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Indirect calorimetry

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https://www.readbyqxmd.com/read/28324055/substrate-metabolism-and-insulin-sensitivity-during-fasting-in-obese-human-subjects-impact-of-gh-blockade
#1
Morten Høgild Pedersen, Mads Vandsted Svart, Janne Lebeck, Martin Bidlingmaier, Hans Stødkilde-Jørgensen, Steen Bønløkke Pedersen, Niels Møller, Niels Jessen, Jens O L Jørgensen
Context: Insulin resistance and metabolic inflexibility are features of obesity and are amplified by fasting. GH secretion increases during fasting and GH causes insulin resistance. Objective: To study the metabolic effects of GH blockade during fasting in obese subjects. Subjects and Methods: Nine obese males were studied thrice in a randomized design: 1) After an overnight fast (Control), 2) After 72 h fasting (Fasting) and 3) After 72 h fasting with GH blockade (pegvisomant) (Fasting + GHA)...
January 18, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28323025/ability-to-predict-resting-energy-expenditure-with-six-equations-compared-to-indirect-calorimetry-in-octogenarian-men
#2
Mikael Karlsson, Erika Olsson, Wulf Becker, Brita Karlström, Tommy Cederholm, Per Sjögren
The accuracy of predictive equations for calculating resting energy expenditure (REE) in elderly people has been questioned. Aging is associated with progressive declines in REE, which partly is explained by loss of fat free mass (FFM). Against this background we aimed to identify the most accurate predictive equation for REE in octogenarian men, taking body composition into account and using indirect calorimetry as reference value. REE was measured in 22 men (mean age 82.6±0.3years) and compared with six predictive equations: two based on FFM and four based on body weight, height and/or age...
March 16, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28322128/reduction-in-hydroxyhydroquinone-from-coffee-increases-postprandial-fat-utilization-in-healthy-humans-a-randomized-double-blind-cross-over-trial
#3
Satoko Soga, Noriyasu Ota, Akira Shimotoyodome
The present study aimed to clarify the effect of reduction in hydroxyhydroquinone (HHQ) from roasted coffee on energy utilization in humans. Indirect calorimetry showed that one-week ingestion of HHQ-reduced coffee led to significantly higher postprandial fat utilization than that of HHQ-containing coffee. This finding indicates that reduction in HHQ from coffee increases postprandial fat utilization.
March 21, 2017: Bioscience, Biotechnology, and Biochemistry
https://www.readbyqxmd.com/read/28319140/role-of-muscle-il-6-in-gender-specific-metabolism-in-mice
#4
Amalia Molinero, Antonio Fernandez-Perez, Aina Mogas, Mercedes Giralt, Gemma Comes, Olaya Fernandez-Gayol, Mario Vallejo, Juan Hidalgo
The aim of the present work was to further explore the physiological roles of muscle-derived IL-6. Adult-floxed and conditional skeletal muscle IL-6 knock out male and female mice were used to study energy expenditure (indirect calorimetry at rest and during treadmill exercise, and body temperature cycle during the light phase) and energy intake (response to fast/refeeding). We also evaluated the responses to leptin and the activity of the insulin signalling pathway in skeletal muscle and liver by phosphorylation of Akt at Ser 473...
2017: PloS One
https://www.readbyqxmd.com/read/28296943/new-approaches-to-determine-fatigue-in-elite-athletes-during-intensified-training-resting-metabolic-rate-and-pacing-profile
#5
Amy L Woods, Laura A Garvican-Lewis, Bronwen Lundy, Anthony J Rice, Kevin G Thompson
BACKGROUND: Elite rowers complete a high volume of training across a number of modalities to prepare for competition, including periods of intensified load, which may lead to fatigue and short-term performance decrements. As yet, the influence of substantial fatigue on resting metabolic rate (RMR) and exercise regulation (pacing), and their subsequent utility as monitoring parameters, has not been explicitly investigated in elite endurance athletes. METHOD: Ten National-level rowers completed a four-week period of intensified training...
2017: PloS One
https://www.readbyqxmd.com/read/28286784/the-influence-of-metabolic-imbalances-and-oxidative-stress-on-the-outcome-of-critically-ill-polytrauma-patients-a-review
#6
REVIEW
Alexandru Florin Rogobete, Dorel Sandesc, Marius Papurica, Emil Robert Stoicescu, Sonia Elena Popovici, Lavinia Melania Bratu, Corina Vernic, Adriana Mariana Sas, Adrian Tudor Stan, Ovidiu Horea Bedreag
The critically ill polytrauma patient presents with a series of associated pathophysiologies secondary to the traumatic injuries. The most important include systemic inflammatory response syndrome (SIRS), sepsis, oxidative stress (OS), metabolic disorders, and finally multiple organ dysfunction syndrome (MODS) and death. The poor outcome of these patients is related to the association of the aforementioned pathologies. The nutrition of the critically ill polytrauma patient is a distinct challenge because of the rapid changes in terms of energetic needs associated with hypermetabolism, sepsis, SIRS, and OS...
2017: Burns and trauma
https://www.readbyqxmd.com/read/28285643/energy-metabolism-differs-between-sleep-stages-and-begins-to-increase-prior-to-awakening
#7
Momoko Kayaba, Insung Park, Kaito Iwayama, Yumi Seya, Hitomi Ogata, Katsuhiko Yajima, Makoto Satoh, Kumpei Tokuyama
PURPOSE: Human sleep is generally consolidated into a single prolonged period, and its metabolic consequence is to impose an extended period of fasting. Changes in sleep stage and homeostatic sleep drive following sleep onset may affect sleeping metabolic rate through cross talk between the mechanisms controlling energy metabolism and sleep. The purpose of this study was to isolate the effects of sleep stage and time after sleep onset on sleeping metabolic rate. METHODS: The sleeping metabolic rate of 29 healthy adults was measured using whole room indirect calorimetry, during which polysomnographic recording of sleep was performed...
April 2017: Metabolism: Clinical and Experimental
https://www.readbyqxmd.com/read/28282751/a-single-bout-of-high-intensity-interval-exercise-and-work-matched-moderate-intensity-exercise-has-minimal-effect-on-glucose-tolerance-and-insulin-sensitivity-in-7-to-10-year-old-boys
#8
Emma J Cockcroft, Craig A Williams, Sarah R Jackman, Shikhar Bassi, Neil Armstrong, Alan R Barker
The purpose of this study was to assess the acute effect of high-intensity interval exercise (HIIE) and moderate-intensity exercise (MIE) on glucose tolerance, insulin sensitivity and fat oxidation in young boys. Eleven boys (8.8 ± 0.8 y) completed three conditions: 1) HIIE; 2) work-matched MIE; and 3) rest (CON) followed by an oral glucose tolerance test (OGTT) to determine glucose tolerance and insulin sensitivity (Cederholm index). Fat oxidation was measured following the OGTT using indirect calorimetry...
February 13, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28282744/wrist-based-cut-points-for-moderate-and-vigorous-intensity-physical-activity-for-the-actical-accelerometer-in-adults
#9
Keith M Diaz, David J Krupka, Melinda J Chang, Ian M Kronish, Natalie Moise, Jeff Goldsmith, Joseph E Schwartz
Wrist-based accelerometers are increasingly used to assess physical activity (PA) in population-based studies; however, cut-points to translate wrist-based accelerometer counts into PA intensity categories are still needed. The purpose of this study was to determine wrist-based cut-points for moderate- and vigorous-intensity ambulatory PA in adults for the Actical accelerometer. Healthy adults (n = 24) completed a four-phase treadmill exercise protocol (1.9, 3.0, 4.0 and 5.2 mph) while wearing an Actical accelerometer on their wrist...
February 23, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28278503/doubly-labeled-water-method-and-accelerometer-for-the-measurement-of-energy-expenditure-in-human-immunodeficiency-virus-infected-patients
#10
Mariana P Guimarães, Eduardo Ferriolli, Karina Pfrimer, Anderson M Navarro
BACKGROUND: Several studies have reported increased resting energy expenditure (REE) in human immunodeficiency virus (HIV)-infected patients with HIV-associated lipodystrophy syndrome (HALS). However, limited data exist on the total energy expenditure (TEE). This study was aimed at evaluating the REE and TEE of HIV-infected patients with and without HALS by using the doubly labeled water (DLW) technique and the activity monitor based on accelerometry system (AM), and comparing the results obtained using both methods...
March 10, 2017: Annals of Nutrition & Metabolism
https://www.readbyqxmd.com/read/28271035/attenuated-secretion-of-glucose-dependent-insulinotropic-polypeptide-gip-does-not-alleviate-hyperphagic-obesity-and-insulin-resistance-in-ob-ob-mice
#11
Satoko Shimazu-Kuwahara, Norio Harada, Shunsuke Yamane, Erina Joo, Akiko Sankoda, Timothy J Kieffer, Nobuya Inagaki
OBJECTIVE: Glucose-dependent insulinotropic polypeptide (GIP) is released during meals and promotes nutrient uptake and storage. GIP receptor knockout mice are protected from diet induced weight gain and thus GIP antagonists have been proposed as a treatment for obesity. In this study, we assessed the role of GIP in hyperphagia induced obesity and metabolic abnormalities in leptin deficient (Lep(ob/ob)) mice. METHODS: We crossbred GIP-GFP knock-in homozygous mice (GIP(gfp/gfp)) that have complete GIP knockout, and mice heterozygous for the ob mutation (Lep(ob/+)) mice to generate Lep(ob/+)/GIP(+/+), Lep(ob/ob)/GIP(+/+), and Lep(ob/ob)/GIP(gfp/gfp) mice...
March 2017: Molecular Metabolism
https://www.readbyqxmd.com/read/28260201/standing-economy-does-the-heterogeneity-in-the-energy-cost-of-posture-maintenance-reside-in-differential-patterns-of-spontaneous-weight-shifting
#12
Jennifer L Miles-Chan, Elie-Jacques Fares, Redina Berkachy, Philippe Jacquet, Laurie Isacco, Yves Schutz, Jean-Pierre Montani, Abdul G Dulloo
PURPOSE: Due to sedentarity-associated disease risks, there is much interest in methods to increase low-intensity physical activity. In this context, it is widely assumed that altering posture allocation can modify energy expenditure (EE) to impact body-weight regulation and health. However, we have recently shown the existence of two distinct phenotypes pertaining to the energy cost of standing-with most individuals having no sustained increase in EE during steady-state standing relative to sitting comfortably...
March 4, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28251936/dietary-intake-is-independently-associated-with-the-maximal-capacity-for-fat-oxidation-during-exercise
#13
Gareth Fletcher, Frank F Eves, Elisa I Glover, Scott L Robinson, Carlijn A Vernooij, Janice L Thompson, Gareth A Wallis
Background: Substantial interindividual variability exists in the maximal rate of fat oxidation (MFO) during exercise with potential implications for metabolic health. Although the diet can affect the metabolic response to exercise, the contribution of a self-selected diet to the interindividual variability in the MFO requires further clarification.Objective: We sought to identify whether recent, self-selected dietary intake independently predicts the MFO in healthy men and women.Design: The MFO and maximal oxygen uptake (V̇O2 max) were determined with the use of indirect calorimetry in 305 healthy volunteers [150 men and 155 women; mean ± SD age: 25 ± 6 y; body mass index (BMI; in kg/m(2)): 23 ± 2]...
March 1, 2017: American Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/28244047/oxygen-consumption-rate-and-energy-expenditure-in-mice-indirect-calorimetry
#14
Eun Ran Kim, Qingchun Tong
Global obesity epidemic demands more effective therapeutic treatments and better understanding of obesity pathophysiology. Since obesity results from energy imbalance, accurate quantification of energy intake and energy expenditure (EE) becomes an essential prerequisite to phenotype the cause for obesity development. Indirect calorimetry has long been used as one of the most established methods in EE quantification by detecting changes in levels of O2 consumption and CO2 production. In this article, we describe procedures and important considerations for an effective measurement using indirect calorimetry...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28242789/tm6sf2-rs58542926-variant-affects-postprandial-lipoprotein-metabolism-and-glucose-homeostasis-in-nafld-a-clue-to-the-opposite-impact-of-tm6sf2-variant-on-liver-and-cardio-metabolic-disease
#15
Giovanni Musso, Ugo Cipolla, Maurizio Cassader, Silvia Pinach, Francesca Saba, Franco De Michieli, Elena Paschetta, Daria Bongiovanni, Luciana Framarin, Nicola Leone, Mara Berrutti, Floriano Rosina, Stefania Corvisieri, Federica Molinaro, Antonio Sircana, Roberto Gambino
Mechanisms underlying the opposite effects of TM6SF2 rs58542926 C>T polymorphism on liver injury and cardio-metabolic risk in NAFLD are unclear. We assessed the impact of this polymorphism on postprandial lipoprotein metabolism, glucose homeostasis, and nutrient oxidation in NAFLD. Sixty nonobese, nondiabetic, normolipidemic biopsy-proven NAFLD patients and 60 matched controls genotyped for TM6SF2 C>T polymorphism underwent: indirect calorimetry, an oral fat tolerance test with measurement of plasma lipoprotein subfractions, adipokines, incretin GIP, and an OGTT with Minimal Model analysis of glucose homeostasis...
February 27, 2017: Journal of Lipid Research
https://www.readbyqxmd.com/read/28239405/long-term-intake-of-saccharin-decreases-post-absortive-energy-expenditure-at-rest-and-is-associated-to-greater-weight-gain-relative-to-sucrose-in-wistar-rats
#16
Denise Entrudo Pinto, Kelly Carraro Foletto, Ramiro Barcos Nunes, Pedro Dal Lago, Marcello Casaccia Bertoluci
BACKGROUND: Non-nutritive sweeteners (NNS) have been associated with increased prevalence of obesity. In previous studies, we demonstrated that saccharin could induce an increase in weight gain either when compared to sucrose or to a non-sweetened control at a similar total caloric intake. These data raised the hypothesis that reduced energy expenditure (EE) could be a potential mechanism explaining greater weight gain with saccharin use in rats. The aim of the present study was to compare long-term energy expenditure at rest between rats using saccharin or sucrose and correlate it with weight gain...
2017: Nutrition & Metabolism
https://www.readbyqxmd.com/read/28239404/impact-of-a-6-week-non-energy-restricted-ketogenic-diet-on-physical-fitness-body-composition-and-biochemical-parameters-in-healthy-adults
#17
Paul Urbain, Lena Strom, Lena Morawski, Anja Wehrle, Peter Deibert, Hartmut Bertz
BACKGROUND: The ketogenic diet (KD) is a very low-carbohydrate, high-fat and adequate-protein diet that without limiting calories induces different metabolic adaptations, eg, increased levels of circulating ketone bodies and a shift to lipid metabolism. Our objective was to assess the impact of a 6-week non-energy-restricted KD in healthy adults beyond cohorts of athletes on physical performance, body composition, and blood parameters. METHODS: Our single arm, before-and-after comparison study consisted of a 6-week KD with a previous preparation period including detailed instructions during classes and individual counselling by a dietitian...
2017: Nutrition & Metabolism
https://www.readbyqxmd.com/read/28228715/central-nervous-insulin-administration-before-nocturnal-sleep-decreases-breakfast-intake-in-healthy-young-and-elderly-subjects
#18
João C P Santiago, Manfred Hallschmid
Peripheral insulin acts on the brain to regulate metabolic functions, in particular decreasing food intake and body weight. This concept has been supported by studies in humans relying on the intranasal route of administration, a method that permits the direct permeation of insulin into the CNS without substantial absorption into the blood stream. We investigated if intranasal insulin administration before nocturnal sleep, a period of reduced metabolic activity and largely absent external stimulation, affects food intake and energy turnover on the subsequent morning...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28211258/effects-of-a-wide-range-of-dietary-nicotinamide-riboside-nr-concentrations-on-metabolic-flexibility-and-white-adipose-tissue-wat-of-mice-fed-a-mildly-obesogenic-diet
#19
Wenbiao Shi, Maria A Hegeman, Dorien A M van Dartel, Jing Tang, Manuel Suarez, Hans Swarts, Bart van der Hee, Lluis Arola, Jaap Keijer
SCOPE: Metabolic flexibility is the ability to switch metabolism between carbohydrate oxidation (CHO) and fatty acid oxidation (FAO) and is a biomarker for metabolic health. The effect on metabolic health of nicotinamide riboside (NR) as an exclusive source of vitamin B3 is unknown and is examined here for a wide range of NR. DESIGN AND METHODS: Nine-week-old male C57BL/6JRcc mice received a semi-purified mildly obesogenic (40 en% fat) diet containing 0.14% L-tryptophan and either 5, 15, 30, 180 or 900 mg NR per kg diet for 15 weeks...
February 16, 2017: Molecular Nutrition & Food Research
https://www.readbyqxmd.com/read/28211029/influence-of-segmental-body-composition-and-adiposity-hormones-on-resting-metabolic-rate-and-substrate-utilization-in-overweight-and-obese-adults
#20
K R Hirsch, A E Smith-Ryan, M N M Blue, M G Mock, E T Trexler
PURPOSE: Low resting metabolic rate (RMR) and high carbohydrate reliance at rest are associated with weight gain, but are highly variable in obese individuals. This study determined the relationship of total and segmental body composition and adiposity hormones with RMR and respiratory exchange ratio (RER) in overweight and obese adults. METHODS: In 49 men (n = 23) and premenopausal women (n = 26) [mean ± SD; age = 35.0 ± 8.9 years; body mass index (BMI) = 33...
February 16, 2017: Journal of Endocrinological Investigation
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