balance (bal'ans) [Fr. balance fr. L. bilanx, bilancia, double scale]
1. A device for measuring weight; a scale.
A condition in which the intake and output of substances such as water and nutrients are approx. equal; a state of equilibrium. See: homeostasis
3. Coordination and stability of the body in space. Normal balance depends on information from the vestibular system in the inner ear, from other senses such as sight and touch, from proprioception and muscle movement, and from the integration of these sensory data by the cerebellum.
The chemical equilibrium that maintains the body's pH at about 7.40; i.e., at the concentration of hydrogen ions that is most favorable to routine cellular metabolic processes. The equilibrium is maintained by the action of buffer systems of the blood and the regulatory (homeostatic) functions of the respiratory and urinary systems. Disturbances in acid-base balance result in acidosis or alkalosis. See: pH
A very sensitive scale used in chemical analysis.
The number of calories consumed as food, minus the calories expended, e.g., during exercise.
When consumption exceeds expenditure, a positive energy balance is present, and weight is gained. When consumption is less than energy expenditure, a negative energy balance is present, weight is lost, and risk factors for cardiovascular disease diminish.
Regulation of the amount of liquid in the body. A negative fluid balance (fluid deficit) may occur when fluids are lost by vomiting, diarrhea, bleeding, or diaphoresis. Fluid overload may result from the excessive administration of intravenous fluids, or in diseases marked by impaired fluid excretion, such as congestive heart failure, cirrhosis, or renal failure. See: dehydration
; fluid replacement
; and entries beginning with the words fluid volume
Treatment of fluid imbalances depends on the cause; the patient's cardiac, renal, and hepatic function; measured serum electrolytes; and acid-base balance.
Useful means of gauging changes in fluid balance are 1) to measure fluid inputs and outputs; or 2) to measure day-to-day variations in body weight.
A harmonious blend of occupational, familial, social, and leisure pursuits. Synonym: role balance; work-familybalance work-life balance
Comparison of the intake and excretion of a specific nutrient. The balance may be negative when an excess of the nutrient is excreted or positive when more is taken in than excreted.
The difference between the amount of nitrogen ingested and that excreted each day. If protein intake is greater than the nitrogen excreted, a positive balance exists; if protein intake is less, there is a negative balance. Synonym: nitrogen equilibrium
; nitrogenous equilibrium
Equilibrium between protein intake and anabolism, and protein catabolism and elimination of nitrogenous products. See: nitrogen equilibrium
role balance Synonym: Life balance
static balanceStatic equilibrium.
work-family balanceLife balance.
work-life balance See: Life balance