surpasses the initial fitness level. If there are no further workouts, this fitness level will slowly decline back towards the initial fitness level (shown by ...
Systematic tests have shown that the timing of thermal status is important. Body warmth, promoting high perfusion during ingassing, promotes high inert gas loading, which increases decompression risk. Body warmth during decompression, and the associated higher overall perfusion, promotes high rates of outgassing, and reduces decompression risk.
Neuroplasticity is the process by which neurons adapt to a disturbance over time, and most often occurs in response to repeated exposure to stimuli. [27] Aerobic exercise increases the production of neurotrophic factors [note 1] (e.g., BDNF, IGF-1, VEGF) which mediate improvements in cognitive functions and various forms of memory by promoting blood vessel formation in the brain, adult ...