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Nikanorova AA, Barashkov NA, Pshennikova VG, Teryutin FM, Nakhodkin SS, Solovyev AV, Romanov GP, Burtseva TE, Fedorova SA. A Systematic Review and Meta-Analysis of Free Triiodothyronine (FT3) Levels in Humans Depending on Seasonal Air Temperature Changes: Is the Variation in FT3 Levels Related to Nonshivering Thermogenesis? Int J Mol Sci 2023; 24:14052. [PMID: 37762355 PMCID: PMC10531421 DOI: 10.3390/ijms241814052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Revised: 09/08/2023] [Accepted: 09/11/2023] [Indexed: 09/29/2023] Open
Abstract
Thyroid hormones play a crucial role in regulating normal development, growth, and metabolic function. However, the controversy surrounding seasonal changes in free triiodothyronine (FT3) levels remains unresolved. Therefore, the aim of this study was to conduct a systematic review and meta-analysis of variations in FT3 levels in relation to seasonal air temperatures in the context of current knowledge about its role in nonshivering thermogenesis. Ten eligible articles with a total of 336,755 participants were included in the meta-analysis. The studies were categorized into two groups based on the air temperature: "Cold winter", where the winter temperature fell below 0 °C, and "Warm winter", where the winter temperature was above 0 °C. The analysis revealed that in cold regions, FT3 levels decreased in winter compared to summer (I2 = 57%, p < 0.001), whereas in warm regions, FT3 levels increased during winter (I2 = 28%, p < 0.001). These findings suggest that seasonal variations in FT3 levels are likely to be influenced by the winter temperature. Considering the important role of the FT3 in the nonshivering thermogenesis process, we assume that this observed pattern is probably related to the differences in use of thyroid hormones in the brown adipose tissue during adaptive thermogenesis, which may depend on intensity of cold exposure.
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Affiliation(s)
- Alena A. Nikanorova
- Yakut Science Centre of Complex Medical Problems, Yaroslavskogo 6/3, 677000 Yakutsk, Russia; (A.A.N.); (V.G.P.); (F.M.T.); (T.E.B.); (S.A.F.)
| | - Nikolay A. Barashkov
- Yakut Science Centre of Complex Medical Problems, Yaroslavskogo 6/3, 677000 Yakutsk, Russia; (A.A.N.); (V.G.P.); (F.M.T.); (T.E.B.); (S.A.F.)
| | - Vera G. Pshennikova
- Yakut Science Centre of Complex Medical Problems, Yaroslavskogo 6/3, 677000 Yakutsk, Russia; (A.A.N.); (V.G.P.); (F.M.T.); (T.E.B.); (S.A.F.)
| | - Fedor M. Teryutin
- Yakut Science Centre of Complex Medical Problems, Yaroslavskogo 6/3, 677000 Yakutsk, Russia; (A.A.N.); (V.G.P.); (F.M.T.); (T.E.B.); (S.A.F.)
| | - Sergey S. Nakhodkin
- M.K. Ammosov North-Eastern Federal University, Kulakovskogo 46, 677013 Yakutsk, Russia; (S.S.N.); (A.V.S.); (G.P.R.)
| | - Aisen V. Solovyev
- M.K. Ammosov North-Eastern Federal University, Kulakovskogo 46, 677013 Yakutsk, Russia; (S.S.N.); (A.V.S.); (G.P.R.)
| | - Georgii P. Romanov
- M.K. Ammosov North-Eastern Federal University, Kulakovskogo 46, 677013 Yakutsk, Russia; (S.S.N.); (A.V.S.); (G.P.R.)
| | - Tatiana E. Burtseva
- Yakut Science Centre of Complex Medical Problems, Yaroslavskogo 6/3, 677000 Yakutsk, Russia; (A.A.N.); (V.G.P.); (F.M.T.); (T.E.B.); (S.A.F.)
- M.K. Ammosov North-Eastern Federal University, Kulakovskogo 46, 677013 Yakutsk, Russia; (S.S.N.); (A.V.S.); (G.P.R.)
| | - Sardana A. Fedorova
- Yakut Science Centre of Complex Medical Problems, Yaroslavskogo 6/3, 677000 Yakutsk, Russia; (A.A.N.); (V.G.P.); (F.M.T.); (T.E.B.); (S.A.F.)
- M.K. Ammosov North-Eastern Federal University, Kulakovskogo 46, 677013 Yakutsk, Russia; (S.S.N.); (A.V.S.); (G.P.R.)
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Kuzmenko NV, Tsyrlin VA, Pliss MG. Seasonal Dynamics of Melatonin, Prolactin,
Sex Hormones and Adrenal Hormones in Healthy People: a Meta-Analysis. J EVOL BIOCHEM PHYS+ 2021. [DOI: 10.1134/s0022093021030029] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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Özçürümez MK, Haeckel R. Biological variables influencing the estimation of reference limits. Scandinavian Journal of Clinical and Laboratory Investigation 2018; 78:337-345. [PMID: 29764232 DOI: 10.1080/00365513.2018.1471617] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Reference limits (RLs) are required to evaluate laboratory results for medical decisions. The establishment of RL depends on the pre-analytical and the analytical conditions. Furthermore, biological characteristics of the sub-population chosen to provide the reference samples may influence the RL. The most important biological preconditions are gender, age, chronobiological influences, posture, regional and ethnic effects. The influence of these components varies and is often neglected. Therefore, a list of biological variables is collected from the literature and their influence on the estimation of RL is discussed. Biological preconditions must be specified if RL are reported as well for directly as for indirectly estimated RL. The influence of biological variables is especially important if RL established by direct methods are compared with those derived from indirect techniques. Even if these factors are not incorporated into the estimation of RL, their understanding can assist the interpretation of laboratory results of an individual.
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Affiliation(s)
- Mustafa K Özçürümez
- a IMD-Oderland GmbH , Frankfurt (Oder) , Germany.,b Institut für Klinische Chemie Medizinische Fakultät Mannheim der Universität Heidelberg , Mannheim , Germany
| | - Rainer Haeckel
- c Bremer Zentrum für Laboratoriumsmedizin Klinikum Bremen Mitte , Bremen , Germany
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Milas G, Šupe-Domić D, Drmić-Hofman I, Rumora L, Klarić IM. Weather conditions: a neglected factor in human salivary cortisol research? INTERNATIONAL JOURNAL OF BIOMETEOROLOGY 2018; 62:165-175. [PMID: 28884366 DOI: 10.1007/s00484-017-1436-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2016] [Revised: 08/24/2017] [Accepted: 08/24/2017] [Indexed: 06/07/2023]
Abstract
There is ample evidence that environmental stressors such as extreme weather conditions affect animal behavior and that this process is in part mediated through the elevated activity of the hypothalamic pituitary adrenal axis which results in an increase in cortisol secretion. This relationship has not been extensively researched in humans, and weather conditions have not been analyzed as a potential confounder in human studies of stress. Consequently, the goal of this paper was to assess the relationship between salivary cortisol and weather conditions in the course of everyday life and to test a possible moderating effect of two weather-related variables, the climate region and timing of exposure to outdoors conditions. The sample consisted of 903 secondary school students aged 18 to 21 years from Mediterranean and Continental regions. Cortisol from saliva was sampled in naturalistic settings at three time points over the course of a single day. We found that weather conditions are related to salivary cortisol concentration and that this relationship may be moderated by both the specific climate and the anticipation of immediate exposure to outdoors conditions. Unpleasant weather conditions are predictive for the level of salivary cortisol, but only among individuals who anticipate being exposed to it in the immediate future (e.g., in students attending school in the morning shift). We also demonstrated that isolated weather conditions or their patterns may be relevant in one climate area (e.g., Continental) while less relevant in the other (e.g., Mediterranean). Results of this study draw attention to the importance of controlling weather conditions in human salivary cortisol research.
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Affiliation(s)
- Goran Milas
- Centre for Research on Interindividual Differences, Institute of Social Sciences "Ivo Pilar", Zagreb, Croatia
| | - Daniela Šupe-Domić
- Department of Medical Laboratory Diagnostics, University Hospital Centre Split, Split, Croatia
| | - Irena Drmić-Hofman
- Department of Pathology, Forensic Medicine and Cytology, University Hospital Centre Split, Split, Croatia
- Department of Medical Chemistry and Biochemistry, University of Split School of Medicine, Split, Croatia
| | - Lada Rumora
- Department of Medical Biochemistry and Hematology, Faculty of Pharmacy and Biochemistry, University of Zagreb, Zagreb, Croatia
| | - Irena Martinović Klarić
- Centre for Research in Social Inequalities and Sustainability, Institute for Social Research in Zagreb, Amruševa 11/II, 10000, Zagreb, Croatia.
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Miller R, Stalder T, Jarczok M, Almeida DM, Badrick E, Bartels M, Boomsma DI, Coe CL, Dekker MCJ, Donzella B, Fischer JE, Gunnar MR, Kumari M, Lederbogen F, Power C, Ryff CD, Subramanian SV, Tiemeier H, Watamura SE, Kirschbaum C. The CIRCORT database: Reference ranges and seasonal changes in diurnal salivary cortisol derived from a meta-dataset comprised of 15 field studies. Psychoneuroendocrinology 2016; 73:16-23. [PMID: 27448524 PMCID: PMC5108362 DOI: 10.1016/j.psyneuen.2016.07.201] [Citation(s) in RCA: 133] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/24/2016] [Revised: 07/12/2016] [Accepted: 07/12/2016] [Indexed: 11/20/2022]
Abstract
Diurnal salivary cortisol profiles are valuable indicators of adrenocortical functioning in epidemiological research and clinical practice. However, normative reference values derived from a large number of participants and across a wide age range are still missing. To fill this gap, data were compiled from 15 independently conducted field studies with a total of 104,623 salivary cortisol samples obtained from 18,698 unselected individuals (mean age: 48.3 years, age range: 0.5-98.5 years, 39% females). Besides providing a descriptive analysis of the complete dataset, we also performed mixed-effects growth curve modeling of diurnal salivary cortisol (i.e., 1-16h after awakening). Cortisol decreased significantly across the day and was influenced by both, age and sex. Intriguingly, we also found a pronounced impact of sampling season with elevated diurnal cortisol in spring and decreased levels in autumn. However, the majority of variance was accounted for by between-participant and between-study variance components. Based on these analyses, reference ranges (LC/MS-MS calibrated) for cortisol concentrations in saliva were derived for different times across the day, with more specific reference ranges generated for males and females in different age categories. This integrative summary provides important reference values on salivary cortisol to aid basic scientists and clinicians in interpreting deviations from the normal diurnal cycle.
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Affiliation(s)
- Robert Miller
- Institute of General Psychology, Biopsychology and Psychological Methods, Technische Universität Dresden, Zellescher Weg 19, D-01069 Dresden, Germany.
| | - Tobias Stalder
- Institute of General Psychology, Biopsychology and Psychological Methods, Technische Universität Dresden, Zellescher Weg 19, D-01069 Dresden, Germany
| | - Marc Jarczok
- Mannheim Institute of Public Health, Ludolf-Krehl-Str. 7-11, D-68167 Mannheim, Germany
| | - David M Almeida
- College of Heath and Human Development, The Pennsylvania State University, University Park PA 16802, USA
| | - Ellena Badrick
- MRC Health eResearch Centre, The Farr Institute of Health Informatics Research, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - Meike Bartels
- Department of Biological Psychology, Vrije Universiteit Amsterdam, van der Boechorststraat 1, 1081 BT Amsterdam, Netherlands
| | - Dorret I Boomsma
- Department of Biological Psychology, Vrije Universiteit Amsterdam, van der Boechorststraat 1, 1081 BT Amsterdam, Netherlands
| | - Christopher L Coe
- Department of Psychology, University of Wisconsin, 1202W. Johnson Street, Madison, WI 53706-1969, USA
| | - Marieke C J Dekker
- Department of Epidemiology, Erasmus Medical Center, Gravendijkwal 230, 3015 CE, Rotterdam, Netherlands
| | - Bonny Donzella
- Institute of Child Development, University of Minnesota, 51 East River Parkway, Minneapolis, MN 55455, USA
| | - Joachim E Fischer
- Mannheim Institute of Public Health, Ludolf-Krehl-Str. 7-11, D-68167 Mannheim, Germany
| | - Megan R Gunnar
- Institute of Child Development, University of Minnesota, 51 East River Parkway, Minneapolis, MN 55455, USA
| | - Meena Kumari
- ISER, University of Essex, Wivenhoe Park, Colchester, Essex CO4 3SQ, United Kingdom
| | - Florian Lederbogen
- Central Institute of Mental Health, University of Heidelberg, Medical Faculty Mannheim, J5, D-68159 Mannheim, Germany
| | - Christine Power
- Population, Policy and Practice, UCL Institute of Child Health, University College London, 30 Guilford Street, London WC1N 1EH, United Kingdom
| | - Carol D Ryff
- Department of Psychology, University of Wisconsin, 1202W. Johnson Street, Madison, WI 53706-1969, USA
| | - S V Subramanian
- Department of Society, Human Development and Health, Harvard School of Public Health, 677 Huntington Avenue, Boston, MA 02115-6096, USA
| | - Henning Tiemeier
- Department of Epidemiology, Erasmus Medical Center, Gravendijkwal 230, 3015 CE, Rotterdam, Netherlands; Department of Psychiatry, Erasmus Medical Center, Gravendijkwal 230, 3015 CE, Rotterdam, Netherlands
| | - Sarah E Watamura
- Department of Psychology, University of Denver, 2155S. Race Street, Denver, CO 802058, USA
| | - Clemens Kirschbaum
- Institute of General Psychology, Biopsychology and Psychological Methods, Technische Universität Dresden, Zellescher Weg 19, D-01069 Dresden, Germany
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Butalia S, Johnson JA, Ghali WA, Southern DA, Rabi DM. Temporal variation of diabetic ketoacidosis and hypoglycemia in adults with type 1 diabetes: A nationwide cohort study. J Diabetes 2016; 8:552-8. [PMID: 26301804 DOI: 10.1111/1753-0407.12336] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/24/2015] [Revised: 05/16/2015] [Accepted: 08/19/2015] [Indexed: 12/19/2022] Open
Abstract
BACKGROUND Seasonality in health outcomes has long been recognized for conditions such as colds and flus. The aim of the present study was to determine whether hospitalizations for acute complications of type 1 diabetes (T1D) vary by month and season. METHODS An observational study was performed of national administrative health data. Hospitalizations for acute complications in adults (aged ≥18 years) with T1D were identified using ICD-10 (Canadian revision) codes between 2004 and 2010. Monthly and seasonal counts per year were determined for the study period. For each acute complication, the ratio of the number of observed hospitalizations/expected number of hospitalizations was calculated for each month and season per year, adjusting for varied lengths of month, season, and year. RESULTS In all, there were 21 568 hospitalizations for diabetic ketoacidosis (DKA) and 5349 hospitalizations for hypoglycemia during the study period. December had higher than expected hospitalizations for DKA and March had higher than expected hospitalizations for hypoglycemia. There did not appear to be variation for either DKA or hypoglycemia hospitalizations by season. CONCLUSIONS The results of the present study suggest temporal variation in hospitalizations for DKA and hypoglycemia, and therefore signal important times of patient vulnerability. Potential mechanisms underlying this pattern warrant further examination. Prevention strategies and resources for patients with T1D may need to be increased at specific times during the year.
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Affiliation(s)
| | | | - William A Ghali
- Cardiac Sciences, Faculty of Medicine, University of Calgary, Calgary
| | | | - Doreen M Rabi
- Cardiac Sciences, Faculty of Medicine, University of Calgary, Calgary
- Department of Public Health Sciences, University of Alberta, Edmonton, Canada
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7
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Gliemann L, Gunnarsson TP, Hellsten Y, Bangsbo J. 10-20-30 training increases performance and lowers blood pressure and VEGF in runners. Scand J Med Sci Sports 2014; 25:e479-89. [PMID: 25439558 DOI: 10.1111/sms.12356] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/03/2014] [Indexed: 12/27/2022]
Abstract
The present study examined the effect of training by the 10-20-30 concept on performance, blood pressure (BP), and skeletal muscle angiogenesis as well as the feasibility of completing high-intensity interval training in local running communities. One hundred sixty recreational runners were divided into either a control group (CON; n = 28), or a 10-20-30 training group (10-20-30; n = 132) replacing two of three weekly training sessions with 10-20-30 training for 8 weeks and performance of a 5-km run (5-K) and BP was measured. VO2max was measured and resting muscle biopsies were taken in a subgroup of runners (n = 18). 10-20-30 improved 5-K time (38 s) and lowered systolic BP (2 ± 1 mmHg). For hypertensive subjects in 10-20-30 (n = 30), systolic and diastolic BP was lowered by 5 ± 4 and 3 ± 2 mmHg, respectively, which was a greater reduction than in the non-hypertensive subjects (n = 102). 10-20-30 increased VO2max but did not influence muscle fiber area, distribution or capillarization, whereas the expression of the pro-angiogenic vascular endothelial growth factor (VEGF) was lowered by 22%. No changes were observed in CON. These results suggest that 10-20-30 training is an effective and easily implemented training intervention improving endurance performance, VO2max and lowering BP in recreational runners, but does not affect muscle morphology and reduces muscle VEGF.
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Affiliation(s)
- Lasse Gliemann
- Section of Integrated Physiology, Department of Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, Denmark
| | - Thomas P Gunnarsson
- Section of Integrated Physiology, Department of Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, Denmark
| | - Ylva Hellsten
- Section of Integrated Physiology, Department of Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, Denmark
| | - Jens Bangsbo
- Section of Integrated Physiology, Department of Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, Denmark
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Persson R, Garde AH, Hansen ÅM, Österberg K, Larsson B, Ørbæk P, Karlson B. Seasonal Variation in Human Salivary Cortisol Concentration. Chronobiol Int 2009; 25:923-37. [DOI: 10.1080/07420520802553648] [Citation(s) in RCA: 78] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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9
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Matchock RL, Dorn LD, Susman EJ. Diurnal and seasonal cortisol, testosterone, and DHEA rhythms in boys and girls during puberty. Chronobiol Int 2007; 24:969-90. [PMID: 17994350 DOI: 10.1080/07420520701649471] [Citation(s) in RCA: 110] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Diurnal and seasonal rhythms of cortisol, testosterone, and DHEA were examined, as little is known about the relationship between these rhythmicities and pubertal development. Salivary samples were obtained from 60 boys and 60 girls at approximately 07:45, 08:00, 08:30, 12:00, 16:50, and 21:00 h. The participants' ages ranged from 8-14 yrs, and each participant was tested three times at six-month intervals. The study was conducted at a General Clinical Research Center (GCRC) and at the homes of the participants. All hormones showed diurnal fluctuations. The acrophase (peak time) of cortisol occurred earlier than for testosterone or DHEA and showed a seasonal effect, with the acrophase occurring earlier in spring than in summer. The cortisol acrophase also occurred later in the day for boys than for girls during later puberty. Seasonal effects were found only for cortisol with higher concentrations in the spring and summer. Cortisol concentrations were relatively stable across pubertal maturation, but significantly lower concentrations were observed at pubertal stage 3 compared to the other stages. Morning cortisol levels were also higher in boys at pubertal stage 2. Testosterone concentrations were higher in boys at pubertal stages 3 and 4, and DHEA was lower at pubertal stage 1 than 3 and 4 for both boys and girls. For the total sample, there was a positive correlation between DHEA and testosterone during early puberty (stages 1-3) but not later puberty (stages 4-5). Awakening secretory activity correlated with daytime secretory activity for testosterone and DHEA, but not for cortisol. These data provide novel chronobiological information on cortisol, testosterone, and DHEA as it relates to sexual maturation and encourage further study on both normal and abnormal endocrine rhythms.
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Affiliation(s)
- Robert L Matchock
- Department of Psychology, The Pennsylvania State University, Altoona, Pennsylvania 16601, USA.
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Ferret J, Mathian B, Dupuis J, Martin G, de Peretti E, David M. Variations des taux d’androgènes et de cortisol au cours de six saisons chez des footballeurs professionnels. Sci Sports 2004. [DOI: 10.1016/j.scispo.2003.08.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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11
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Andersen S, Bruun NH, Pedersen KM, Laurberg P. Biologic variation is important for interpretation of thyroid function tests. Thyroid 2003; 13:1069-78. [PMID: 14651790 DOI: 10.1089/105072503770867237] [Citation(s) in RCA: 148] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Large variations exist in thyrotropin (TSH) and thyroid hormones in serum. The components of variation include preanalytical, analytical, and biologic variation. This is divided into between- and within-individual variation. The latter consists of circadian and seasonal differences although there are indicators of a genetically determined starting point. The ratio of within- to between-individual variation describes the reliability of population-based reference ranges. This ratio is low for serum TSH, thyroxine (T(4)) and triiodothyronine (T(3)) indicating that laboratory reference ranges are relatively insensitive to aberrations from normality in the individual. Solutions are considered but reducing the analytical variation below the calculated analytical goals of 7%, 5% and 12% for serum T(3), T(4), and TSH does not improve diagnostic performance. Neither does determination of the individual set-point and reference range. In practice this means that population-based reference ranges are necessary but that it is important to recognize their limitations for use in individuals. Serum TSH responds with amplification to minor alterations in T(4) and T(3). A consistently abnormal TSH probably indicates that T(4) and T(3) are not normal for the individual even when inside the laboratory reference range. This underlines the importance of TSH in diagnosis and monitoring of thyroid dysfunctions. Also, it implies that subclinical thyroid disease may be defined in purely biochemical terms. Under critical circumstances such as pregnancy where normal thyroid function is of importance for fetal brain development, subclinical thyroid disease should be treated. Even TSH within the reference range may be associated with slightly abnormal thyroid function of the individual. The clinical importance of such small abnormalities in thyroid function in small children and pregnant women for brain development remains to be elucidated.
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Affiliation(s)
- Stig Andersen
- Department of Endocrinology and Medicine, University Hospital Aalborg, Aalborg, Denmark.
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12
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Hoekstra Y, Weersink EJ, Postma DS, Kaufman HF. Seasonal variations in cyclic AMP production by peripheral blood mononuclear cells in allergic asthmatics. Clin Exp Allergy 1998; 28:271-7. [PMID: 9543075 DOI: 10.1046/j.1365-2222.1998.00208.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
BACKGROUND Dysfunction of the beta-adrenoceptor (betaAR)/adenylyl cyclase (AC) system can impair the response of different cell types, including lymphocytes. In asthma, impairment of this system as well as changes in cytokine production by lymphocytes have been described. Because the severity of asthma can change over the year, a circannual pattern of the betaAR/AC system activity may also exist. OBJECTIVES We set out to examine the activity of this betaAR/AC signal transduction system in peripheral blood mononuclear cells (PBMCs) of allergic asthmatics to asses whether differences existed between seasons. We investigated whether changes were associated with asthma severity and circannual changes in serum cortisol levels. METHODS During 19 months, 41 allergic asthmatics (mean age 28 years) with nocturnal airway obstruction were enrolled in the study. AC activity was measured by cyclic AMP production. Resting, stimulated and potentiated AC activities and their relationships with clinical parameters, seasonal influences and serum cortisol levels were assessed. RESULTS The AC activity in resting, stimulated and potentiated cells varied during the year. AC activity was relatively low in the periods June-August and September-November, and higher in December-February and March-May. Receptor-mediated and potentiated responses expressed as percentage of the resting response were equivalent throughout the year. Serum cortisol levels were positively related to AC activity. No relationships were found between clinical parameters and AC activity or serum cortisol levels. CONCLUSIONS These results indicate that AC activity in PBMCs of allergic asthmatics shows a seasonal variation. However, seasonal differences in AC activity seems to be unrelated with clinical parameters. Other factors such as serum cortisol levels may have a modulating influence on AC activity. Future studies of AC systems in blood cells of asthmatic patients need to take into account these seasonal influences.
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Affiliation(s)
- Y Hoekstra
- Department of Allergology, Clinic for Internal Medicine, University Hospital, Groningen, The Netherlands
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Kolopp M, Bicakova-Rocher A, Reinberg A, Drouin P, Méjean L, Lévi F, Debry G. Ultradian, circadian and circannual rhythms of blood glucose and injected insulins documented in six self-controlled adult diabetics. Chronobiol Int 1986; 3:265-80. [PMID: 3315255 DOI: 10.3109/07420528609079544] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The aim of the study was to document during one to two years individual rhythmic patterns in blood glucose and injected insulin in self-controlled insulin dependent (C-peptide negative) diabetics with home blood glucose monitoring. Two females and four males with diurnal activity from 0700 to 2300 self-determined their blood glucose three to six times a day over a period of 12-27 months. Circadian and ultradian rhythms were analysed for each subject on a monthly basis to document annual rhythms. Blood glucose (BG) estimated circadian acrophases were located between 2200 and 0300 for all patients and months with few exceptions. A correlation was found between circadian mesors and amplitudes of BG in four subjects. Annual changes in BG were validated for each subject with large interindividual differences in peak times. The individual mean of injected insulin (II) varied from 40 to 80 iU with annual changes validated for each subject. A group pattern was observed with a peak time either in the autumn (four patients) or in the summer (two patients). A circadian rhythm of II was detected in almost all monthly means and for all patients. Locations of computed peak time phi of II exhibited a great stability for a given individual but large interindividual differences. Thus the rather constant phi location of BG for all subjects contrasted with interindividual differences in phi locations of II. These results suggest that rhythmic changes in BG and II should be recognized when forming a realistic strategy for timing and dosing time(s) of insulin.
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Affiliation(s)
- M Kolopp
- Hôpital Jeanne d'Arc, Toul, France
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