Patient selection: nonobese adults (body mass index < 30 kg per square meter; age > 20 years). In theory the score could calculated for an obese adult if the corrected limb circumferences reflect the limb circumference that the patient would have if not obese.
Exclusions: enrolled in structured physical fitness program, recent weight loss, drug or disorder impacting body composition
Parameters:
(1) age in years
(2) gender
(3) race
(4) height in meters
(5) corrected mid-arm girth (circumference) in cm (CAG)
(6) corrected thigh girth (circumference) in cm (CTG)
(7) corrected calf girth (circumference) in cm (CCG)
|
Parameter
|
Finding
|
Points
|
|
gender
|
female
|
0
|
|
|
male
|
1
|
|
race
|
African American
|
1.1
|
|
|
Asian
|
-2.0
|
|
|
Hispanic
|
0
|
|
|
White
|
0
|
corrected circumference in cm =
= ((measured circumference in mm) - (PI() * (skinfold thickness in mm)))/10
where:
• The measured skinfold thickness is 2 times the thickness of skin and underlying fat.
• circumference = PI() * (diameter)
• The equation to correct the circumference removes the effect of the skin and fat layer.
• It is important to use correct anatomic locations and reliable measuring devices.
X =
= (0.00744 * ((corrected arm circumference)^2)) + (0.00088 * ((corrected thigh circumference)^2)) + (0.00441 * ((corrected calf circumference)^2))
skeletal muscle mass in kilograms =
= (X * (height in meters)) - (0.048 * (age in years)) + (2.4 * (points for gender)) + (points for race) + 7.8
Performance:
• R-square was 0.92 and SEE was 2.3 kg.
