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