Letters to Percent Dear

body

skinfold

thickness

mates

et al (I) recently

ofpercent

body

increasing

amounts

from

arm

from muscle

circumference

puted

axial

from

0.25

0.87.

plus

bone

this

it is evident

bone

area

by CAT

could

(x) (2). that

area values

is y

and

the

reenforces

the

University

of Rochester

Rochester,

experience

r

NY

the

rela-

offat from makes for

individuals.

I appreciate that

the comments

skinfold

underestimation this may be due tissue method

by

the skinfold for determining

by the calipers,

that

the

calipers

than

it is the compress

in lean

experience the

subjects.

of obesity

Insulin

and

agree

will

lead

measurements

obesity ofthe

and

ofthis

skinfold

Another in the between

with

his

to greater

calipers. Though we had the degree of adipose-tissue

considerable variability pression by the calipers degrees

of Dr Forbes

thickness

of body fat with increasing to the amount ofcompression

sion

and that adipose no direct compres-

to a greater

extent

is that

different

skinfold

al (1).

Division

of Diabetes

USC School Los Angeles,

during

total

is

ies of body

composition

of 0.5 of BCM

from periods

their

within

parenteral

interesting

of total

supplementation (BCM) of ‘

stud-

parenteral

flu-

may result in an 15 g/d above that gain

control subjects. If we regard BCM N, this represents an increased nitrogen

g/d.

It is not

showed

no

comparison: differences and 0.9 kg (insulin).

578

during

(TPN) that insulin in body cell mass

seen in nonsupplemented as containing 3.5% tions

(1) conclude

surprising

difference

between

therefore in direct

mean

gains

that

estima-

and

S Gray

Nutrition

authors

Woolfson

that

exogenous

et al (2) in support insulin

oftheir

is beneficial

during

genpar-

in that study of insulin resulted in of ‘-4.3 g/d, repre-

senting

suggested

a nitrogen

and Posner. production

retention

Woolfson rates during

(assuming

insulin Printed

4-5

oftheir differences

four

controlled

concentration in USA.

times

that

by Shizgal

et al showed reductions of mean urea insulin infusion of as much as 22 g/d

transposition the small

We published

1990;52:S78-80.

Downloaded from https://academic.oup.com/ajcn/article-abstract/52/3/578/4650944 by University of Glasgow user on 05 August 2018

quote

enteral feeding in nondiabetics. Comparisons glucose-based feeds with or without added decreases in mean urea production rates

0.8 (control)

J C/in Nuir

with

of Medicine CA 90033

contention

plasma .4,n

problems

nutrition

cry from

group-to-group were

compressibil-

to potential

1. Scherfl, Franklin BA, Lucas CP, Stevenson D, Rubenfire M. Validity ofskinfold thickness measures offormerly obese adults. Am J Clin Nutr l986;43:128-3S.

The

Posner

adipose-tissue

References

Sir: and

leading

in

there

sites

that

loss

calipers to estimate changes in body comporestriction as suggested by Dr Forbes and

Scherfet

degree of adipose-tissue comindividuals with comparable

between

possible

by weight

David

anthropometrist

impression

supplementation

Shizgal

retention

B. Forbes

Center

14642

the use ofskinfold sition during diet

eral

trition increase

Medical

It is also

ity is affected

Dear

nicely

of others.

1. Gray DS, Bray GA, Bauer M, et al. Skinfold thickness measurements in obese subjects. Am I Clin Nutr 1990;Sl:S7l-7. 2. Forbes GB, Brown MR. Griffiths HIL. Arm muscle plus bone area: anthropometry and CAT scan compared. Am I Gin Nutr l988;47: 929-3 1.

mus-

Sir:

obese

satisfactory

individuals

to GB Forbes

Reply

point

obese

References

ranging

larger

in obtaining on

com-

the relative

hence

difficulties

measurements

thickor los-

Box 777

+ O.63x,

underestimation This of course

stated

skinfold gaining

Gilbert

calculated ofx

Gray’s thickness

in body fat from who are either

with been

from

0.375

=

the smaller

scan,

mea-

have

and

weight.

skinfold

comparison

(y)

For

equation

ing

esti-

thickness

published

thickness

(CAT)

the derived

that

on hydrodensitometry disparity increases

cross-sectional

tive fat area, the greater will be the skinfold thickness measurements.

Dear

skinfold

ofa

skinfold

tomography

showing

a finding

the reading

From

plus

from

fat. Such

and

to 0.88,

data

those based indeed the

ofbody

anticipated

ofrelative

presented

fat derived

are lower than men and women;

readily

measurements difficulty in estimating changes ness measurements in individuals

surements in obese

dc

from

Sir:

DS Gray

=

fat derived

1, study

Table seen

by Shizgal

studies during

© 1990 American

ofthe TPN

Society

1 results)-a and

effect

on urea

far

Posner.

of altering production

for Clinical

Nutrition