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Indirect calorimetry

Jacob S Ballon, Utpal B Pajvani, Laurel Es Mayer, Zachary Freyberg, Robin Freyberg, Ignacio Contreras, Michael Rosenbaum, Rudolph L Leibel, Jeffrey A Lieberman
Second generation antipsychotics are prescribed for an increasing number of psychiatric conditions, despite variable associations with weight gain, dyslipidemia, and impaired glucose tolerance. The mechanism(s) of the apparent causal relationships between these medications and metabolic effects have been inadequately defined and are potentially confounded by genetic risk of mental illness, attendant lifestyle, and concomitant medications. Therefore, we conducted a study in which 24 healthy volunteers were randomized to olanzapine (highly weight-gain liability), iloperidone (less weight-gain liability), or placebo treatment for 28 days under double-blind conditions...
February 1, 2018: Journal of Psychopharmacology
Taku Oshima, Marco Ragusa, Séverine Graf, Yves Marc Dupertuis, Claudia-Paula Heidegger, Claude Pichard
INTRODUCTION: The international ICALIC initiative aims at developing a new indirect calorimeter according to the needs of the clinicians and researchers in the field of clinical nutrition and metabolism. The project initially focuses on validating the calorimeter for use in mechanically ventilated acutely ill adult patient. However, standard methods to validate the accuracy of calorimeters have not yet been established. This paper describes the procedures for the in-vitro tests to validate the accuracy of the new indirect calorimeter, and defines the ranges for the parameters to be evaluated in each test to optimize the validation for clinical and research calorimetry measurements...
December 2017: Clinical Nutrition ESPEN
Aya Itoi, Yosuke Yamada, Keiichi Yokoyama, Tetsuji Adachi, Misaka Kimura
BACKGROUND & AIMS: Accurate estimation of energy expenditure in older people is important for nutritional support. The current literature contains controversial or inconsistent data regarding the resting metabolic rate (RMR, or basal metabolic rate) in older adults, including the relationship between the RMR and ethnicity. Little information about the RMR in healthy Asian older adults is available. This study was performed to examine the RMR in healthy Japanese older adults and compare it with previously established 16 equations...
December 2017: Clinical Nutrition ESPEN
Therese Fostervold Mathisen, Kethe Marie Engen, Jorunn Sundgot-Borgen, Trine Stensrud
BACKGROUND AND AIMS: To enable clinicians to identify the clinical picture and treatment progress and to adjust eating plans according to personal energy needs, it is important to know the patient's correct resting metabolic rate (RMR). Indirect calorimetry (IC) is the preferred method for assessment of RMR, but long duration of measurement increases the load on the patients, and reduces the effectiveness in clinical and scientific settings. Further; not all patients reach a valid RMR according to the suggested best practice protocol, with 5 min of steady state (SS) where respiratory gas volume exchange varies less than 10%...
December 2017: Clinical Nutrition ESPEN
Lars C Gormsen, Esben Søndergaard, Nana L Christensen, Steen Jakobsen, Erik H T Nielsen, Ole L Munk, Lars P Tolbod, Niels Jessen, Søren Nielsen
AIMS: Metformin is due to its well-documented glucose lowering effect the most commonly used drug in patients with T2D. However, metformin have also in pre-clinical studies been shown to improve lipid metabolism, possibly through modulation of intrahepatic partitioning of fatty acids towards oxidation and away from reesterification and resecretion as triglycerides. MATERIALS AND METHODS: To explore whether these pre-clinical findings can be translated to a human setting, we performed a 3-month randomized, placebo controlled, parallel-group clinical trial in patients with T2D (24 patients) and healthy controls (12 subjects)...
February 6, 2018: Diabetes, Obesity & Metabolism
Georgios K Dimitriadis, Harpal S Randeva, Saboor Aftab, Asad Ali, John G Hattersley, Sarojini Pandey, Dimitris K Grammatopoulos, Georgios Valsamakis, Georgios Mastorakos, T Hugh Jones, Thomas M Barber
AIM: To explore the metabolic phenotype of obesity-related secondary hypogonadism (SH) in men pre-replacement and post-replacement therapy with long-acting intramuscular (IM) testosterone undecanoate (TU). METHODS: A prospective observational pilot study on metabolic effects of TU IM in male obesity-related SH (hypogonadal [HG] group, n = 13), including baseline comparisons with controls (eugonadal [EG] group, n = 15). Half the subjects (n = 7 in each group) had type 2 diabetes mellitus (T2D)...
February 2, 2018: Endocrine
John Ashley, Youngdeok Kim, Joaquin U Gonzales
Supplementation with L-citrulline (Cit) has been shown to improve muscle oxygenation and oxygen uptake (VO2) kinetics during moderate-to-high intensity cycling in young men. The aim of this study was to test the hypothesis whether Cit would improve VO2 kinetics during walking in older and young adults. In a randomized, double-blind study, 26 (15 women, 11 men) adults between the ages of 20-35y (n = 15) and 64-86y (n = 11) completed 7 day periods of taking placebo and L-citrulline (6 g/day) in a crossover manner...
February 2, 2018: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
Karen Ringwald-Smith, Ashley Hobar, Casey Flowers, Katie Badgett, Ruth Williams-Hooker, Robin R Roach, April Sykes, Zhaohua Lu, Paul Mackert, Belinda N Mandrell
BACKGROUND: Evaluation of energy requirements is an important part of the nutrition assessment of pediatric oncology patients. Adequate provision of energy in this population is of extreme importance because of the prevalence of malnutrition and its effect on growth, development, quality of life, morbidity, and mortality. Numerous methods are used in clinical practice for estimating the resting energy expenditures (REE), specifically indirect calorimetry and predictive equations. A relatively new instrument used to assess REE is the hand-held indirect calorimeter...
February 2, 2018: Nutrition in Clinical Practice
Maria I Maraki, Demosthenes B Panagiotakos, Lisa T Jansen, Costas Anastasiou, Anastasios Papalazarou, Mary Yannakoulia, Labros S Sidossis, Stavros A Kavouras
AIM: To examine the validity of published resting energy expenditure (REE) equations in Greek adults, and if indicated, develop new cohort-specific predictive REE equations. METHODS: Indirect calorimetry and anthropometric data were obtained from 226 adult volunteers of diverse age groups and body mass index ranges (18-60 years, 16.6-67.7 kg·m-2). Measured REE was compared to preexisting prediction equations via correlation, regression, and Bland-Altman analysis...
January 30, 2018: Annals of Nutrition & Metabolism
Asumi Yoshida, Kazuko Ishikawa-Takata, Shigeho Tanaka, Naoto Suzuki, Satoshi Nakae, Hiroko Murata, Motoko Taguchi, Mitsuru Higuchi
Herein, we attempted to prove the validity of a new approach to assessing total energy expenditure (TEE) that combines activity recording and accelerometry in athletes. Eight female endurance runners participated in this study. We measured TEE over 8 days in the regular training season by using the doubly labeled water (DLW) method. In the combined method, an activity record of the rating of perceived exertion (RPE) was used to estimate energy expenditure (EE) during the training period, while a tri-axial accelerometer was used to evaluate EE during the non-training time over the TEE measurement period using the DLW method...
January 30, 2018: Journal of Strength and Conditioning Research
Chiara Milanese, Valentina Cavedon, Marco Sandri, Enrico Tam, Francesco Piscitelli, Federico Boschi, Carlo Zancanaro
The ability of whole body vibration (WBV) to increase energy expenditure (EE) has been investigated to some extent in the past using short-term single exercises or sets of single exercises. However, the current practice in WBV training for fitness is based on the execution of multiple exercises during a WBV training session for a period of at least 20 min; nevertheless, very limited and inconsistent data are available on EE during long term WBV training session. This crossover study was designed to demonstrate, in an adequately powered sample of participants, the ability of WBV to increase the metabolic cost of exercise vs...
2018: PloS One
Natália da Silva Lima, Lucimara Teixeira, Alessandra Gambero, Marcelo Lima Ribeiro
The aim of this study was to evaluate the effects of guarana on mitochondrial biogenesis in a high-fat diet (HFD)-fed mice. C57BL6J mice were divided in two groups: high-fat diet HFD and high-fat diet + guarana (HFD-GUA). Both groups received HFD and water ad libitum and the HFD-GUA group also received a daily gavage of guarana (1 g/kg weight). Body weight and food intake was measured weekly. Glycemic, triglyceride, and cholesterol levels were determined. VO₂ and energy expenditure (EE) were determined by indirect calorimetry...
January 31, 2018: Nutrients
Nader Lessan, Ilham Saadane, Budour Alkaf, Catherine Hambly, Adam J Buckley, Nick Finer, John R Speakman, Maha T Barakat
Background: Fasting during the month of Ramadan entails abstinence from eating and drinking between dawn and sunset and a major shift in meal times and patterns with associated changes in several hormones and circadian rhythms; whether there are accompanying changes in energy metabolism is unclear. Objective: We have investigated the impact of Ramadan fasting on resting metabolic rate (RMR), activity, and total energy expenditure (TEE). Design: Healthy nonobese volunteers (n = 29; 16 women) fasting during Ramadan were recruited...
January 1, 2018: American Journal of Clinical Nutrition
Corey A Rynders, Stacy L Schmidt, Audrey Bergouignan, Tracy J Horton, Daniel H Bessesen
Hypogonadism in males is associated with increased body fat and altered postprandial metabolism, but mechanisms remain poorly understood. Using a cross-over study design, we investigated the effects of short-term sex hormone suppression with or without testosterone add-back on postprandial metabolism and the fate of dietary fat. Eleven healthy males (age: 29 ± 4.5 year; BMI: 26.3 ± 2.1 kg/m2 ) completed two 7-day study phases during which hormone levels were altered pharmacologically to produce a low sex hormone condition (gonadotropin releasing hormone antagonist, aromatase inhibitor, and placebo gel) or a testosterone add-back condition (testosterone gel)...
January 2018: Physiological Reports
Chenlu He, Gregory S Custer, Jingheng Wang, Silvina Matysiak, Dorothy Beckett
Small molecules regulate transcription in both eukaryotes and prokaryotes by either enhancing or decreasing assembly of transcription regulatory complexes. For allosteric transcription repressors superrepressor mutants can exhibit increased sensitivity to small molecule corepressors. However, since many transcription regulatory complexes assemble in multiple steps, the superrepressor phenotype can reflect changes in any or all of the individual assembly steps. E. coli biotin operon repression complex assembly, which responds to input biotin concentration, occurs via three coupled equilibria including corepressor binding, holorepressor dimerization and dimer binding to DNA...
January 22, 2018: Biochemistry
Laura E Rupprecht, Alison D Kreisler, Samantha R Spierling, Giordano de Guglielmo, Marsida Kallupi, Olivier George, Eric C Donny, Eric P Zorrilla, Alan F Sved
RATIONALE: The ability of nicotine to suppress body weight is cited as a factor impacting smoking initiation and the failure to quit. Self-administered nicotine in male rats suppresses weight independent of food intake, suggesting that nicotine increases energy expenditure. OBJECTIVE: The current experiment evaluated the impact of self-administered nicotine on metabolism in rats using indirect calorimetry and body composition analysis. METHODS: Adult male rats with ad libitum access to powdered standard rodent chow self-administered intravenous infusions of nicotine (60 μg/kg/infusion or saline control) in daily 1-h sessions in the last hour of the light cycle...
January 21, 2018: Psychopharmacology
Deborah R Smith, R F G J King, L C Duckworth, L Sutton, T Preston, J P O'Hara, B Jones
Criterion data for total energy expenditure (TEE) in elite rugby are lacking, which prediction equations may not reflect accurately. This study quantified TEE of 27 elite male rugby league (RL) and rugby union (RU) players (U16, U20, U24 age groups) during a 14-day in-season period using doubly labelled water (DLW). Measured TEE was also compared to estimated, using prediction equations. Resting metabolic rate (RMR) was measured using indirect calorimetry, and physical activity level (PAL) estimated (TEE:RMR)...
January 20, 2018: European Journal of Applied Physiology
Elisabeth De Waele, Patrick M Honoré, Manu L N G Malbrain
PURPOSE OF REVIEW: To review the recent findings on metabolic monitoring and possible beneficial effects of an adequate nutrition therapy, based on indirect calorimetry as the golden standard to predict energy expenditure. RECENT FINDINGS: in the last decades, major steps are taken in the field of metabolism and nutrition, evolving from nutrition as a baseline support to a therapeutic intervention. The aspect of energy expenditure is of cardinal importance, and technical possibilities have impressively improved: from the first 'calorimetre' in 1789 to the new generation, clinical applicable indirect calorimeters and the high accuracy and easy use model reaching high technology readiness level [Oshima et al...
March 2018: Current Opinion in Clinical Nutrition and Metabolic Care
Pi-Hui Hsu, Chao-Hsien Lee, Li-Kuo Kuo, Yu-Chung Kung, Wei-Ji Chen, Min-Su Tzeng
BACKGROUND: Due to studies on calorie requirement in mechanically ventilated critically ill elderly patients are few, and indirect calorimetry (IC) is not available in every intensive care unit (ICU). The aim of this study was to compare IC and Harris-Benedict (HB) predictive equation in different BMI groups. METHODS: A total of 177 mechanically ventilated critically ill elderly patients (≧65 years old) underwent IC for measured resting energy expenditure (MREE)...
January 11, 2018: Journal of the Formosan Medical Association, Taiwan Yi Zhi
Nicholas M Beltz, Fabiano Amorim, Ann L Gibson, Jeffrey M Janot, Len Kravitz, Christine M Mermier, Nathan Cole, Terence A Moriarty, Tony P Nunez, Sam Trigg, Lance Dalleck
PURPOSE: Recent examinations have shown lower maximal oxygen uptake (VO2max) during traditional ramp (RAMP) compared to self-paced (SPV) graded exercise testing (GXT) attributed to differences in cardiac ouput. The current study examined the differences in hemodyamic and metabolic responses between RAMP and SPV during treadmill exercise. METHODS: Sixteen recreationally trained men (23.7±3.0 yrs) completed two separate treadmill GXT protocols. SPV consisted of five 2-min stages (10 min total) of increasing speed clamped by the Borg RPE6-20 scale...
January 15, 2018: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
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