Energy expenditure estimation from respiration variables

Gilgen-Ammann, Rahel; Koller, Marcel; Huber, Céline; Ahola, Riikka; Korhonen, Tapani; Wyss, Thomas

doi:10.1038/s41598-017-16135-5

Cited by 14 publications

(6 citation statements)

References 45 publications

(62 reference statements)

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“…3e, f, studies 3 and 4). Additionally, respiratory rate, which is a parameter that is included in most models of estimation of total energy expenditure based on respiratory function 33 , was not affected by escalating doses of leptin during acute fasting or in fed state ( Fig. 3d and Supplementary Figs.…”

Section: Resultsmentioning

confidence: 99%

Leptin alters energy intake and fat mass but not energy expenditure in lean subjects

et al. 2020

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Based on studies in mice, leptin was expected to decrease body weight in obese individuals. However, the majority of the obese are hyperleptinemic and do not respond to leptin treatment, suggesting the presence of leptin tolerance and questioning the role of leptin as regulator of energy balance in humans. We thus performed detailed novel measurements and analyses of samples and data from our clinical trials biobank to investigate leptin effects on mechanisms of weight regulation in lean normo- and mildly hypo-leptinemic individuals without genetic disorders. We demonstrate that short-term leptin administration alters food intake during refeeding after fasting, whereas long-term leptin treatment reduces fat mass and body weight, and transiently alters circulating free fatty acids in lean mildly hypoleptinemic individuals. Leptin levels before treatment initiation and leptin dose do not predict the observed weight loss in lean individuals suggesting a saturable effect of leptin. In contrast to data from animal studies, leptin treatment does not affect energy expenditure, lipid utilization, SNS activity, heart rate, blood pressure or lean body mass.

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Section: Resultsmentioning

confidence: 99%

Leptin alters energy intake and fat mass but not energy expenditure in lean subjects

et al. 2020

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“…TLC as an absolute measurement related to respiratory volume can be used to address the issue of respiratory and energetic demands in modern humans 44 , 45 and, potentially, in fossil hominins as well 9 , 35 .…”

Section: Discussionmentioning

confidence: 99%

Ribcage measurements indicate greater lung capacity in Neanderthals and Lower Pleistocene hominins compared to modern humans

et al. 2018

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Our most recent fossil relatives, the Neanderthals, had a large brain and a very heavy body compared to modern humans. This type of body requires high levels of energetic intake. While food (meat and fat consumption) is a source of energy, oxygen via respiration is also necessary for metabolism. We would therefore expect Neanderthals to have large respiratory capacities. Here we estimate the pulmonary capacities of Neanderthals, based on costal measurements and physiological data from a modern human comparative sample. The Kebara 2 male had a lung volume of about 9.04 l; Tabun C1, a female individual, a lung volume of 5.85 l; and a Neanderthal from the El Sidrón site, a lung volume of 9.03 l. These volumes are approximately 20% greater than the corresponding volumes of modern humans of the same body size and sex. These results show that the Neanderthal body was highly sensitive to energy supply.

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“…One recent study showed that respiratory signals including respiratory volume and rate could contribute to the estimation of VO 2 during daily physical activities (Gilgen-Ammann et al 2017). In the present experiments, respiratory signals were also collected.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of physiological workload assessment methods using heart rate and accelerometry for a smart wearable system

Yang

Forsman

et al. 2019

Ergonomics

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Work metabolism (WM) can be accurately estimated by oxygen consumption (VO 2 ), which is commonly assessed by heart rate (HR) in field studies. However, the VO 2 -HR relationship is influenced by individual capacity and activity characteristics. The purpose of this study was to evaluate three models for estimating WM compared with indirect calorimetry, during simulated work activities. The techniques were: the HR-Flex model; HR branched model, combining HR with hipworn accelerometers (ACC); and HR þ arm-leg ACC model, combining HR with wrist-and thighworn ACC. Twelve participants performed five simulated work activities and three submaximal tests. The HR þ arm-leg ACC model had the overall best performance with limits of agreement (LoA) of À3.94 and 2.00 mL/min/kg, while the HR-Flex model had À5.01 and 5.36 mL/min/kg and the branched model, À6.71 and 1.52 mL/min/kg. In conclusion, the HR þ arm-leg ACC model should, when feasible, be preferred in wearable systems for WM estimation.Practitioner Summary: Work with high energy demand can impair employees' health and life quality. Three models were evaluated for estimating work metabolism during simulated tasks. The model combining heart rate, wrist-and thigh-worn accelerometers showed the best accuracy. This is, when feasible, suggested for wearable systems to assess work metabolism.Abbreviations: ACC: accelerometer; EE: energy expenditure; HR: heart rate; LoA: limits of agreement; RAS: relative aerobic strain; REE: resting energy expenditure; RHR: resting heart rate; VO2: oxygen consumption; WM: work metabolism ARTICLE HISTORY

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Energy expenditure estimation from respiration variables

Cited by 14 publications

References 45 publications

Leptin alters energy intake and fat mass but not energy expenditure in lean subjects

Leptin alters energy intake and fat mass but not energy expenditure in lean subjects

Ribcage measurements indicate greater lung capacity in Neanderthals and Lower Pleistocene hominins compared to modern humans

Evaluation of physiological workload assessment methods using heart rate and accelerometry for a smart wearable system

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