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Overview :
The fat free mass in adults over 60 years of age may be
overestimated if equations are used that were developed in younger adults. This
reflects the changes in bone, water distribution and muscle that occur as people
age.
Population studied: Adults from 60 - 83 years of age, with 35
healthy men and 37 healthy women
Method for measuring body impedance:
(1) The
body impedance was measured using a body composition analyzer (type BIA 101, RJL
Systems).
(2) Patient
preparation: at least 2 hours after the last meal, with the bladder emptied and
in the supine position.
Equation 1 (page
5)
fat free mass in kilograms =
= (0.360 * (10^4) * ((height in meters)^2) / (resistance in
ohms)) + (0.359 * (body weight in kilograms)) + (4.5 * (gender value)) - (20 *
(thigh circumference in meters)) + 7.0
Equation 2 (page
5)
fat free mass in kilograms =
= (0.671 * (10^4) * ((height in meters)^2) / (resistance in
ohms)) + (3.1 * (gender value)) + 3.9
where:
• The gender value = 0 if female, 1 if male.
• Thigh circumference is measured just below the gluteal
fold.
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