Chamber for indirect calorimetry with improved transient response

被引:38
作者
Henning, B
Lofgren, R
Sjostrom, L
机构
[1] Clinical Metabolic Laboratory, Department of Medicine, Sahlgrenska Hospital
[2] Clinical Metabolic Laboratory, Department of Medicine, Sahlgrenska Hospital
[3] Chalmers University of Technology, Göteborg
关键词
carbon dioxide production; energy expenditure; fast-response calorimeter; indirect calorimetry; oxygen consumption;
D O I
10.1007/BF02520075
中图分类号
TP39 [计算机的应用];
学科分类号
081203 ; 0835 ;
摘要
A chamber for indirect calorimetry has been constructed that utilises previously published general equations for the calculation of respiration. Owing to the large size of the chamber, the changes in gas concentration caused by a subject are very small. Therefore, algorithms are developed for noise suppression and trend identification. Using the exact solution of the equations for steady state, each gas concentration is fitted by a least square method to two connected exponential segments, of variable length, for the preceding 30 min period. Independently of the location of the join between the two segments, the gas concentration and its time derivative are evaluated at - 15 min. This process is repeated, and its results are presented once every minute. As proven by gas injection tests, this procedure gives an instantaneous response to a single change in respiration, a correct averaging of repeated changes in respiration with periods of less than 15 min and noise suppression. It is concluded that this chamber is useful not only for traditional 24 h energy expenditure measurements, but also for experiments requiring rapid responses.
引用
收藏
页码:207 / 212
页数:6
相关论文
共 15 条
[1]  
ABRAMSON E., 1943, Acta Physiologica Scandinavica, V6, P1, DOI 10.1111/j.1748-1716.1943.tb02822.x
[2]   PREDICTION OF 24-H ENERGY-EXPENDITURE AND ITS COMPONENTS FROM PHYSICAL CHARACTERISTICS AND BODY-COMPOSITION IN NORMAL-WEIGHT HUMANS [J].
ASTRUP, A ;
THORBEK, G ;
LIND, J ;
ISAKSSON, B .
AMERICAN JOURNAL OF CLINICAL NUTRITION, 1990, 52 (05) :777-783
[3]   ANALYSIS OF GASEOUS EXCHANGE IN OPEN-CIRCUIT INDIRECT CALORIMETRY [J].
BROWN, D ;
COLE, TJ ;
DAUNCEY, MJ ;
MARRS, RW ;
MURGATROYD, PR .
MEDICAL & BIOLOGICAL ENGINEERING & COMPUTING, 1984, 22 (04) :333-338
[4]   A LOW-BUDGET AND EASY-TO-OPERATE ROOM RESPIROMETER FOR MEASURING DAILY ENERGY-EXPENDITURE IN MAN [J].
DULLOO, AG ;
ISMAIL, MN ;
RYALL, M ;
MELAS, G ;
GEISSLER, CA ;
MILLER, DS .
AMERICAN JOURNAL OF CLINICAL NUTRITION, 1988, 48 (06) :1367-1374
[5]   NUTRIENT BALANCE IN HUMANS - EFFECTS OF DIET COMPOSITION [J].
HILL, JO ;
PETERS, JC ;
REED, GW ;
SCHLUNDT, DG ;
SHARP, T ;
GREENE, HL .
AMERICAN JOURNAL OF CLINICAL NUTRITION, 1991, 54 (01) :10-17
[6]  
McLean J., 1987, Animal and Human Calorimetry
[7]  
MOON JK, 1995, J NUTR, V125, P220
[8]  
MURGATROYD PR, 1993, INT J OBESITY, V17, P549
[9]   INTRAINDIVIDUAL VARIABILITY AND MEASUREMENT NOISE IN ESTIMATES OF ENERGY-EXPENDITURE BY WHOLE-BODY INDIRECT CALORIMETRY [J].
MURGATROYD, PR ;
DAVIES, HL ;
PRENTICE, AM .
BRITISH JOURNAL OF NUTRITION, 1987, 58 (03) :347-356
[10]  
Pettenkofer M, 1862, ANN CHEM PHARM S2, V123, P1