Metabolism Review

Meting

Mátning av menniskjalig orkuútreiðslu

Metaboliska tíð er ein av teimum mest mátaðu tingunum um teg, og ein av teimum mest misvísandi.

Uppdatert 3 min lesing 40 tilvísingar Dokumentasjonsstyrkur 5/5

Blóðsykurmælar við einari próvstriku sett í portið
Roy Zuo · CC BY-SA 4.0 · Wikimedia Commons

Teir fýra komponentarnir

Hvat tín dagliga orkuútreiðsla er gjørd av
KomponenturUmleiðHvussu breytilig
Hvíldar metaboliska tíð60-70% av samlaðaÍ stóran mun avmarkað av fettfríum massa
Hit av mat~10% av inntøkuMildari hægri á høgum protein kostum
Fysisk aktivitetMikið breytiligHvat tú avvarðandi gert
Ikki-fysisk aktivitet (NEAT)Tann villiBreyttir fleiri ferðir millum fólk og innan ein persón

NEAT er har flestu genuine millum-fólk breytir búgva — fidgeting, støða, spontane rørslur. Tað er eisini komponenturin, sum fellur stilla undir ein kost, sum er ein stórur partur av tí fólk uppliva sum teirra metabolismu "seinkar".

Tvøttað vatn

Viðmiðaða aðferðin arbeiðir við at fáa teg at drekka vatn merkt við stabilum isotopum av vetni og súrefni, og síðan fylgja teirra mismunandi útskilnað. Munurin millum teirra speglar kolvdioksid framleiðslu, og tí orkuútreiðslu, yvir eina til tveir vikur av vanligum lívi. Tað er dýrt og tað er ófrágreiðanligt.

Eitt systematiskt yvirlit av samlaðu orkuútreiðslu mátað á hendan hátt hjá vaksnum gevur núverandi mynd [2], og samansetta greiningar hava framleitt uppskot um bæði hvíldar og samlaða útreiðslu yvir fólkasløg [4][5]. Arbeiði hjá børnum við kroniskum sjúkum vísir sama metodologi brúkt har fyrimyndarútreiðslur mistega harðast [1].

Doubly labelled water sum viðmiðaða aðferð

Hvørja orsøk hevur tín fitness tracker ikki samtykt við tín app

Ein meta-greining valideraði kostvøttingar metoder móti doubly labelled water [3]. Funnurin er óbehagiligur og samanhangandi: fólk undirfrágreiða inntøku nógv, og undirfrágreiðingin er størri hjá fólki við hægri kroppsvøtt. Tað er ikki av ásettu sviki — partur meting er veruliga torfør, og eingin matardagbók fanga matolju nákvæmlega.

Á útreiðslusíðuni, fyrimyndarútreiðslur vórðu samanborin systematiskt hjá heilsufólki og í ítróttarfólki, og bestu venjingarráðgeving finst fyri at máta hvíldar metaboliska tíð ordiliga. Allar eru fólkasløg miðal við einstaklings feil barir av nøkrum hundrað kilokaloríum.

Orku tøka, ikki bara inntøka

Ein serligur hugtak hevur týdning fyri hvørjum, sum venur álvarsliga: orku tøka er inntøka mínus fysisk útreiðsla, í mun til fettfrían massa. Kroniskt lágt tøka undirgrýtir fysiologiska virkni væl áðrenn tað sær út sum ein etandi sjúka. Ein randomiseraður roynd fann at lágt orku tøka minkaði myofibrillar og sarcoplasmic protein syntesi, og kostvøttingar íløgur hava verið royndar at taka á tað.

Søvn interagerar við alt hetta — søvn avmarking broytti vekt-taps samanseting í einari randomiseraðari roynd, og søvn útviding broytti objektivt mátaða orku inntøku [6]. Meira um okkara søvn evidens heimasíðu.

Broyttir kost samanseting útreiðslu?

Lítla, og størðin av ávirkanini er veruliga umstridd. Ein áberandi randomiserað roynd granskaði orkuútreiðslu undir vekt-taps viðlíkahald á einum lágarbóka kost [7] og boðaði um eina mun; greiningin er nógv umrøtt síðan. Honesta samandrátturin er at hvør ávirkan er lítil í mun til munin millum hvat fólk halda tey eta og hvat tey eta.

Vanlig spurningar

Havi eg ein seinan evnaskifti?
Næstan sikkurt ikki í eini mun, ið greiðir eitt tyngdar-trupulleika. Atlagað fyri likamssamansetning broytist hvíldar-evnaskiftisferðin nógv minni millum fólk enn hildið verður – og mátingar-mistøk í inntøku-eltan er nógv størri.
Er ein evnaskifti-royndarpróvan á einum stovi ómakans verd?
Óbein kalorimetri kann vera neyv, um hon verður framd undir rættum treytum – fastandi, hvíld, rætt kalibrerað. Mesta handilsliga roynd lýkur ikki hesar treytir.
Hækkar tað evnaskiftið at eta ofta?
Nei. Tann termiski ávirkanin av mati skalast eftir, hvussu nógv tú etur, ikki eftir, hvussu nógvar ferðir tú deilir tað í.
Hví steðgaði tyngdartap mítt?
Orkubrúk fellur, sum massin fellur, og inntøka rekur upp á, sum ágávan doðnar. Báðar eru vanligar. Sí metaboliska tillaging.
Glúkosa-málarí og tilhoyrandi útgerð sett á ein flatan yvirflatu
Roy Zuo · CC BY-SA 4.0 · Wikimedia Commons

Tengt lesing

Evidensin fyri hesa síðu Ein stakkur, sum vísir samansetingina av teimum 18 útgávunum, ið eru nevndar á hesi síðu, eftir rannsóknartypi. 9144meta-analysis (9)randomised trial (14)review (1)other (4)
28 útgávur, 1989–2025. Hetta er ein blanding av bæði royndum og samansetingum, sum er støðan, har frá ein áheitan um orsøkin er skilvís. Kelda: egnu tilvísingalistin á hesi síðu, niðanfyri.

Viðmerkingar

Hver einasta tilvísing niðanfyri bendir til upprunaliga peer-reviewed skjalið á PubMed ella gjøgnum DOI. Einki her er ein staðfesting fyri læknaligt ráð.

  1. Describing Energy Expenditure in Children with a Chronic Disease: A Systematic Review Luo B, Davidson ZE, O'Brien K, et al. · Advances in nutrition (Bethesda, Md.) · 2024 · Systematic review DOIPubMed 38432591Full text
  2. Total energy expenditure measured using doubly labeled water in adults with major chronic diseases: a systematic review Purcell SA, Craven SA, Limon-Miro AT, et al. · The American journal of clinical nutrition · 2024 · Systematic review DOIPubMed 39209153Full text
  3. Validity of dietary assessment methods compared with doubly labeled water in children: A systematic review and meta-analysis Mehranfar S, Jalilpiran Y, Jafari A, et al. · Obesity reviews : an official journal of the International Association for the Study of Obesity · 2024 · Meta-analysis DOIPubMed 38783784
  4. Estimates of Resting Energy Expenditure and Total Energy Expenditure Using Predictive Equations for Individuals After Bariatric Surgery: a Systematic Review with Meta-analysis Macena ML, Silva Júnior AE, Melo JM, et al. · Obesity surgery · 2023 · Meta-analysis DOIPubMed 37889369
  5. Accuracy of Resting Metabolic Rate Prediction Equations in Athletes: A Systematic Review with Meta-analysis O'Neill JER, Corish CA, Horner K · Sports medicine (Auckland, N.Z.) · 2023 · Meta-analysis DOIPubMed 37632665Full text
  6. Estimates of resting energy expenditure and total energy expenditure using predictive equations in adults with overweight and obesity: a systematic review with meta-analysis Macena ML, Paula DTDC, da Silva Júnior AE, et al. · Nutrition reviews · 2022 · Meta-analysis DOIPubMed 35551409
  7. Physical activity and incident type 2 diabetes mellitus: a systematic review and dose-response meta-analysis of prospective cohort studies Smith AD, Crippa A, Woodcock J, et al. · Diabetologia · 2016 · Meta-analysis DOIPubMed 27747395Full text
  8. Estimating activity energy expenditure: how valid are physical activity questionnaires? Neilson HK, Robson PJ, Friedenreich CM, et al. · The American journal of clinical nutrition · 2008 · Meta-analysis DOIPubMed 18258615
  9. Best practice methods to apply to measurement of resting metabolic rate in adults: a systematic review Compher C, Frankenfield D, Keim N, et al. · Journal of the American Dietetic Association · 2006 · Systematic review DOIPubMed 16720129
  10. Comparison of predictive equations for resting metabolic rate in healthy nonobese and obese adults: a systematic review Frankenfield D, Roth-Yousey L, Compher C · Journal of the American Dietetic Association · 2005 · Systematic review DOIPubMed 15883556
  11. Acute mild cold exposure with shivering reduces 24 h glucose levels in individuals with type 2 diabetes but not prediabetes Hashim D, Jörgensen JA, van de Weijer T, et al. · Diabetologia · 2026 · Randomised controlled trial DOIPubMed 42474505Full text
  12. Protein yogurt and whey protein produce comparable muscle gains, but divergent microbiome shifts during strength training in older adults Monsalves-Álvarez M, Calderón-Romero P, Hayes-Ortiz T, et al. · Scientific reports · 2026 · Randomised controlled trial DOIPubMed 42151371Full text
  13. Adaptive Thermogenesis After Hypocaloric Low-Carbohydrate Versus Low-Fat Diets in African American Women: A Secondary Analysis Lopez Torres SY, Gower BA, Garvey WT, et al. · Obesity (Silver Spring, Md.) · 2025 · Randomised controlled trial DOIPubMed 40931394Full text
  14. Measuring dietary intake among participants with a urea cycle disorder using standard diet records or a novel food photography app Sim E, Gregor A, MacLeod E, et al. · Molecular genetics and metabolism · 2025 · Randomised controlled trial DOIPubMed 41242089Full text
  15. The effect of nutrition education sessions on energy availability, body composition, eating attitude and sports nutrition knowledge in young female endurance athletes Tektunalı Akman C, Gönen Aydın C, Ersoy G · Frontiers in public health · 2024 · Randomised controlled trial DOIPubMed 38550312Full text
  16. Low energy availability reduces myofibrillar and sarcoplasmic muscle protein synthesis in trained females Oxfeldt M, Phillips SM, Andersen OE, et al. · The Journal of physiology · 2023 · Randomised controlled trial DOIPubMed 37329147
  17. Effect of Sleep Extension on Objectively Assessed Energy Intake Among Adults With Overweight in Real-life Settings: A Randomized Clinical Trial Tasali E, Wroblewski K, Kahn E, et al. · JAMA internal medicine · 2022 · Randomised controlled trial DOIPubMed 35129580Full text
  18. Energy balance in hypothalamic obesity in response to treatment with a once-weekly GLP-1 receptor agonist Shoemaker AH, Silver HJ, Buchowski M, et al. · International journal of obesity (2005) · 2022 · Randomised controlled trial DOIPubMed 34975146Full text
  19. Influence of sleep restriction on weight loss outcomes associated with caloric restriction Wang X, Sparks JR, Bowyer KP, et al. · Sleep · 2018 · Randomised controlled trial DOIPubMed 29438540Full text
  20. Effects of a low carbohydrate diet on energy expenditure during weight loss maintenance: randomized trial Ebbeling CB, Feldman HA, Klein GL, et al. · BMJ (Clinical research ed.) · 2018 · Randomised controlled trial DOIPubMed 30429127Full text
  21. Does exercise training affect resting metabolic rate in adolescents with obesity? Alberga AS, Prud'homme D, Sigal RJ, et al. · Applied physiology, nutrition, and metabolism = Physiologie appliquee, nutrition et metabolisme · 2017 · Randomised controlled trial DOIPubMed 27923279
  22. A 2-Year Randomized Controlled Trial of Human Caloric Restriction: Feasibility and Effects on Predictors of Health Span and Longevity Ravussin E, Redman LM, Rochon J, et al. · The journals of gerontology. Series A, Biological sciences and medical sciences · 2015 · Randomised controlled trial DOIPubMed 26187233Full text
  23. The influence of nighttime feeding of carbohydrate or protein combined with exercise training on appetite and cardiometabolic risk in young obese women Ormsbee MJ, Kinsey AW, Eddy WR, et al. · Applied physiology, nutrition, and metabolism = Physiologie appliquee, nutrition et metabolisme · 2015 · Randomised controlled trial DOIPubMed 25409324
  24. Reading and listening to music increase resting energy expenditure during an indirect calorimetry test Snell B, Fullmer S, Eggett DL · Journal of the Academy of Nutrition and Dietetics · 2014 · Randomised controlled trial DOIPubMed 24794837
  25. Appetite control and biomarkers of satiety with vegetarian (soy) and meat-based high-protein diets for weight loss in obese men: a randomized crossover trial Neacsu M, Fyfe C, Horgan G, et al. · The American journal of clinical nutrition · 2014 · Randomised controlled trial DOIPubMed 24944057
  26. The doubly labeled water method produces highly reproducible longitudinal results in nutrition studies Wong WW, Roberts SB, Racette SB, et al. · The Journal of nutrition · 2014 · Randomised controlled trial DOIPubMed 24523488Full text
  27. Impact of energy restriction with or without resistance training on energy metabolism in overweight and obese postmenopausal women: a Montreal Ottawa New Emerging Team group study St-Onge M, Rabasa-Lhoret R, Strychar I, et al. · Menopause (New York, N.Y.) · 2013 · Randomised controlled trial DOIPubMed 22968252
  28. Caffeine intake, short bouts of physical activity, and energy expenditure: a double-blind randomized crossover trial Júdice PB, Matias CN, Santos DA, et al. · PloS one · 2013 · Randomised controlled trial DOIPubMed 23869233Full text
  29. Effect of dietary protein content on weight gain, energy expenditure, and body composition during overeating: a randomized controlled trial Bray GA, Smith SR, de Jonge L, et al. · JAMA · 2012 · Randomised controlled trial DOIPubMed 22215165Full text
  30. Validation of a pre-coded food record for infants and young children Gondolf UH, Tetens I, Hills AP, et al. · European journal of clinical nutrition · 2012 · Randomised controlled trial DOIPubMed 21829216
  31. Approaches for quantifying energy intake and %calorie restriction during calorie restriction interventions in humans: the multicenter CALERIE study Racette SB, Das SK, Bhapkar M, et al. · American journal of physiology. Endocrinology and metabolism · 2012 · Randomised controlled trial DOIPubMed 22127229Full text
  32. Calcium and dairy product modulation of lipid utilization and energy expenditure Teegarden D, White KM, Lyle RM, et al. · Obesity (Silver Spring, Md.) · 2008 · Randomised controlled trial DOIPubMed 18421269
  33. Training, muscle volume, and energy expenditure in nonobese American girls Eliakim A, Scheett T, Allmendinger N, et al. · Journal of applied physiology (Bethesda, Md. : 1985) · 2001 · Randomised controlled trial DOIPubMed 11133891
  34. Components of total energy expenditure in healthy young women are not affected after 14 days of feeding with medium-versus long-chain triglycerides Papamandjaris AA, White MD, Jones PJ · Obesity research · 1999 · Randomised controlled trial DOIPubMed 10348498
  35. Validity and reliability of reported dietary intake data Howat PM, Mohan R, Champagne C, et al. · Journal of the American Dietetic Association · 1994 · Randomised controlled trial DOIPubMed 8300993
  36. Use of the doubly labeled water method for measurement of energy expenditure, total body water, water intake, and metabolizable energy intake in humans and small animals Roberts SB · Canadian journal of physiology and pharmacology · 1989 · Review DOIPubMed 2692794
  37. Energy expenditure and obesity across the economic spectrum McGrosky A, Luke A, Arab L, et al. · Proceedings of the National Academy of Sciences of the United States of America · 2025 · Journal article DOIPubMed 40658837Full text
  38. Training volume and total energy expenditure of an Olympic and Ironman world champion: approaching the upper limits of human capabilities Dasa MS, Bu OA, Sandbakk Ø, et al. · Journal of applied physiology (Bethesda, Md. : 1985) · 2024 · Journal article DOIPubMed 39480269
  39. Constrained Total Energy Expenditure and Metabolic Adaptation to Physical Activity in Adult Humans Pontzer H, Durazo-Arvizu R, Dugas LR, et al. · Current biology : CB · 2016 · Journal article DOIPubMed 26832439Full text
  40. Compendium of physical activities: an update of activity codes and MET intensities Ainsworth BE, Haskell WL, Whitt MC, et al. · Medicine and science in sports and exercise · 2000 · Journal article DOIPubMed 10993420

Henda síða varð sjálvvirkandi týdd úr enskt. Tilvísingarnar og tølini eru óbroytt. Les upprunaliga enska útgávuna um nakað lesist undarliga. Les upprunaliga enska útgávuna