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Comparison caloric loads
Karen R Segal, Albert

of thermic effects in lean and obese
Edaflo, Lorna Blando, and

of constant men13
FXavier Pi-Sunyer

and

relative

ABSTRACT might be related
blunted thermogenesis

Controversy to differences
in obesity,

regarding among
responses

relative
in
± 27

load,
(L) vs 683

which
and

was

35%

ofeach

defectivethermic effect of food (TEF) in obesity studies in the caloric loads.clarify To further the role of to the same absolute caloric load (720 kcal) and a subject’s resting metabolic rate (RMR), were compared

1 1 lean

1 1 obese(0)

± 21 kcal; 1±

SEM,

men. The relative load was slightly larger for 0 than NS). TEF, calculated as 3-h postprandial minus fasting

L (752 RMR,
Downloaded fromwww.ajcn.org by guest on June 28, 2011

was greater for L than 0 for both the 720-kcal ± (69 vs 3 1 ± 3 kcal/3 4 h, 28% body fat. All subjects were healthy with no personal or family history of diaMaximal [maximum oxygen consumption (VO2max)] and betes mellitus or other metabolic disease, or cardiovascular dis- submaximal aerobic fitness were determined by a continuous ease. An oralglucose-tolerance test (OGTT) was administered multistage exercise teston an electromagnetically braked cycle (see below) to ensure that all subjects were nondiabetic and had ergometer(Robert Bosch GmbH, Berlin, FRG). Before the test normal glucose tolerance according to the criteria of the Na- time was allotted for the subjects to become familiar with cytional Diabetes Data Group (17). Highly aerobicallytrained cling on an ergometer at a constant pedalling rate and to men were not accepted into the study to eliminate possible con- breathing through the apparatus used metabolic for measurefounding caused by differences between the two groups in level ments. The subjects began cycling at a rate of6O rpm with zero of cardiorespiratory fitness. All subjects were weight stable atexternal resistance(unloaded cycling). The work rate was inthe time of the study with no more than a 2-kg weight loss or creased in 30-W increments every 2 mm until volitional cxgain over the 6 mo before the study. The subjects consumed haustion was reached and the subject refused to continue dea weight-maintenance diet containing 250 g carbohydrate/d spite vocal encouragement or until he was unable to maintain several daysbefore and throughout the duration oftheir partic- the pedalling rate. Ventilatory measurements were made conipation in the study. Body weight was measured on every test tinuously by open-circuit respirometry with use of a Sensor-

sizes. To clarify

FFM

is the

difference

between

totalbody

weight

and

fat weight

Downloaded from www.ajcn.org by guest on June 28, 2011Methods

day to confirm weight maintenance. ers and were not taking any medications.
consent of all subjects was obtained

The men were nonsmokThe written informed
and the protocol
apwas

medics
Corporation,

Horizon

Metabolic
CA),

Measurement
which

Cart

(Sensormedics
volume

Anaheim,

includes

a turbine

transducer,

a Beckman

OM-l

1 polarographic

aanalyzer. breathing Densitometry used a Body fat content and FFM were determined by densitomebrated try. The subjects were tested in the morning after a 12-h fast. trogen, Body density was determined by hydrostatic weighing accord- 16% 02 ing to the method described by Akers and Buskirk (18)with theof 02
School

proved

by the Institutional

Review

Board

of the

Mount

Sinai andof Medicine.

Beckman LB-2 nondispersive The subjects breathed through a Hans-Rudolf nonrevalve (Hans Rudolph, Inc, Kansas City, MO) and mouthpiece and noseclips. The gas analyzers were calibefore and after each aerobic fitness with 100% nitest room air, and a gas mixture containing 4% CO2 and
.

oxygen analyzer, infrared carbon dioxide

For each
and CO2

measurement
(FF02 and...
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