Lee et al developed several anthropometric models for predicting skeletal muscle mass in an adult. One of these models relies on 3 standard limb circumference measurements. The authors are from Columbia University in New York City and Queen's University in Kingston, Canada.
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.
Purpose: To estimate the skeletal muscle mass of a nonobese adult using the anthropometric equation of Lee et al using limb circumferences, height, and race.
Objective: other testing
ICD-10: ,
