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Lanfermeijer M, van Winden LJ, Starreveld DEJ, Razab-Sekh S, Faassen MV, Bleiker EMA, van Rossum HH. An LC-MS/MS-based method for the simultaneous quantification of melatonin, cortisol and cortisone in saliva. Anal Biochem 2024; 689:115496. [PMID: 38431140 DOI: 10.1016/j.ab.2024.115496] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2024] [Revised: 02/23/2024] [Accepted: 02/24/2024] [Indexed: 03/05/2024]
Abstract
Disturbances in the diurnal pattern are associated with several clinical and psychological conditions, including depression and fatigue. Salivary sampling for melatonin, cortisol and cortisone provides a non-invasive method for frequent sampling and obtaining biochemical insight into the diurnal pattern of individuals. Therefore, a new liquid chromatography-tandem mass spectrometry-based method for the measurement of salivary melatonin, cortisol and cortisone was developed and validated. The method required 250 μl saliva, used isotope dilution methodology and was based on a liquid-liquid extraction for sample preparation, reversed-phase chromatography and multiple reaction monitoring on a mass spectrometer for quantitation. The lower limits of quantification obtained were 0.010 nmol/L for melatonin, 0.5 nmol/L for cortisol and 1.00 nmol/L for cortisone and the limits of detection were 0.003 nmol/L, 0.15 nmol/L and 0.1 nmol/L respectively. The method imprecision was ≤14% for all measurands, and the method comparison showed highly comparable results with high correlation coefficients (all ≥0.964). Potential interference of cortisol and cortisone by prednisolone was observed and could be detected by chromatogram review. Typical diurnal patterns for melatonin, cortisol and cortisone were observed in the saliva of 20 cancer survivors who collected saliva throughout the day.
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Affiliation(s)
- Mirthe Lanfermeijer
- Department of Laboratory Medicine, Netherlands Cancer Institute Amsterdam, the Netherlands.
| | - Lennart J van Winden
- Department of Laboratory Medicine, Netherlands Cancer Institute Amsterdam, the Netherlands
| | - Danielle E J Starreveld
- Department of Psychosocial Research and Epidemiology, Netherlands Cancer Institute Amsterdam, the Netherlands
| | - Serry Razab-Sekh
- Department of Laboratory Medicine, Netherlands Cancer Institute Amsterdam, the Netherlands
| | - Martijn van Faassen
- Department of Laboratory Medicine, University Medical Center Groningen, University of Groningen, the Netherlands
| | - Eveline M A Bleiker
- Department of Psychosocial Research and Epidemiology, Netherlands Cancer Institute Amsterdam, the Netherlands
| | - Huub H van Rossum
- Department of Laboratory Medicine, Netherlands Cancer Institute Amsterdam, the Netherlands
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Castro-Quintas Á, Eixarch E, Martin-Gonzalez NS, Daura-Corral M, Marques-Feixa L, Palma-Gudiel H, Rocavert-Barranco M, Miguel-Valero A, Monteserín-García JL, de la Fuente-Tomás L, Crispi F, Arias B, García-Portilla MP, Fañanás L. Diurnal cortisol throughout pregnancy and its association with maternal depressive symptoms and birth outcomes. Psychoneuroendocrinology 2024; 161:106930. [PMID: 38142606 DOI: 10.1016/j.psyneuen.2023.106930] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/14/2023] [Revised: 11/29/2023] [Accepted: 12/13/2023] [Indexed: 12/26/2023]
Abstract
BACKGROUND Depression during pregnancy is a common complication that can negatively affect fetal health and birth outcomes. Cortisol is believed to be a key mediator of this association. Although pregnancy entails a natural increase in cortisol levels, preclinical depression could alter its circadian rhythm, producing excessively high overall diurnal cortisol levels that might be harmful for the fetus and future offspring development. OBJECTIVES Using a prospective longitudinal design, we aimed to study (i) trimestral cortisol circadian rhythm and its overall levels throughout pregnancy in healthy women, (ii) the extent to which maternal depressive symptoms influence both cortisol rhythmicity and overall levels, and (iii) the possible adverse consequences of elevated maternal cortisol on the offspring's weight and gestational age at birth. STUDY DESIGN 112 healthy pregnant women from the general Spanish population were recruited before their first pregnancy. To assess cortisol circadian rhythm, participants provided four saliva samples at each trimester of pregnancy (at awakening, 30 min after awakening, before lunch and before going to bed). Overall cortisol levels were calculated with AUCg approximation. Depressive symptoms were evaluated in each trimester and defined according to EPDS cut-off values (1st trimester, EPDS ≥ 11; 2nd and 3rd trimesters, EPDS ≥ 10). At birth, the risk for low weight, prematurity and weight birth percentile was retrieved for 100 infants. Mixed models and simple effects were employed to study changes of maternal cortisol circadian rhythm and overall levels throughout pregnancy and the possible influence of maternal depressive symptoms. Finally, logistic regressions were performed to assess the associations between maternal overall cortisol levels in each trimester of pregnancy and birth anthropometrics. RESULTS Although overall diurnal cortisol levels increase throughout pregnancy, cortisol circadian rhythm is preserved in all trimesters [1st (F(3110)= 92.565, p < .001), 2nd (F(3,85)= 46.828, p < .001) and 3rd (F(3,90)= 65.555, p < .001)]. However, women with depressive symptoms showed a flattened cortisol circadian pattern only during the second trimester, characterized by a blunted awakening peak and reduced evening decline (F(3,85)= 4.136, p = .009), but not during the first (F(3,11)= 1.676, p = .176) or the third (F(3,90)= 1.089, p = .358) trimesters. Additionally, they did not show a cortisol increase from second to third trimester (p = .636). Finally, higher maternal cortisol levels in second and third trimesters seemed to be associated with increased risk of prematurity (adjusted OR -0.371, 95% CI 0.490-0.972, p = .034) and low birth weight percentile (adjusted OR -0.612, 95% CI 0.348-0.846, p = .007) respectively. CONCLUSION Maternal cortisol levels increased throughout pregnancy, although cortisol circadian rhythm was preserved in all trimesters of pregnancy. However, prenatal depressive symptoms were associated with flattened maternal cortisol circadian rhythm in mid-pregnancy. Therefore, it seems that women with depressive symptoms tended to increase less gradually their cortisol levels from mid to late pregnancy. Finally, higher maternal cortisol levels in mid and late-pregnancy seem to be associated with poorer birth anthropometrics Early detection of depressive symptoms in general population could help to prevent putative obstetrical and birth adverse outcomes.
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Affiliation(s)
- Águeda Castro-Quintas
- Department of Evolutionary Biology, Ecology and Environmental Sciences, Faculty of Biology, University of Barcelona, Barcelona, Spain; Biomedicine Institute of the University of Barcelona (IBUB), Barcelona, Spain; Network Centre for Biomedical Research in Mental Health (CIBER of Mental Health, CIBERSAM), Institute of Health Carlos III, Madrid, Spain
| | - Elisenda Eixarch
- BCNatal - Barcelona Center for Maternal-Fetal and Neonatal Medicine (Hospital Clínic and Hospital Sant Joan de Déu); Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Universitat de Barcelona, Barcelona, Spain; Network Centre for Biomedical Research on Rare Diseases (CIBER of Rare Diseases, CIBERER), Institute of Health Carlos III, Madrid, Spain
| | - Nerea San Martin-Gonzalez
- Department of Evolutionary Biology, Ecology and Environmental Sciences, Faculty of Biology, University of Barcelona, Barcelona, Spain; Biomedicine Institute of the University of Barcelona (IBUB), Barcelona, Spain; Network Centre for Biomedical Research in Mental Health (CIBER of Mental Health, CIBERSAM), Institute of Health Carlos III, Madrid, Spain
| | - Maria Daura-Corral
- Department of Evolutionary Biology, Ecology and Environmental Sciences, Faculty of Biology, University of Barcelona, Barcelona, Spain
| | - Laia Marques-Feixa
- Department of Evolutionary Biology, Ecology and Environmental Sciences, Faculty of Biology, University of Barcelona, Barcelona, Spain; Biomedicine Institute of the University of Barcelona (IBUB), Barcelona, Spain; Network Centre for Biomedical Research in Mental Health (CIBER of Mental Health, CIBERSAM), Institute of Health Carlos III, Madrid, Spain
| | - Helena Palma-Gudiel
- Network Centre for Biomedical Research in Mental Health (CIBER of Mental Health, CIBERSAM), Institute of Health Carlos III, Madrid, Spain; College of Public Health and Health Professions, Department of Epidemiology, University of Florida, United States
| | | | - Alba Miguel-Valero
- Department of Evolutionary Biology, Ecology and Environmental Sciences, Faculty of Biology, University of Barcelona, Barcelona, Spain
| | - Jose Luis Monteserín-García
- Department of Evolutionary Biology, Ecology and Environmental Sciences, Faculty of Biology, University of Barcelona, Barcelona, Spain; Biomedicine Institute of the University of Barcelona (IBUB), Barcelona, Spain; Network Centre for Biomedical Research in Mental Health (CIBER of Mental Health, CIBERSAM), Institute of Health Carlos III, Madrid, Spain
| | - Lorena de la Fuente-Tomás
- Network Centre for Biomedical Research in Mental Health (CIBER of Mental Health, CIBERSAM), Institute of Health Carlos III, Madrid, Spain; Department of Psychiatry, University of Oviedo, Asturias, Spain
| | - Fátima Crispi
- BCNatal - Barcelona Center for Maternal-Fetal and Neonatal Medicine (Hospital Clínic and Hospital Sant Joan de Déu); Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Universitat de Barcelona, Barcelona, Spain; Network Centre for Biomedical Research on Rare Diseases (CIBER of Rare Diseases, CIBERER), Institute of Health Carlos III, Madrid, Spain
| | - Barbara Arias
- Department of Evolutionary Biology, Ecology and Environmental Sciences, Faculty of Biology, University of Barcelona, Barcelona, Spain; Biomedicine Institute of the University of Barcelona (IBUB), Barcelona, Spain; Network Centre for Biomedical Research in Mental Health (CIBER of Mental Health, CIBERSAM), Institute of Health Carlos III, Madrid, Spain
| | - María Paz García-Portilla
- Network Centre for Biomedical Research in Mental Health (CIBER of Mental Health, CIBERSAM), Institute of Health Carlos III, Madrid, Spain; Department of Psychiatry, University of Oviedo, Asturias, Spain; Servicio de Salud del Principado de Asturias (SESPA), Oviedo, Spain
| | - Lourdes Fañanás
- Department of Evolutionary Biology, Ecology and Environmental Sciences, Faculty of Biology, University of Barcelona, Barcelona, Spain; Biomedicine Institute of the University of Barcelona (IBUB), Barcelona, Spain; Network Centre for Biomedical Research in Mental Health (CIBER of Mental Health, CIBERSAM), Institute of Health Carlos III, Madrid, Spain.
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Debono M, Caunt S, Elder C, Fearnside J, Lewis J, Keevil B, Dixon S, Ross R. Real world evidence supports waking salivary cortisone as a screening test for adrenal insufficiency. Clin Endocrinol (Oxf) 2023; 99:517-524. [PMID: 37820012 DOI: 10.1111/cen.14975] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Revised: 08/23/2023] [Accepted: 09/11/2023] [Indexed: 10/13/2023]
Abstract
OBJECTIVE Worldwide, adults and children are at risk of adrenal insufficiency largely due to infectious diseases and adrenal suppression from use of anti-inflammatory glucocorticoids. Home waking salivary cortisone is an accurate screening test for adrenal insufficiency, it has potential to reduce costs, and patients prefer it to the adrenocorticotropin (ACTH) (synacthen) stimulation test. We carried out a service evaluation of home waking salivary cortisone in clinical care to identify implementation barriers. DESIGN, PATIENTS AND MEASUREMENTS Service evaluation in a centre where 212 patients referred for adrenal insufficiency had a waking salivary cortisone. Problems encountered during testing were recorded and patient feedback, via focus groups, collected. RESULTS From all patients providing a waking salivary cortisone 55% had a normal test, 23% adrenal suppression, and 22% an equivocal result requiring a clinical centre ACTH stimulation test. The median (interquartile range [IQR]) for the time of the saliva sample was 07:40 (07:00-08:40). The median (IQR) days between collection and (i) delivery to local laboratory was 1 (0.25-2) day; (ii) reporting by local laboratory was 13 (11-18) days. Patients considered the test is "easy to do" and preferred it to the inpatient ACTH stimulation test. The principal challenge to clinical implementation was results reporting to clinicians due to delays at the local laboratory. CONCLUSIONS This service evaluation provides real-world evidence that home waking salivary cortisone is an effective, practical screening test for adrenal insufficiency. It identified key barriers to testing implementation that need to be addressed when introducing the test to a health service.
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Affiliation(s)
- Miguel Debono
- Department of Endocrinology, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, UK
| | - Sharon Caunt
- Department of Endocrinology, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, UK
| | - Charlotte Elder
- Clinical Medicine, School of Medicine and Population Health, University of Sheffield, Sheffield, UK
| | - Jane Fearnside
- Medical Statistics and Health Economics, School of Health and Related Research, University of Sheffield, Sheffield, UK
| | - Jen Lewis
- Medical Statistics and Health Economics, School of Health and Related Research, University of Sheffield, Sheffield, UK
| | - Brian Keevil
- Department of Biochemistry, Manchester University NHS Foundation Manchester, Manchester, UK
| | - Simon Dixon
- Medical Statistics and Health Economics, School of Health and Related Research, University of Sheffield, Sheffield, UK
| | - Richard Ross
- Clinical Medicine, School of Medicine and Population Health, University of Sheffield, Sheffield, UK
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Richer R, Abel L, Küderle A, Eskofier BM, Rohleder N. CARWatch - A smartphone application for improving the accuracy of cortisol awakening response sampling. Psychoneuroendocrinology 2023; 151:106073. [PMID: 36868094 DOI: 10.1016/j.psyneuen.2023.106073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Revised: 02/22/2023] [Accepted: 02/22/2023] [Indexed: 03/05/2023]
Abstract
BACKGROUND Many studies investigating the cortisol awakening response (CAR) suffer from low adherence to the study protocol as well as from the lack of precise and objective methods for assessing the awakening and saliva sampling times which leads to measurement bias on CAR quantification. METHODS To address this issue, we have developed "CARWatch", a smartphone application that aims to enable low-cost and objective assessment of saliva sampling times as well as to concurrently increase protocol adherence. As proof-of-concept study, we assessed the CAR of N = 117 healthy participants (24.2 ± 8.7 years, 79.5% female) on two consecutive days. During the study, we recorded awakening times (AW) using self-reports, the CARWatch application, and a wrist-worn sensor, and saliva sampling times (ST) using self-reports and the CARWatch application. Using combinations of different AW and ST modalities, we derived different reporting strategies and compared the reported time information to a Naive sampling strategy assuming an ideal sampling schedule. Additionally, we compared the AUCI, computed using information from different reporting strategies, against each other to demonstrate the effect of inaccurate sampling on the CAR. RESULTS The use of CARWatch led to a more consistent sampling behavior and reduced sampling delay compared to self-reported saliva sampling times. Additionally, we observed that inaccurate saliva sampling times, as resulting from self-reports, were associated with an underestimation of CAR measures. Our findings also revealed potential error sources for inaccuracies in self-reported sampling times and showed that CARWatch can help in better identifying, and possibly excluding, sampling outliers that would remain undiscovered by self-reported sampling. CONCLUSION The results from our proof-of-concept study demonstrated that CARWatch can be used to objectively record saliva sampling times. Further, it suggests its potential of increasing protocol adherence and sampling accuracy in CAR studies and might help to reduce inconsistencies in CAR literature resulting from inaccurate saliva sampling. For that reason, we published CARWatch and all necessary tools under an open-source license, making it freely accessible to every researcher.
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Affiliation(s)
- Robert Richer
- Machine Learning and Data Analytics Lab (MaD Lab), Department Artificial Intelligence in Biomedical Engineering (AIBE), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Erlangen, Germany.
| | - Luca Abel
- Machine Learning and Data Analytics Lab (MaD Lab), Department Artificial Intelligence in Biomedical Engineering (AIBE), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Erlangen, Germany
| | - Arne Küderle
- Machine Learning and Data Analytics Lab (MaD Lab), Department Artificial Intelligence in Biomedical Engineering (AIBE), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Erlangen, Germany
| | - Bjoern M Eskofier
- Machine Learning and Data Analytics Lab (MaD Lab), Department Artificial Intelligence in Biomedical Engineering (AIBE), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Erlangen, Germany
| | - Nicolas Rohleder
- Chair of Health Psychology, Institute of Psychology, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Erlangen, Germany
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Tonge JJ, Keevil BG, Craig JN, Whitaker MJ, Ross RJ, Elder CJ. Salivary Steroid Collection in Children Under Conditions Replicating Home Sampling. J Clin Endocrinol Metab 2022; 107:3128-3136. [PMID: 35961299 DOI: 10.1210/clinem/dgac419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/17/2022] [Indexed: 11/19/2022]
Abstract
CONTEXT Measurement of salivary glucocorticoids is an accepted method for testing adrenal function but there are few data on stability during home collection. Current salivary collection techniques require active participation or present a choking hazard and are unsuitable for young children. OBJECTIVE We sought to compare different salivary collection methods; assess the stability of salivary glucocorticoids under conditions replicating home collection; and assess patient tolerability and caregiver acceptability of a salivary collection device for young children, a swab encased in an infant pacifier (SaliPac). METHODS Six healthy adults collected salivary samples using a Salivette Cortisol, passive drool, and SalivaBio at night, waking, and 3 Pm for five days. Time to collect 1-mL saliva using the SalivaBio and SaliPac and caregiver acceptability were assessed in 30 children younger than 6 years. Saliva was stored at 4 °C, room temperature (RT), and 50 °C for 24, 48, 72 hours and 1 week to replicate potential postage conditions. Salivary cortisol and cortisone concentrations were measured by mass spectrometry. RESULTS There was no difference in salivary glucocorticoid concentrations using the 3 collection methods. Salivary cortisol and cortisone were stable for 72 hours at RT and 4 °C, and repeated freeze-thaw cycles did not cause significant degradation. In children younger than 6 years the SalivaBio and SaliPac were well tolerated and collected sufficient saliva for salivary steroid analysis in less than 4 minutes. CONCLUSION Salivette, passive drool, and SalivaBio collect samples with comparable salivary cortisol and cortisone concentrations, which are stable under conditions replicating home collection. SaliPac is an acceptable device for salivary sampling in young children.
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Affiliation(s)
- Joseph J Tonge
- Academic Unit of Medical Education, Medical School, University of Sheffield, S10 2RX Sheffield, UK
| | - Brian G Keevil
- Department of Clinical Biochemistry, University Hospital of South Manchester NHS Trust, M23 9LT Manchester, UK
| | - Jessica N Craig
- Academic Unit of Medical Education, Medical School, University of Sheffield, S10 2RX Sheffield, UK
| | - Martin J Whitaker
- Department of Oncology & Metabolism, University of Sheffield, S10 2RX Sheffield, UK
| | - Richard J Ross
- Department of Oncology & Metabolism, University of Sheffield, S10 2RX Sheffield, UK
| | - Charlotte J Elder
- Department of Oncology & Metabolism, University of Sheffield, S10 2RX Sheffield, UK
- Department of Endocrinology, Sheffield Children's NHS Foundation Trust, S10 2TH Sheffield, UK
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Pedersen J, Rasmussen MGB, Sørensen SO, Mortensen SR, Olesen LG, Brage S, Kristensen PL, Puterman E, Grøntved A. Effects of limiting digital screen use on well-being, mood, and biomarkers of stress in adults. Npj Ment Health Res 2022; 1:14. [PMID: 37521498 PMCID: PMC9554843 DOI: 10.1038/s44184-022-00015-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/12/2022] [Accepted: 09/29/2022] [Indexed: 11/07/2022]
Abstract
Studies have linked higher digital screen use with poorer mental health. However, there is limited experimental evidence to suggest a causal relationship. In this trial, we aimed to investigate the effects of limiting recreational digital screen use on mental well-being, mood, and biomarkers of stress in healthy young and middle-aged adults. We randomly allocated 89 families (including 164 adults) to participate in an extensive screen media reduction intervention or control. Participants in the intervention group were instructed to decrease their recreational screen use to less than 3 hours/week/person. Intervention compliance was assessed using applications and tv-monitors. Overall subjective mental well-being and mood, and collected daily biomarkers of stress (salivary cortisol and cortisone) was assessed at baseline and 2-week follow-up. Reducing recreational digital screen use resulted in significantly improved self-reported well-being and mood in adults allocated to the intervention compared to control. We observed no intervention effects for biomarkers of stress. (ClinicalTrials.gov: NCT04098913, 23/09/2019).
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Affiliation(s)
- Jesper Pedersen
- Department of Sports Science and Clinical Biomechanics, Research unit for Exercise Epidemiology, Centre of Research in Childhood Health, University of Southern Denmark, Odense, Denmark
| | - Martin Gillies Banke Rasmussen
- Department of Sports Science and Clinical Biomechanics, Research unit for Exercise Epidemiology, Centre of Research in Childhood Health, University of Southern Denmark, Odense, Denmark
- Steno Diabetes Center Odense, Odense University Hospital, Odense, Denmark
| | - Sarah Overgaard Sørensen
- Department of Sports Science and Clinical Biomechanics, Research unit for Exercise Epidemiology, Centre of Research in Childhood Health, University of Southern Denmark, Odense, Denmark
| | - Sofie Rath Mortensen
- Department of Sports Science and Clinical Biomechanics, Research unit for Exercise Epidemiology, Centre of Research in Childhood Health, University of Southern Denmark, Odense, Denmark
- Research unit PROgrez, Department of Physiotherapy and Occupational Therapy, Naestved-Slagelse-Ringsted Hospitals, Region Zealand, Denmark
| | - Line Grønholt Olesen
- Department of Sports Science and Clinical Biomechanics, Research unit for Exercise Epidemiology, Centre of Research in Childhood Health, University of Southern Denmark, Odense, Denmark
| | - Søren Brage
- Department of Sports Science and Clinical Biomechanics, Research unit for Exercise Epidemiology, Centre of Research in Childhood Health, University of Southern Denmark, Odense, Denmark
- MRC Epidemiology Unit, University of Cambridge, Cambridge, United Kingdom
| | - Peter Lund Kristensen
- Department of Sports Science and Clinical Biomechanics, Research unit for Exercise Epidemiology, Centre of Research in Childhood Health, University of Southern Denmark, Odense, Denmark
| | - Eli Puterman
- Fitness, Aging, and Stress lab, School of Kinesiology, University of British Columbia, Vancouver, BC Canada
| | - Anders Grøntved
- Department of Sports Science and Clinical Biomechanics, Research unit for Exercise Epidemiology, Centre of Research in Childhood Health, University of Southern Denmark, Odense, Denmark
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