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Altas A, Kuzu F, Arpaci D, Unal M, Can M, Barut F, Kokturk F, Ilikhan SU, Bayraktaroglu T. The Clinical Values of Insulin-Like Growth Factor-1 and Insulin-Like Growth Factor Binding Protein-3 Levels in Blood and Thyroid Nodules. Int J Endocrinol 2017; 2017:3145234. [PMID: 29081797 PMCID: PMC5610865 DOI: 10.1155/2017/3145234] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/02/2017] [Accepted: 08/10/2017] [Indexed: 11/18/2022] Open
Abstract
AIM Insulin-like growth factor-1 (IGF-1) is a potent mitogen for many cells. IGF-1 plays a role in the pathogenesis of various tumors with its mutagenic and antiapoptotic properties. The aim of this study was to determine both the serum and intranodular levels of IGF-1 and insulin-like growth factor binding protein-3 (IGFBP-3) in patients with nodular thyroid diseases. MATERIALS AND METHODS In this study, 80 subjects who performed fine-needle aspiration biopsy (FNAB) were required in order to investigate the effects of serum and intranodular IGF-1 and IGFBP-3 in the pathogenesis of nodules. After performing FNAB, IGF-1 and IGFBP-3 levels were determined in blood and aspiration samples. RESULTS The serum levels of IGF-1 (232.8 ± 12.9 ng/ml) and IGFBP-3 (4.8 μg/ml) were found significantly higher than that of the intranodular IGF-1 (39.1 ng/ml) and intranodular IGFBP-3 levels (0.173 μg/ml) (p < 0.01). Intranodular levels of IGF-1 and IGFBP-3 were higher in subjects with multinodular thyroid gland than those of subjects with solitary nodules (p = 0.043). A positive correlation between the nodule size and the serum IGFBP-3 levels was detected (p = 0.042, r = 0.23). CONCLUSION This study demonstrated the possible role of both IGF-1 and IGFBP-3 in the growth and the formation of multinodularity of thyroid nodules.
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Affiliation(s)
- Ayfer Altas
- Department of Internal Medicine, Faculty of Medicine, Bulent Ecevit University, Zonguldak, Turkey
| | - Fatih Kuzu
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Faculty of Medicine, Bulent Ecevit University, Zonguldak, Turkey
| | - Dilek Arpaci
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Faculty of Medicine, Bulent Ecevit University, Zonguldak, Turkey
| | - Mustafa Unal
- Department of Internal Medicine, Faculty of Medicine, Bulent Ecevit University, Zonguldak, Turkey
| | - Murat Can
- Department of Biochemistry, Faculty of Medicine, Bulent Ecevit University, Zonguldak, Turkey
| | - Figen Barut
- Department of Pathology, Faculty of Medicine, Bulent Ecevit University, Zonguldak, Turkey
| | - Furuzan Kokturk
- Department of Biostatistics, Faculty of Medicine, Bulent Ecevit University, Zonguldak, Turkey
| | - Sevil Uygun Ilikhan
- Department of Internal Medicine, Faculty of Medicine, Bulent Ecevit University, Zonguldak, Turkey
| | - Taner Bayraktaroglu
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Faculty of Medicine, Bulent Ecevit University, Zonguldak, Turkey
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Nery F, Guttierres APM, Dias MRC. Nível de desidratação após treinamento de ciclismo indoor. REV BRAS MED ESPORTE 2014. [DOI: 10.1590/1517-86922014200402051] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
INTRODUÇÃO: A desidratação no ciclismo indoor é um tema pouco estudado na literatura.OBJETIVO: Verificar o nível de desidratação dos praticantes de ciclismo indoorapós a atividade, assim como a presença de proteínas na urina.MÉTODOS: Foram recrutados 30 homens (25,5 ± 3,9 anos), praticantes de ciclismo indoor,que realizaram um treinamento de 50 minutos de ciclismo indoor de característica intermitente: a) 5 minutos de aquecimento sem carga e com alta velocidade; b) 40 minutos de treinamento intermitente (alternando seis ciclos intensos de 5 minutos e cinco ciclos leves de 3 minutos); c) cinco minutos de volta à calma sem carga e com regressão da velocidade. Para a verificação do estado de hidratação, foram avaliados: massa corporal, desidratação relativa e absoluta, grau de desidratação, taxa de sudorese e densidade da urina. A intensidade do treino foi verificada por meio da frequência cardíaca e percepção subjetiva de esforço.RESULTADOS: A perda de massa corporal após o treinamento foi significativa (0,523 ± 0,362 kg) e correspondeu a um percentual de desidratação de 0,69 ± 0,47%. Nenhum sujeito apresentou nível elevado de desidratação. Com relação à perda proteica na urina, 83,3% dos sujeitos apresentaram baixo nível de proteínas na urina, enquanto 16,7% apresentaram níveis moderados.CONCLUSÃO: A desidratação e a perda de proteínas na urina apresentaram baixos níveis após o treinamento de ciclismo indoor.
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Yesil EE, Paker N, Yesil A, Kayatas K, Laleli Y, Ari E. Urinary gamma-glutamyl transferase-to-creatinine ratio as an indicator of tubular function in Bence Jones Proteinuria. Ren Fail 2014; 36:390-2. [DOI: 10.3109/0886022x.2013.867784] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Protano C, Andreoli R, Manini P, Vitali M. Urinary trans, trans-muconic acid and S-phenylmercapturic acid are indicative of exposure to urban benzene pollution during childhood. THE SCIENCE OF THE TOTAL ENVIRONMENT 2012; 435-436:115-123. [PMID: 22846771 DOI: 10.1016/j.scitotenv.2012.07.004] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2012] [Revised: 07/02/2012] [Accepted: 07/02/2012] [Indexed: 06/01/2023]
Abstract
The aims of the study were to evaluate the feasibility of urinary trans, trans-muconic acid (u-t,t-MA) and urinary S-phenylmercapturic acid (u-SPMA) as markers of exposure to urban benzene pollution for biomonitoring studies performed on children and to investigate the impact that creatinine correction may have on the classification of children exposure status. U-t,t-MA, u-SPMA, u-cotinine, and u-creatinine levels were measured in urine samples of 396 Italian children (5-11 years) living in three areas with different degrees of urbanisation (very, fairly and non-urban). The median u-SPMA levels significantly increased with increased urbanisation: non-urban (0.19 μg/L; 0.22 μg/g creatinine)<fairly urban (0.28 μg/L; 0.28 μg/g creatinine)<very urban group (0.92 μg/L; 0.90 μg/g creatinine). Differences in the levels of u-t,t-MA excretion related to the degree of urbanisation were revealed only by multivariate analyses. Neither u-SPMA nor u-t,t-MA levels were influenced by environmental tobacco smoke (ETS) exposure. Athletic activity during the sampling day was negatively associated with u-SPMA in the model built with u-SPMA adjusted for creatinine, but not in the model where unadjusted u-SPMA was used. This finding demonstrates that u-creatinine correction may alter the results when an independent variable is unrelated to the chemical concentration itself but is related to the u-creatinine levels. These results suggest that both u-SPMA and u-t,t-MA are indicative for assessing environmental benzene exposure in children (exposed and unexposed to ETS) when urine sample is collected at the end of the day. However, u-SPMA is more reliable because u-t,t-MA, also a metabolite of sorbic acid, is less specific for exposure to low levels of benzene. To avoid the possible confounding effect of creatinine correction, it is better to use u-creatinine as additional independent variable in multiple linear regression analyses for evaluating the independent role of the covariates on the variability of u-t,t-MA and u-SPMA levels.
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Affiliation(s)
- Carmela Protano
- Department of Public Health and Infectious Diseases, P.le Aldo Moro 5, 00185, Sapienza University, Rome, Italy.
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Shavandi N, Samiei A, Afshar R, Saremi A, Sheikhhoseini R. The effect of exercise on urinary gamma-glutamyltransferase and protein levels in elite female karate athletes. Asian J Sports Med 2012; 3:41-6. [PMID: 22461964 PMCID: PMC3307965 DOI: 10.5812/asjsm.34724] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/24/2011] [Accepted: 09/22/2011] [Indexed: 11/16/2022] Open
Abstract
PURPOSE Post exercise proteinuria and increased urinary Gamma-Glutamyl transferase (GGT) levels can be indicative of exercise-induced renal damage. The aim of this investigation is to study the effect of one session of intensive training on renal damage markers and compare their values to those 6 hours after training. METHODS In this cross-sectional study with pre- and post-test design, 10 elite volunteer female athletes were selected and participated in one training session (2 hours). Urine samples were collected before training, one hour after training, and 6 hours after training. Urinary protein (Pr), creatinine (Cr), and GGT values were measured through laboratory methods and then Pr/Cr and GGT/Cr ratios were computed. RESULTS There were significant differences between values of protein, GGT and Creatinine in the three sampling phases (P<0.05). However, no significant differences were observed between values for GGT/Cr and Pr/Cr ratio. There were significant differences between the mean values of Creatinine, protein and GGT within pre-exercise and 1 hour post-exercise and within 1 hour post-exercise and 6 hours post-exercise (P<0.05). CONCLUSION It seems that a session of karate training does not result in renal damage and athletes can continue training after 6 hours.
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Affiliation(s)
- Nader Shavandi
- Department of Sports Physiology, Arak University, Arak, Iran
| | - Abolfazl Samiei
- Department of Sports Physiology, Arak University, Arak, Iran
- Corresponding Author: Address: Physical Education and Sport Sciences Department, Humanity Faculty, Arak University, Shariati Sq, Arak, Iran. E-mail:
| | - Reza Afshar
- Department of Nephrology, Shahed University, Tehran, Iran
| | - Abbas Saremi
- Department of Sports Physiology, Arak University, Arak, Iran
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Gatti R, De Palo EF, Antonelli G, Spinella P. IGF-I/IGFBP system: metabolism outline and physical exercise. J Endocrinol Invest 2012; 35:699-707. [PMID: 22714057 DOI: 10.3275/8456] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The GH/IGF-I system plays a well-known hormonal role and its effects, mainly anabolic and insulin-sensitizing, are mediated through endocrine as well as paracrine/ autocrine mechanisms. This system includes the binding proteins, namely GH binding proteins and IGF-I binding proteins (IGFBP). As expected, this axis plays a key role in organism modification in consequence of a physical exercise. Physical activity, training, and exercise capacity chiefly involve anabolism process modifications of various tissues, in particular muscular adjustments. Numerous investigators found a correlation among the level of exercise tolerance, muscle strength or walking speed and IGF-I/IGFBP-3 concentrations. However, also inverse and absent correlations between circulating IGF-I concentrations and acute or chronic exercise responses have been reported. IGF-I is generally accepted as an important GH mediator with metabolic effects, through both endocrine and paracrine or autocrine mechanisms. GH is the main regulator of the hepatic synthesis of IGF-I and IGFBP-3, which is the most abundant IGF carrier in human plasma. Recently, it has been shown that the physical exercise stimulatory impact on skeletal muscles is mediated through an increased local IGF-I synthesis with an IGFPB involvement. An absent association of exercise performance and circulating IGF-I may indicate that exercise will exert muscle strength by predominately locally derived paracrine or autocrine mediators rather than endocrine circulating IGF-I. The present review considers the general aspects of the IGF/IGFPB system and the role of the IGF/IGFPB system in relation to physical exercise (type, duration, etc.) taking into account the training aspects.
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Affiliation(s)
- R Gatti
- Clinical Biochemistry, Department of Medical Diagnostic Sciences and Special Therapies, University of Padua, Padua, Italy
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Hasani-Ranjbar S, Soleymani Far E, Heshmat R, Rajabi H, Kosari H. Time course responses of serum GH, insulin, IGF-1, IGFBP1, and IGFBP3 concentrations after heavy resistance exercise in trained and untrained men. Endocrine 2012; 41:144-51. [PMID: 21983797 DOI: 10.1007/s12020-011-9537-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/14/2011] [Accepted: 08/24/2011] [Indexed: 10/17/2022]
Abstract
To investigate the effect of heavy resistance exercise on IGF-1 system, 19 healthy trained men and 15 healthy untrained men volunteered to participate in this study. The subjects were randomly divided into experimental and control groups. Subjects of experimental groups were forced to perform a heavy resistance exercise with the intensity of 70-80% of 1RM in selected movements. The blood samples were taken from all subjects four times; before (T1), immediately after (T2), 5 (T3), and 8 (T4) hours after exercise. Analysis of data showed that a session of heavy resistance exercise induced significant increase in GH at T2 (P < 0.05) and a significant decrease in insulin at T4 (P < 0.05) and a significant decrease in IGFBP3 at T4 (P < 0.05) in trained group. In untrained group, no significant change in any of the variables was observed. However, the procedure of response in variables was almost similar in two experimental groups. Although, the exercise did not appreciably affect IGF-1 levels, it decreased in all groups at length of time after exercise. In addition, the exercise did not have any notable effect on IGFBP1 levels over time. In conclusion, the findings of this study indicate that the intense resistance exercise can lead to changes in blood concentrations of IGF-1 system components which are observable in blood circulation over time and the amounts of changes depend on subjects' fitness levels and exercise variables.
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Affiliation(s)
- Shirin Hasani-Ranjbar
- Endocrinology & Metabolism Research Institute, Tehran University of Medical Sciences, 5th Floor, Shariati Hospital, North Kargar Ave., 14114, Tehran, Iran.
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Turgut S, Erken HA, Erken G, Ayada C, Genc O, Turgut G. The effects of docosahexaenoic acid supplementation and exercise on growth hormone and insulin-like growth factor I serum levels during chronic hypoxia in rats. J Basic Clin Physiol Pharmacol 2011; 22:103-107. [PMID: 22865430 DOI: 10.1515/jbcpp.2011.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2011] [Accepted: 09/02/2011] [Indexed: 06/01/2023]
Abstract
BACKGROUND In this study we examined the effects of docosahexaenoic acid (DHA) on growth hormone (GH), insulin-like growth factor I (IGF-I) and insulin-like growth factor binding protein-3 (IGFBP-3) in response to chronic hypoxia and exercise training in hypoxic conditions. METHODS Thirty-five rats were divided into five groups; control group (C), hypoxia group (H), hypoxia-exercise group (HE), hypoxia-docosahexaenoic acid group (HD), hypoxia-exercise-docosahexaenoic acid group (HED). A treadmill exercise was performed as 30 m/min for 20 min/day, 5 days per week for 28 days at level grade for the exercising groups (HE and HED). DHA was given to the HD and HED groups every day orally (36 mg/kg). The animals, except for the C group, were exposed to hypoxia for 28 days. RESULTS Serum levels of GH and IGF-I in the H group decreased after chronic hypoxia (p<0.001). GH and IGF-I in the HD group also decreased compared with the C group (p<0.05, p<0.01, respectively). GH in C group did not show significant difference compared with the HE and HED groups. Decreased serum level of IGF-I was observed for the HED group (p<0.05). CONCLUSIONS According to our findings, chronic hypoxia exposure decreases serum levels of GH, and IGF-I and exercise training have a slightly positive effect on GH/IGF-I axis during hypoxia. In addition, DHA supplementation slightly increases GH and IGF-I serum levels in hypoxic conditions. However, this effect on GH/IGF-I axis during hypoxia is not strong compared with exercise. Therefore, we concluded that exercise and/or DHA supplementation does not have additional positive effect on these hormones in hypoxic conditions.
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Affiliation(s)
- Sebahat Turgut
- Department of Physiology, University of Pamukkale, Denizli, Turkey.
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Field T. Exercise research on children and adolescents. Complement Ther Clin Pract 2011; 18:54-9. [PMID: 22196575 DOI: 10.1016/j.ctcp.2011.04.002] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2010] [Accepted: 04/04/2011] [Indexed: 10/18/2022]
Abstract
This paper is a review of studies published during the last several years on exercise effects on overweight, growth, chronic illnesses, depression and anxiety in children and adolescents. Although the lion's share of the research involves aerobic exercise, studies on yoga and tai chi are also reviewed. Following exercise, body mass index and lipid profiles have improved in overweight children, and those with asthma, diabetes and depression have also benefited from exercise. The yoga studies reviewed here focused on ADHD and anxiety, and the tai chi studies involved children with ADHD and asthma. A potential underlying mechanism for the positive effects of exercise, yoga and tai chi may be the stimulation of pressure receptors leading to increased vagal activity, decreased stress hormones and increased production of anti-pain and antidepressant neurotransmitters such as serotonin. Further studies are needed using convergent behavioral, physiological and biochemical measures. Nonetheless, the current literature highlights the importance of adding exercise programs to clinics, schools and families for the physical and psychological well-being of children and adolescents.
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Affiliation(s)
- Tiffany Field
- Touch Research Institute, University of Miami Medical School, PO Box 016820 Miami, FL 33101, USA.
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Tian Y, Tong TK, Lippi G, Huang C, Shi Q, Nie J. Renal function parameters during early and late recovery periods following an all-out 21-km run in trained adolescent runners. Clin Chem Lab Med 2011; 49:993-7. [DOI: 10.1515/cclm.2011.172] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Kursunluoglu R, Turgut S, Akin F, Bastemir M, Kaptanoglu B, Genc O, Turgut G. Insulin-like growth factor-I gene and insulin-like growth factor binding protein-3 polymorphism in patients with thyroid dysfunction. Arch Med Res 2009; 40:42-7. [PMID: 19064126 DOI: 10.1016/j.arcmed.2008.10.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2008] [Accepted: 09/22/2008] [Indexed: 10/21/2022]
Abstract
BACKGROUND AND AIMS Thyroid hormones have important roles in normal growth and skeletal muscle development. IGF-I is one of the most important growth factors and is needed for the proliferation and development of thyroid cells. It stimulates fibroblasts, follicular and endothelia cells in thyroid gland. It has been shown that thyroid hormones play an important role in the regulation of IGF-I and IGFBP-3. In this study we proposed that IGF-I (CA)(19) and IGFBP-3-202 A/C gene polymorphism may affect thyroid functions. For this purpose, frequency of IGF-I (CA)(19) and IGFBP-3-202 A/C gene polymorphism in hypo- and hyperthyroid patients and possible role of these polymorphism in thyroid functions were investigated. METHODS This study was performed on 37 volunteer hyperthyroid and 76 hypothyroid patients as well as with 50 healthy subjects as controls. DNA isolation was applied in peripheral blood samples obtained from patients and controls. Required areas were amplified with PCR by using proper primers belonging to these gene areas from the isolated DNA samples. The products were evaluated with visualization by UV gel documentation system. RESULTS Frequency of IGF-I (CA)(19) gene polymorphism among hypothyroidism patients, hyperthyroidism patients and controls were statistically significant (chi(2) = 11.55, df = 4, p = 0.021). Genotypic variations between hyper- and hypothyroid patients were significant (chi(2) = 11.39, df = 2, p = 0.003), whereas there was no difference in IGF-I (CA)(19) gene polymorphism between the patients and controls. Differences in the IGFBP-3-202 A/C gene polymorphism between controls and hypo- as well as hyperthyroid patients were not significant. But IGFBP-3-202 A/C gene polymorphism genotype frequencies showed a significant difference between hypo- and hyperthyroid patients (chi(2) = 6.24, df = 2, p = 0.044). CONCLUSIONS These findings suggests that IGF-I (CA)(19) and IGFBP-3-202 A/C gene polymorphisms may be a risk factor for hypothyroidism.
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Franco FS, Natali AJ, Costa NM, Lunz W, Gomes GJ, Carneiro Junior MA, Oliveira TT. Efeitos da suplementação de creatina e do treinamento de potência sobre a performance e a massa corporal magra de ratos. REV BRAS MED ESPORTE 2007. [DOI: 10.1590/s1517-86922007000500004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
INTRODUÇÃO: A creatina é um dos suplementos mais usados por atletas para incrementar a síntese protéica e aumentar a massa e força muscular. OBJETIVO: Investigou-se os efeitos da suplementação de creatina associada a um programa de treinamento de potência (saltos verticais) sobre a performance e a composição da massa corporal magra de ratos Wistar. MÉTODOS: Ratos Wistar adultos foram distribuídos em quatro grupos: SSC (sedentário sem creatina); SC (sedentário com creatina); ESC (exercício sem creatina) e EC (exercício com creatina). Os animais receberam água e ração ad libitum. Os grupos SC e EC ingeriam dose de creatina diariamente, adotando o procedimento de carga (0,430g/kg p.c. por 7 dias) e manutenção (0,070g/kg p.c. por 6 semanas). Os grupos EC e ESC foram submetidos a um regime progressivo de saltos verticais (5x10 saltos com 1 min de intervalo) em tanque com água, 5 dias/semana, durante 7 semanas. A performance foi avaliada pelo tempo de execução das 5 séries de 10 saltos verticais e a composição da massa corporal magra (músculos e ossos) foi avaliada pelas porções: água, proteína e gordura. RESULTADOS: A performance não foi afetada pela ingestão de creatina (p > 0,05). Os animais suplementados tiveram o percentual de proteína elevado e o de gordura reduzido (p < 0,05), independente do treinamento. Os animais exercitados exibiram maior percentual de proteína, e menor de gordura, além de menor ganho de peso corporal, comparados com os sedentários, independente da suplementação (p < 0,05). Não houve diferença para o percentual de água e consumo alimentar (p > 0,05). CONCLUSÃO: A suplementação de creatina não afetou a performance dos animais, mas alterou a massa corporal magra. A suplementação de creatina e o programa de treinamento de potência, de forma independente, elevaram o percentual de proteína dos músculos e ossos e reduziram o percentual de gordura, sem alterar o percentual de água.
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Turgut S, Kaptanoğlu B, Emmungil G, Turgut G. Increased Plasma Levels of Growth Hormone, Insulin-Like Growth Factor (IGF)-I and IGF-Binding Protein 3 in Pregnant Rats with Exercise. TOHOKU J EXP MED 2006; 208:75-81. [PMID: 16340176 DOI: 10.1620/tjem.208.75] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Growth hormone (GH) and insulin-like growth factor-I (IGF-I) are closely related molecules. Insulin-like growth factor-binding protein-3 (IGFBP-3) is a main molecule that binds IGF-I. GH, IGF-I and IGFBP-3 have important roles in growth and development. In this study, we investigated the effects of exercise during pregnancy on maternal plasma levels of GH, IGF-I and IGFBP-3 and on fetal development. We also recorded the weights of placenta, lengths of umbilical cord, fetal body weights, fetal heights, and weights of fetal tissues. Pregnant Wistar Albino rats were divided into two groups: exercise and control groups (n = 7 for each). A treadmill exercise was performed as 20 m/min for 20 min/day, once per day for 19 days in exercise group. Blood samples were collected from pregnant rats on 0, 7th, 14th and 20th days of gestation (D) under anesthesia with intracardiac puncture, and maternal plasma levels of GH, IGF-I and IGFBP-3 were determined. Fetuses were taken with cesarean section on D20, and various parameters for fetal growth were measured. Plasma GH and IGF-I levels were elevated in exercising pregnant rats on D14 and D20, respectively, when compared to controls, and IGFBP-3 levels were increased on D14 and D20. Among the growth parameters examined, only fetal body weights and weights of fetal liver were significantly decreased in the exercise group (p < 0.01 and p < 0.05, respectively). These results indicate that maternal exercise significantly increases plasma levels of GH, IGF-I and IGFBP-3 in the late period of pregnancy but causes adverse effects on fetal growth.
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Affiliation(s)
- Sebahat Turgut
- Department of Physiology, Faculty of Medicine, Pamukkale University, Denizli, Turkey.
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Mejri S, Bchir F, Ben Rayana MC, Ben Hamida J, Ben Slama C. Effect of training on GH and IGF-1 responses to a submaximal exercise in football players. Eur J Appl Physiol 2005; 95:496-503. [PMID: 16151829 DOI: 10.1007/s00421-005-0007-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/01/2005] [Indexed: 10/25/2022]
Abstract
To study the effects of regular football training on basal and exercise induced levels of growth hormone (GH) and insulin-like growth factor (IGF-1), 13 young football players were investigated by a submaximal exercise at the beginning of the sporting season in October (S1), at the middle of the season in January (S2) and at the end in May (S3). At each session, an exercise test on an ergogycle was performed for 25 min, beginning with an incremental exercise to reach 90% of theoretical maximal heart, which was maintained for the last 10 min of the test. Venous blood samples were collected at rest, at the end of the exercise and at 30 and 60 min during the recovery period. Plasma lactate and glucose concentrations increased during exercise with no difference found between sessions. GH level increased with exercise at each session but the response was significantly higher in S1 than in S2 and S3 (P<0.01). The GH area under the curve decreased significantly all along the football season (P<0.01); the IGF-1 level did not significantly change during exercise nor with training. Basal insulin-like growth factor binding protein-3 (IGFBP3) remained stable during the three sessions. Football training decreased significantly the exercise-stimulated GH levels all along the football season but did not have any significant effect on IGF-1 levels or on basal IGFBP3 levels.
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Affiliation(s)
- S Mejri
- Service d'Endocrinologie et Métabolisme, Institut National de Nutrition, 11, Rue Djebel-Lakhdar-Bab Saâdoun, 1007, Tunis, Tunisie
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Kageyama K, Moriyama T, Sakihara S, Takayasu S, Nigawara T, Suda T. Usefulness of the Thyrotropin-Releasing Hormone Test in Pre-Clinical Acromegaly. TOHOKU J EXP MED 2005; 206:291-7. [PMID: 15997199 DOI: 10.1620/tjem.206.291] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Acromegaly is caused primarily by pituitary growth hormone (GH)-secreting tumors. It is usually recognized because of characteristic manifestations, and diagnosed clinically. However, there exists a mild stage of acromegaly, which poses a diagnostic problem due to the absence of typical clinical manifestations. Here we present four patients with pre-clinical acromegaly, who showed minimal acromegaloid features with elevated levels of insulin-like growth factor-I. Basal GH levels were within normal levels in 3 of 4 cases, while insulin-like growth factor-I levels were elevated above normal in all cases. Plasma GH levels were elevated in response to thyrotropin-releasing hormone (TRH) in all cases, indicating a diagnostic value of the TRH stimulation test. In contrast, an oral glucose tolerance test was not useful for the diagnosis, because of the low GH levels (less than 1 ng/ml) and/or secondary to diabetes mellitus. In response to a dopamine agonist, GH levels were increased in the two cases, whereas GH levels were decreased or remained unchanged in the other two cases. We therefore suggest that the TRH stimulation test would be helpful to examine the presence of pre-clinical acromegaly. Diagnosis of the early stages of acromegaly is important to prevent progression to overt acromegaly.
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Affiliation(s)
- Kazunori Kageyama
- Department of Endocrinology, Metabolism and Infectious Diseases, Hirosaki University School of Medicine, 5 Zaifu-cho, Hirosaki, Japan.
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