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Arad AD, DiMenna FJ, Kittrell HD, Kissileff HR, Albu JB. Whole body lipid oxidation during exercise is impaired with poor insulin sensitivity but not with obesity per se. Am J Physiol Endocrinol Metab 2022; 323:E366-E377. [PMID: 35830686 DOI: 10.1152/ajpendo.00042.2022] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Equivocal findings regarding the influence of overweight/obesity on exercise lipid-oxidizing capacity (EX-LIPOX) might reflect inadequate control of 1) acute energy balance/macronutrient composition of diet; 2) intensity/duration of exercise; and/or 3) insulin sensitivity (IS) of participant. To assess independent/combined influences of IS and overweight/obesity with other factors controlled, we recruited sedentary adults with normal weight (NW; n = 15) or overweight/obesity (O; n = 15) subdivided into metabolically healthy (MH; n = 8) and unhealthy (MU; n = 7) groups (IS; MH > MU). Participants completed a 9-day, weight-stabilizing, controlled-feeding protocol comprising measurements of resting metabolism, body composition, oral glucose tolerance, and maximal exercise capacity. We measured EX-LIPOX during the initial 45 min of "steady state" during constant-work-rate cycling at 70% and 100% of participant gas-exchange threshold (GET). At 70%, average EX-LIPOX in absolute (0.11 ± 0.02 g·min-1) and relative (2.4 ± 0.3 mg·kgFFM-1·min-1) terms was lower for NW-MU than MH regardless of body composition (NW-MH, 0.19 ± 0.02 g·min-1/3.9 ± 0.3 mg·kgFFM-1·min-1; O-MH, 0.19 ± 0.02 g·min-1/3.7 ± 0.3 mg·kgFFM-1·min-1), whereas no difference was present for NW-MU and O-MU (0.15 ± 0.02 g·min-1/2.8 ± 0.3 mg·kgFFM-1·min-1). Multiple regression confirmed that with IS-controlled, overweight/obesity was not associated with decreased EX-LIPOX, whereas decreased EX-LIPOX was associated with decreased IS independent of overweight/obesity. Overweight/obesity also did not influence EX-LIPOX across MH groups or with cohort divided by body-composition classification alone (P > 0.05). Exercise lipid-oxidizing capacity is impaired with poor IS regardless of body composition, but not with overweight/obesity per se.NEW & NOTEWORTHY In this study, we have shown that the capacity to oxidize lipid during exercise is influenced by metabolic health of the exerciser regardless of body composition, but not by body composition per se. This observation refutes the belief that a reduced capacity to oxidize lipid is an obligatory characteristic of the overweight/obese condition while supporting the contention that exercise should be prescribed with specificity based on both absence/presence of overweight/obesity and compromise/lack thereof in metabolic health.
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Affiliation(s)
- Avigdor D Arad
- Division of Endocrinology, Diabetes and Bone, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York
- The Integrated Center for Preventive Medicine, Tel Aviv Medical Center, Tel Aviv, Israel
| | - Fred J DiMenna
- Division of Endocrinology, Diabetes and Bone, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Hannah D Kittrell
- The Charles Bronfman Institute for Personalized Medicine, Graduate School of Biomedical Sciences, Icahn School of Medicine at Mount Sinai, New York, New York
- The Mount Sinai Morningside Hospital, New York, New York
| | - Harry R Kissileff
- Division of Endocrinology, Diabetes and Bone, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York
- The Mount Sinai Morningside Hospital, New York, New York
| | - Jeanine B Albu
- Division of Endocrinology, Diabetes and Bone, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York
- The Mount Sinai Morningside Hospital, New York, New York
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Marcussen C, Gabel S, Meyer AK, Tauson AH. The oral 13C-bicarbonate technique for determination of energy expenditure in dogs: dietary and environmental factors affecting the respiratory quotient and 13C recovery factor. Arch Anim Nutr 2022; 75:489-509. [PMID: 35232290 DOI: 10.1080/1745039x.2021.2015986] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
The oral 13C-bicarbonate technique (o13CBT) can be used for short-term measurements of CO2 production (RCO2) and energy expenditure (EEx). The method relies on appropriate estimates for the respiratory quotient (RQ) and recovery factor (RF) of 13C. Four Retriever dogs were included in four experiments to validate the o13CBT against indirect calorimetry (IC), and determine RQ and RF; Expt. 1: feeding different protein:fat:carbohydrate ratios [in % of metabolisable energy]: 25:33:42 in a maintenance (Mnt.) diet; 38:26:36 in a high-protein high-fibre (HFibre) diet and 27:56:17 in a high-fat (HFat) diet, simultaneously with start of measurements (T0); Expt. 2: the Mnt. diet at T0 or 4 h postprandial (T4); Expt. 3: T4 at different ambient temperatures, 22°C and 15°C; Expt. 4: T4 after 1 h physical activity. The RCO2 and EEx were determined from the respiration chamber measurements made simultaneously with IC and the o13CBT (o13CBTonline), and in Expts. 1 and 2, also on two consecutive days using o13CBT with collection of breath into breath bags (o13CBTbreathbags). The RQ values obtained at T0 reflected dietary compositions, with the highest least square mean (LSM) of 0.954 for the Mnt. diet, 0.905 for the HFibre and 0.877 for the HFat diet (p < 0.05). An increased interval between meal and measurement period decreased RQ significantly (p < 0.05) in Expt. 2, LSM being 0.954 at T0 and 0.909 at T4. Ambient temperature (Expt. 3) and physical activity (Expt. 4) did not influence postprandial RQ. The RF values were not significantly affected by diet (Expt. 1). Measurements starting at T0 (Expt. 2) resulted in higher (p < 0.05) RF values than at T4 (LSM = 0.971 and 0.836, respectively). The ambient temperatures (Expt. 3) did not influence postprandial RF. However, when dogs were physically active prior to measurements (Expt. 4), RF values (LSM = 1.019) were higher (p < 0.05) than when resting only (LSM = 0.836). Calculations based on RQ and RF determined in each experiment resulted in RCO2 and EEx values which were not different regardless of method used, except for Expt. 1 where EEx-values [kJ · kg BW-0.75 · d-1] were higher (p < 0.05) when measured with o13CBTbreathbags (460) than by IC (421) and o13CBTonline (420). Provided accurate RQ and RF values, the o13CBTbreathbags can be used as an independent and minimally invasive research tool to determine EEx in dogs under carefully standardised conditions.
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Affiliation(s)
- Caroline Marcussen
- Department of Veterinary and Animal Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Frederiksberg, Denmark
| | - Stephanie Gabel
- Department of Veterinary and Animal Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Frederiksberg, Denmark
| | - Ann-Kristin Meyer
- Department of Veterinary and Animal Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Frederiksberg, Denmark
| | - Anne-Helene Tauson
- Department of Veterinary and Animal Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Frederiksberg, Denmark
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Proximate causes for diet-induced obesity in laboratory mice: a case study. Eur J Clin Nutr 2017; 71:306-317. [PMID: 28145422 DOI: 10.1038/ejcn.2016.243] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2016] [Accepted: 10/11/2016] [Indexed: 02/06/2023]
Abstract
BACKGROUND/OBJECTIVES Detailed protocols and recommendations for the assessment of energy balance have been provided to address the problems associated with different body mass and body composition as apparent for mouse models in obesity research. Here, we applied these guidelines to investigate energy balance in two inbred mouse strains with contrasting susceptibilities for diet-induced obesity (DIO). Mice of the AKR/J strain are highly susceptible, whereas the SWR/J mice are almost completely resistant. The proximate mechanisms responsible for this striking phenotypic difference are only partially understood. SUBJECTS/METHODS Body mass and body composition, metabolizable energy, energy expenditure (EE), body temperature and spontaneous physical activity behavior were first assessed in a cohort of male AKR/J (N=29) and SWR/J (N=30) mice fed on a low-fat control diet (CD) to identify metabolic adaptations determining resistance to DIO. Thereafter, the immediate metabolic responses to high-fat diet (HFD) feeding for 3 days were investigated. Groups of weight-matched AKR/J (N=8) and SWR/J (N=8) mice were selected from the initial cohort for this intervention. RESULTS Strain differences in body mass, fat mass and lean mass were adjusted by body mass as this was the only covariate significantly correlated with metabolizable energy and EE. On the CD, EE and fat oxidation was higher in SWR/J than in AKR/J mice, whereas no difference was found for metabolizable energy. In response to HFD feeding, both strains increased metabolizable energy intake, but also increased EE, body temperature, and fat oxidation. The catabolic adaptations to HFD feeding opposed the development of positive energy balance. Increased EE was not due to increased spontaneous physical activity. A significant strain difference was found when balancing metabolizable energy and daily energy expenditure (DEE). CONCLUSIONS The guidelines were applicable with some limitations related to the adjustment of differences in body composition. Metabolic phenotyping revealed that metabolizable energy, DEE and metabolic fuel selection all contribute to the development of DIO. Therefore, assessing both sides of the energy balance equation is essential to identify the proximate mechanisms.
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Dandapat A, Perrin BJ, Cabelka C, Razzoli M, Ervasti JM, Bartolomucci A, Lowe DA, Kyba M. High Frequency Hearing Loss and Hyperactivity in DUX4 Transgenic Mice. PLoS One 2016; 11:e0151467. [PMID: 26978271 PMCID: PMC4792399 DOI: 10.1371/journal.pone.0151467] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2015] [Accepted: 02/29/2016] [Indexed: 11/18/2022] Open
Abstract
Facioscapulohumeral muscular dystrophy (FSHD) is caused by mutations leading to ectopic expression of the transcription factor DUX4, and encompasses both muscle-related and non-muscle phenotypes. Mouse models bearing this gene represent valuable tools to investigate which pathologies are due to DUX4 expression, and how DUX4 leads to these pathologies. The iDUX4(2.7) mouse contains an X-linked doxycycline-inducible DUX4 gene that shows low level basal expression in the absence of doxycycline, leading to male lethality, generally in embryo, but always before 8 weeks of age. Here, we describe additional non-muscle phenotypes in this animal model. We find that iDUX4(2.7) female carriers are extremely hyperactive, spending large amounts of time ambulating and much less time resting. Rare 3-week old males, although hypophagic, runted and extremely fragile, are capable of high activity, but show periods of catatonic torpor in which animals appear dead and respiration is virtually absent. We also examine a non-muscle phenotype of interest to FSHD, high frequency hearing loss. We find that young iDUX4(2.7) females are significantly impaired in their ability to hear at frequencies above 8 kHz. These phenotypes make the iDUX4(2.7) mouse an attractive model in which to study non-muscle activities of DUX4.
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Affiliation(s)
- Abhijit Dandapat
- Lillehei Heart Institute and Department of Pediatrics, University of Minnesota, Minneapolis, 55455, United States of America
| | - Benjamin J. Perrin
- Department of Biochemistry, University of Minnesota, Minneapolis, 55455, United States of America
| | - Christine Cabelka
- Program in Physical Medicine and Rehabilitation, University of Minnesota, Minneapolis, 55455, United States of America
| | - Maria Razzoli
- Department of Integrative Biology and Physiology, University of Minnesota, Minneapolis, 55455, United States of America
| | - James M. Ervasti
- Department of Biochemistry, University of Minnesota, Minneapolis, 55455, United States of America
| | - Alessandro Bartolomucci
- Department of Integrative Biology and Physiology, University of Minnesota, Minneapolis, 55455, United States of America
| | - Dawn A. Lowe
- Program in Physical Medicine and Rehabilitation, University of Minnesota, Minneapolis, 55455, United States of America
| | - Michael Kyba
- Lillehei Heart Institute and Department of Pediatrics, University of Minnesota, Minneapolis, 55455, United States of America
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Støa EM, Nyhus LK, Børresen SC, Nygaard C, Hovet ÅM, Bratland-Sanda S, Helgerud J, Støren Ø. Day to day variability in fat oxidation and the effect after only 1 day of change in diet composition. Appl Physiol Nutr Metab 2015; 41:397-404. [PMID: 26960444 DOI: 10.1139/apnm-2015-0334] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Indirect calorimetry is a common and noninvasive method to estimate rate of fat oxidation (FatOx) during exercise, and test-retest reliability should be considered when interpreting results. Diet also has an impact on FatOx. The aim of the present study was to investigate day to day variations in FatOx during moderate exercise given the same diet and 2 different isoenergetic diets. Nine healthy, moderately-trained females participated in the study. They performed 1 maximal oxygen uptake test and 4 FatOx tests. Habitual diets were recorded and repeated to assess day to day variability in FatOx. FatOx was also measured after 1 day of fat-rich (26.8% carbohydrates (CHO), 23.2% protein, 47.1% fat) and 1 day of CHO-rich diet (62.6% CHO, 20.1% protein, 12.4% fat). The reliability test revealed no differences in FatOx, respiratory exchange ratio (RER), oxygen uptake, carbon dioxide production, heart rate, blood lactate concentration, or blood glucose between the 2 habitual diet days. FatOx decreased after the CHO-rich diet compared with the habitual day 2 (from 0.42 ± 0.15 to 0.29 ± 0.13 g·min(-1), p < 0.05). No difference was found in FatOx between fat-rich diet and the 2 habitual diet days. FatOx was 31% lower (from 0.42 ± 0.14 to 0.29 ± 0.13 g·min(-1), p < 0.01) after the CHO-rich diet compared with the fat-rich diet. Using RER data to measure FatOx is a reliable method as long as the diet is strictly controlled. However, even a 1-day change in macronutrient composition will likely affect the FatOx results.
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Affiliation(s)
- Eva Maria Støa
- a Department of Sport and Outdoor Life Studies, Telemark University College, Bø, Norway
| | - Lill-Katrin Nyhus
- a Department of Sport and Outdoor Life Studies, Telemark University College, Bø, Norway
| | | | - Caroline Nygaard
- a Department of Sport and Outdoor Life Studies, Telemark University College, Bø, Norway
| | - Åse Marie Hovet
- a Department of Sport and Outdoor Life Studies, Telemark University College, Bø, Norway
| | | | - Jan Helgerud
- a Department of Sport and Outdoor Life Studies, Telemark University College, Bø, Norway.,b Norwegian University of Science and Technology, Faculty of Medicine, Department of Circulation and Medical Imaging, Trondheim, Norway.,c Hokksund Medical Rehabilitation Center, Hokksund, Norway
| | - Øyvind Støren
- a Department of Sport and Outdoor Life Studies, Telemark University College, Bø, Norway
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Abstract
Sitting too much kills. Epidemiological, physiological and molecular data suggest that sedentary lifestyle can explain, in part, how modernity is associated with obesity, more than 30 chronic diseases and conditions and high healthcare costs. Excessive sitting--sitting disease--is not innate to the human condition. People were designed to be bipedal and, before the industrial revolution, people moved substantially more throughout the day than they do presently. It is encouraging that solutions exist to reverse sitting disease. Work environments, schools, communities and cities can be re-imagined and re-invented as walking spaces, and people thereby offered more active, happier, healthier and more productive lives.
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Affiliation(s)
- James A Levine
- Mayo Clinic, 13400 East Shea Blvd, Scottsdale, AZ, 85259, USA,
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Duncan MJ, Clarke ND. The Effect of Acute Rhodiola rosea Ingestion on Exercise Heart Rate, Substrate Utilisation, Mood State, and Perceptions of Exertion, Arousal, and Pleasure/Displeasure in Active Men. JOURNAL OF SPORTS MEDICINE (HINDAWI PUBLISHING CORPORATION) 2014; 2014:563043. [PMID: 26464892 PMCID: PMC4590898 DOI: 10.1155/2014/563043] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/24/2014] [Revised: 03/29/2014] [Accepted: 04/02/2014] [Indexed: 12/31/2022]
Abstract
The aim of this study was to examine the effect of acute Rhodiola rosea (R. rosea) ingestion on substrate utilisation, mood state, RPE, and exercise affect. Ten males (mean age ± S.D. = 26 ± 6 years) completed two 30-minute cycling trials at an intensity of 70% of [Formula: see text] following ingestion of either 3 mg·kg(-1) body mass of R. rosea or placebo using a double-blind, crossover design. During exercise, heart rate and RPE were recorded. Participants completed measures of mood state and exercise affect before and after exercise. Expired air samples were taken during exercise to determine substrate utilisation. Repeated measures analysis of variance indicated that RPE was significantly lower at 30 minutes into exercise versus placebo (P = 0.003). Perceptions of arousal (P = 0.05) and pleasure were significantly higher after exercise with R. rosea compared to placebo (P = 0.003). Mood state scores for vigor were also higher in R. rosea condition compared to placebo (P = 0.008). There were no significant differences in energy expenditure, carbohydrate, or fat oxidation between conditions (P > 0.05). Ingestion of R. rosea favourably influenced RPE and exercise affect without changes in energy expenditure or substrate utilization during 30-minute submaximal cycling performance.
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Affiliation(s)
- Michael J. Duncan
- Department of Biomolecular and Sports Sciences, Coventry University, Coventry CV1 5HB, UK
- Human Performance Laboratory, Department of Biomolecular and Sports Sciences, Coventry University, James Starley Building, Priory Street, Coventry CV 5HB, UK
| | - Neil D. Clarke
- Department of Biomolecular and Sports Sciences, Coventry University, Coventry CV1 5HB, UK
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Schadewaldt P, Nowotny B, Strassburger K, Kotzka J, Roden M. Indirect calorimetry in humans: a postcalorimetric evaluation procedure for correction of metabolic monitor variability. Am J Clin Nutr 2013; 97:763-73. [PMID: 23446893 DOI: 10.3945/ajcn.112.035014] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Indirect calorimetry (IC) with metabolic monitors is widely used for noninvasive assessment of energy expenditure and macronutrient oxidation in health and disease. OBJECTIVE To overcome deficiencies in validity and reliability of metabolic monitors, we established a procedure that allowed correction for monitor-specific deviations. DESIGN Randomized comparative IC (canopy mode) with the Deltatrac MBM-100 (Datex) and Vmax Encore 29n (SensorMedix) was performed in postabsorptive (overnight fast >8 h) healthy subjects (n = 40). In vitro validation was performed by simulation of oxygen consumption (VO2) and carbon dioxide output (VCO2) rates by using mass-flow regulators and pure gases. A simulation-based postcalorimetric calibration of cart readouts [individual calibration control evaluation (ICcE)] was established in adults (n = 24). RESULTS The comparison of carefully calibrated monitors showed marked differences in VCO2 and VO2 (P < 0.01) and derived metabolic variables [resting energy expenditure (REE), respiratory quotient (RQ), glucose/carbohydrate oxidation (Gox), and fat oxidation (Fox); P < 0.001]. Correlations appeared to be acceptable for breath gas rates and REE (R(2) ~ 0.9) but were unacceptable for RQ (R(2) = 0.3), Gox, and Fox (R(2) = 0.2). In vitro simulation experiments showed monitor-dependent interferences for VCO2 and VO2 as follows: 1) within series, nonlinear and variable deviations of monitor readouts at different exchange rates; 2) between series, differences and unsteady variability; and 3) differences in individual monitor characteristics (eg, rate dependence, stability, imprecision). The introduction of the postcalorimetric recalibration by ICcE resulted in an adjustment of gas exchange rates and the derived metabolic variables with reasonable correlations (R(2) > 0.9). CONCLUSIONS Differential, metabolic, monitor-specific deviations are the primary determinants for lack of accuracy, comparability, and transferability of results. This problem can be overcome by the present postcalorimetric ICcE procedure.
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Affiliation(s)
- Peter Schadewaldt
- Institutes of Clinical Biochemistry and Pathobiochemistry, German Diabetes Center, Düsseldorf, Düsseldorf, Germany.
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Kaiyala KJ, Ramsay DS. Direct animal calorimetry, the underused gold standard for quantifying the fire of life. Comp Biochem Physiol A Mol Integr Physiol 2011; 158:252-64. [PMID: 20427023 PMCID: PMC3920988 DOI: 10.1016/j.cbpa.2010.04.013] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2010] [Revised: 04/16/2010] [Accepted: 04/18/2010] [Indexed: 11/25/2022]
Abstract
Direct animal calorimetry, the gold standard method for quantifying animal heat production (HP), has been largely supplanted by respirometric indirect calorimetry owing to the relative ease and ready commercial availability of the latter technique. Direct calorimetry, however, can accurately quantify HP and thus metabolic rate (MR) in both metabolically normal and abnormal states, whereas respirometric indirect calorimetry relies on important assumptions that apparently have never been tested in animals with genetic or pharmacologically-induced alterations that dysregulate metabolic fuel partitioning and storage so as to promote obesity and/or diabetes. Contemporary obesity and diabetes research relies heavily on metabolically abnormal animals. Recent data implicating individual and group variation in the gut microbiome in obesity and diabetes raise important questions about transforming aerobic gas exchange into HP because 99% of gut bacteria are anaerobic and they outnumber eukaryotic cells in the body by ∼10-fold. Recent credible work in non-standard laboratory animals documents substantial errors in respirometry-based estimates of HP. Accordingly, it seems obvious that new research employing simultaneous direct and indirect calorimetry (total calorimetry) will be essential to validate respirometric MR phenotyping in existing and future pharmacological and genetic models of obesity and diabetes. We also detail the use of total calorimetry with simultaneous core temperature assessment as a model for studying homeostatic control in a variety of experimental situations, including acute and chronic drug administration. Finally, we offer some tips on performing direct calorimetry, both singly and in combination with indirect calorimetry and core temperature assessment.
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Affiliation(s)
- Karl J Kaiyala
- University of Washington, Department of Dental Public Health Sciences, School of Dentistry, Seattle, WA 98195-7475, USA.
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10
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German JP, Wisse BE, Thaler JP, Oh-I S, Sarruf DA, Ogimoto K, Kaiyala KJ, Fischer JD, Matsen ME, Taborsky GJ, Schwartz MW, Morton GJ. Leptin deficiency causes insulin resistance induced by uncontrolled diabetes. Diabetes 2010; 59:1626-34. [PMID: 20424233 PMCID: PMC2889761 DOI: 10.2337/db09-1918] [Citation(s) in RCA: 113] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
OBJECTIVE Depletion of body fat stores during uncontrolled, insulin-deficient diabetes (uDM) results in markedly reduced plasma leptin levels. This study investigated the role of leptin deficiency in the genesis of severe insulin resistance and related metabolic and neuroendocrine derangements induced by uDM. RESEARCH DESIGN AND METHODS Adult male Wistar rats remained nondiabetic or were injected with the beta-cell toxin, streptozotocin (STZ) to induce uDM and subsequently underwent subcutaneous implantation of an osmotic minipump containing either vehicle or leptin at a dose (150 microg/kg/day) designed to replace leptin at nondiabetic plasma levels. To control for leptin effects on food intake, another group of STZ-injected animals were pair fed to the intake of those receiving leptin. Food intake, body weight, and blood glucose levels were measured daily, with body composition and indirect calorimetry performed on day 11, and an insulin tolerance test to measure insulin sensitivity performed on day 16. Plasma hormone and substrate levels, hepatic gluconeogenic gene expression, and measures of tissue insulin signal transduction were also measured. RESULTS Physiologic leptin replacement prevented insulin resistance in uDM via a mechanism unrelated to changes in food intake or body weight. This effect was associated with reduced total body fat and hepatic triglyceride content, preservation of lean mass, and improved insulin signal transduction via the insulin receptor substrate-phosphatidylinositol-3-hydroxy kinase pathway in the liver, but not in skeletal muscle or adipose tissue. Although physiologic leptin replacement lowered blood glucose levels only slightly, it fully normalized elevated plasma glucagon and corticosterone levels and reversed the increased hepatic expression of gluconeogenic enzymes characteristic of rats with uDM. CONCLUSIONS We conclude that leptin deficiency plays a key role in the pathogenesis of severe insulin resistance and related endocrine disorders in uDM. Treatment of diabetes in humans may benefit from correction of leptin deficiency as well as insulin deficiency.
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Affiliation(s)
- Jonathan P. German
- Diabetes and Obesity Center of Excellence, Department of Medicine, University of Washington, Seattle, Washington
| | - Brent E. Wisse
- Diabetes and Obesity Center of Excellence, Department of Medicine, University of Washington, Seattle, Washington
| | - Joshua P. Thaler
- Diabetes and Obesity Center of Excellence, Department of Medicine, University of Washington, Seattle, Washington
| | - Shinsuke Oh-I
- Diabetes and Obesity Center of Excellence, Department of Medicine, University of Washington, Seattle, Washington
| | - David A. Sarruf
- Diabetes and Obesity Center of Excellence, Department of Medicine, University of Washington, Seattle, Washington
| | - Kayoko Ogimoto
- Diabetes and Obesity Center of Excellence, Department of Medicine, University of Washington, Seattle, Washington
| | - Karl J. Kaiyala
- Department of Dental Public Health Sciences, School of Dentistry, University of Washington, Seattle, Washington
| | - Jonathan D. Fischer
- Diabetes and Obesity Center of Excellence, Department of Medicine, University of Washington, Seattle, Washington
| | - Miles E. Matsen
- Diabetes and Obesity Center of Excellence, Department of Medicine, University of Washington, Seattle, Washington
| | - Gerald J. Taborsky
- VA Puget Sound Health Care System, Department of Veterans Affairs Medical Center, Seattle, Washington
| | - Michael W. Schwartz
- Diabetes and Obesity Center of Excellence, Department of Medicine, University of Washington, Seattle, Washington
| | - Gregory J. Morton
- Diabetes and Obesity Center of Excellence, Department of Medicine, University of Washington, Seattle, Washington
- Corresponding author: Gregory J. Morton,
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Jordan PN, Hall KD. Dynamic coordination of macronutrient balance during infant growth: insights from a mathematical model. Am J Clin Nutr 2008; 87:692-703. [PMID: 18326609 PMCID: PMC2562789 DOI: 10.1093/ajcn/87.3.692] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Complex dynamic changes in body composition, dietary intake, energy expenditure, and macronutrient oxidation occur during infant growth. Although previous investigators have focused on energy requirements for normal growth, little is known about the dynamic coordination of macronutrient balance. OBJECTIVE Our objective was to develop a mathematical model of the dynamic relations between diet, macronutrient oxidation, and energy expenditure during normal infant growth. DESIGN We developed a mathematical model that integrates longitudinal data on changes of body composition and carbon dioxide production determined with the doubly labeled water method to calculate both energy intake requirements and macronutrient oxidation rates during normal infant growth. RESULTS The calculated fat oxidation rate was initially <20 kcal x kg(-1) x d(-1), despite the consumption of >60 kcal x kg(-1) x d(-1) of dietary fat. This discrepancy was maintained until approximately 6 mo, after which fat intake was only slightly greater than fat oxidation. Nonfat oxidation closely followed nonfat dietary intake for the duration of the period studied. Model calculations of the energy intake requirements for normal growth were slightly lower than previous estimates. The calculations were robust to variations of body weight, body composition, and diet composition input data, but depended sensitively on variations of carbon dioxide production data. CONCLUSIONS Our model presents a dynamic picture of how macronutrient oxidation adapts in concert with dietary changes and energy expenditure to give rise to normal tissue deposition. The model integrates a variety of data in a self-consistent way, simulating the complex metabolic adaptations occurring during normal growth while extracting important physiologic information from the data that would otherwise be unavailable.
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Affiliation(s)
- Peter N Jordan
- Laboratory of Biological Modeling, National Institute of Diabetes, Digestive, and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892-5621, USA
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12
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Abstract
Today, there are still uncertainties about the role of exogenous fat on body fat regulation. Early models of energy utilization (for example, Kleiber's, early 20th century) failed to take into account the nature of substrate oxidized in the control of food intake, whereas more recent models (e.g., Flatt's model, end of 20th century) did. Excess body fat storage is ultimately a problem of chronic positive energy balance mediated by a poor control of energy intake or/and a blunted total energy expenditure. Excess fat storage can stem from exogenous fat and to a more limited extent by nonfat substrates precursors transformed into body fat, mostly from carbohydrates, a process known as de novo lipogenesis. When considered over periods of weeks, months or years, total fat balance is closely related to energy balance. Over periods of days, the net change in fat balance is quantitatively limited as compared to the size of endogenous fat storage. The issues discussed in this article primarily include the stimulation of de novo lipogenesis after acute or prolonged CHO overfeeding and whether de novo lipogenesis is a risk factor for obesity development.
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Affiliation(s)
- Yves Schutz
- Department of Physiology, Faculty of Biology and Medicine, University of Lausanne, Rue du Bugnon 7, CH-1005 Lausanne, Switzerland.
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Chwalibog A, Tauson AH, Thorbek G. Energy metabolism and substrate oxidation in pigs during feeding, starvation and re-feeding. J Anim Physiol Anim Nutr (Berl) 2004; 88:101-12. [PMID: 15059233 DOI: 10.1111/j.1439-0396.2003.00465.x] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Energy metabolism and substrate oxidation was measured in 12 growing pigs by means of indirect calorimetry and nutrient balances. The measurements were carried out during 5 days of feeding followed by 4 days of starvation and 5 days of re-feeding. During the feeding period, dietary carbohydrates were the main energy source, sufficient to cover energy requirements without oxidation of fat. Starvation reduced the total heat production and affected the oxidation pattern by reducing protein oxidation and shifting from carbohydrate to fat oxidation. On the second day of starvation, the main energy source was body fat and there was no oxidation of carbohydrate. On the second day of re-feeding, the heat production reached the same level as during the feeding period. Also, during the second day of re-feeding, the pattern of nutrient oxidation was similar to the feeding period with oxidation of carbohydrate providing 90% and oxidation of protein providing 10% of the total heat production. There was no fat oxidation. The results demonstrated that the growing pigs were able to re-establish oxidative patterns already 2 days after re-alimentation.
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Affiliation(s)
- A Chwalibog
- Department of Animal Science and Animal Health, The Royal Veterinary and Agricultural University, Frederiksberg C, Denmark.
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Tauson AH, Chwalibog A, Ahlstrøm Ø. Substrate oxidation in male blue foxes (Alopex lagopus) during feeding, fasting and realimentation. J Nutr 2002; 132:1793S-5S. [PMID: 12042531 DOI: 10.1093/jn/132.6.1793s] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Anne-Helene Tauson
- Department of Animal Science and Animal Health, The Royal Veterinary and Agricultural University, Frederiksberg, Denmark.
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Tauson AH, Fink R, Chwalibog A. Can gas exchange measurements be used for calculation of nutrient oxidation in mink (Mustela vison) exposed to short-term changes in energy supply? ZEITSCHRIFT FUR ERNAHRUNGSWISSENSCHAFT 1997; 36:317-20. [PMID: 9467225 DOI: 10.1007/bf01617807] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Nutrient oxidation was calculated from gas exchange measurements for 6 control and 12 flush fed female mink, measured in six consecutive, one week periods. The energy supply to controls and flushed animals in periods 1 and 6 was ca 850 kJ ME/day, and during restriction and flush feeding, it was ca 450 kg ME/day and ca 1300 kJ ME/day, respectively. Over the total experimental period the energy intake was similar in both groups, but it differed significantly between periods in the flushed group. Protein, fat, and carbohydrate oxidation averaged 39, 38, and 21%, of the total heat production (HP), respectively in the control group. During restriction, protein oxidation was ca 35% of HP in flushed animals, then increasing to 55% of HP during the first period of refeeding. High values for fat oxidation were recorded during restriction because of fat mobilization and values were low when feed supply was ample. It was concluded that the calculation method was a good indicative method, but some short-comings were discussed.
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Affiliation(s)
- A H Tauson
- Department of Animal Science and Animal Health, Royal Veterinary and Agricultural University, Frederiksberg, Copenhagen, Denmark
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