Handleiding Tanita DC-430MA III (pagina 34 van 40) (Engels)

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Technical Notes (continued)

- Factors giving errors in measurement

In the BIA method, impedance is measured and the body composition is calculated based on the value. It is

known that impedance changes by the amount of the total body water that occupies about 60% of weight

and the change in its distribution and temperature change. Therefore, for the purpose of research or for daily

repeating of measurements, the measurement conditions must be kept constant. Measurement under the

changing conditions of temperature and total body water distribution or blood ow volume of extremities

due to exercising, taking a bath, etc., affects the measurement result since the electric resistance in the body

also changes.

Therefore, it is recommended to measure under the following conditions for stable measurement.

1) 3 hours have passed after getting up and normal lifestyle activities are carried out during this period.

(Bioelectrical impedance remains high if you remain sitting after getting up or drive a car, etc.)

2) 3 hours or more have passed after eating. (For 2 to 3 hours after eating, the impedance has a tendency to

decrease.)

3) 12 hours or more have passed after vigorous exercise for measurement. (The tendency toward changes in

impedance is not stable depending on the type and rigorousness of the exercise.)

4) If possible urinate before taking measurement.

5) For repeated measurements, measure at the same hour as much as possible. (At the same time of

measurement of weight, the measurements can be made more stable by measuring at the same time of the

day)

Very stable measured values can be obtained by measuring under the above conditions.

And in the development of this equipment, the following 6 items were set as conditions for the regression

equation.

1) Prohibition of alcohol intake for 12 hours before measurement

2) Prohibition of excessive exercise for 12 hours before measurement.

3) Prohibition of excessive eating and drinking the day before measurement

4) Prohibition of eating and drinking for 3 hours before measurement

5) Urination just before measurement

6) Avoid measurements during menstruation (for female)

2) Inter-day changes

The diagrams below offer examples of actual measurements made

of inter-day changes. A study was done to determine the degree of

change in the impedance between the feet during dehydration; the

rst two days represent a normal daily routine, while in the latter

two days a state of dehydration was induced using a sauna.

No signicant inter-day change was measured in body weight,

impedance between the feet, or body fat percentage during the

normal daily routine. During the dehydrated state, however, a drop

in body weight of 1kg was noted, with the impedance between the

feet rising approximately 15Ω on the rst day of dehydration and

30 to 35Ω on the second day. As a result, body fat percentage was

up by around 1% on the rst day of dehydration and by 1.5 to 2%

on the second day.

As mentioned earlier, impedance increases when body weight

is reduced (such as by dehydration), and decreases when body

weight is increased through excess consumption of food and drink.

The inter-day change in impedance is thus inversely proportional

to the change in body weight.

Inter-day

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