Lean Body Mass

Course

Anthropometric Measures

Lean Body Mass

Introduction

Height/Weight

Knee Height

Frame Size

Weight for Height

Circumference

Circumference Tables

Body Fat

Body Fat Tables

Abdominal Fatfolds

Anthro Tables

Summary

Resources

Muscle, bone, fluid, and other non-fat tissues are part of the body’s lean tissue compartment. The volume and function of lean body mass is closely associated with wellness, morbidity, and mortality. Loss of lean tissue increases risk of infection and other complications in chronic disease. Efforts to rehabilitate, maintain, and enhance lean tissues can be monitored through anthropometric evaluation.
Estimates of lean tissues can be accomplished by subtracting total body fat weight from total weight as shown in Figure 19 below. Figures 20 and 21 show calculations for mid-arm muscle circumference and upper arm muscle area. Table 10 displays evaluation for mid-arm muscle circumference.

Figure 19. Calculation of Lean Tissue Weight

Lean tissue weight = total body weight – [(total body weight x % body fat)/100]

This calculation can be completed in either kilograms or pounds.

Figure 20. Calculation of Mid-Arm Muscle Circumference

MAMC = MAC – (Pi x TFF)

MAMC = mid-arm muscle circumference in centimeters; MAC = mid-arm circumference in centimeters; TFF = triceps fatfold in centimeters; Pi = 3.14

Figure 21. Calculation of Upper Arm Muscle Area

UAMA = (MAC – [TFF x Pi])2/(4 x Pi)

UAMA = upper arm muscle area in millimeters2; MAC = midarm circumference in millimeters; TFF = triceps fatfold in millimeters; Pi = 3.14

Table 10. Evaluation of Upper Arm Muscle Measures²⁰

Sex	Age	--- 5^th	M 25^th	A 50^th	M 75^th	C--- 95^th	--- 5^th	U 25^th	A 50^th	M 75^th	A--- 95^th
Male	18	245	276	297	321	379	4070	5066	5552	6374	8355
	19-24	262	288	308	331	372	4508	5274	5913	6660	8200
	25-34	271	300	319	342	375	4694	5541	6214	7067	8436
	35-44	278	305	326	345	374	4844	5740	6490	7265	8488
	45-54	267	301	322	342	376	4546	5589	6297	7142	8458
	55-64	258	296	317	336	369	4422	5381	6144	6919	8149
	65-75	248	285	307	325	355	3973	5031	5716	6432	7453
Female	18	222	241	258	281	325	2398	2917	3243	3694	4767
	19-24	221	247	265	290	345	2538	3026	3406	3877	4940
	25-34	233	256	277	304	368	2661	3148	3573	4138	5541
	35-44	241	267	290	317	378	2750	3359	3783	4428	5877
	45-54	242	274	299	328	384	2784	3378	3858	4520	5964
	55-64	243	280	303	335	395	2784	3477	4045	4750	6247
	65-75	240	274	299	326	373	2737	3444	4019	4739	6214

MAMC (mid-arm muscle circumference) is displayed in millimeters; UAMA (upper arm muscle area) is displayed in millimeters2.

But what about the Anthropometric in chronic disease?