Your patient has a triceps skinfold (TSF) of 15 mm and her mid-arm circumference is 28 cm; therefore, her mid-arm muscle circumference is
a. 13 cm c. 27.5 cm
b. 23.3 cm d. 28.47 cm
B
Skinfold thickness measurements provide an estimate of body fat stores or the extent of obesity or undernutrition. It is a more reliable indicator of body fat than is weight because more than half of the body's total fat is located in the subcutaneous tissue. The mid-arm circumference (MAC) provides information on skeletal muscle mass and fat stores. The mid-arm muscle circumference (MAMC) estimates skeletal muscle reserves or the amount of lean body mass. The formula for calculating MAMC is: MAMC (cm) = MAC (cm) - [3.14 ? TSF (cm)]. Your patient's MAMC is 23.3 cm.
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