Relation Between Lean Body Mass and Thyroid Volume in Competition Rowers Before and During Intensive Physical Training

Wesche, M. F. T.; Wiersinga, W. M.

doi:10.1055/s-2001-16232

Cited by 16 publications

(15 citation statements)

References 17 publications

(22 reference statements)

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“…Some authors reported no exercise induced effects on serum 435 TSH in trained athletes and sedentary individuals [42,43] whereas 436 other suggested a basal [41], or acute decrease of TSH concentra-437 tion after long term exercise [44,45] and resistance training [46] 438 similar to our results (Fig. 6B).…”

supporting

confidence: 92%

“…38 Satellite cells are the basis for skeletal muscle recovery and 39 regeneration following injury caused by trauma or unfamiliar 40 exercise. In a rat model Schmalenbruch and Lewis could 41 demonstrate that unloaded adult muscle has a relatively slow 42 nuclei turnover of 1-2% compared to young muscle [9]. This is 43 known to change dramatically in response to injury.…”

Section: Introductionmentioning

confidence: 95%

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Combined effects of androgen anabolic steroids and physical activity on the hypothalamic–pituitary–gonadal axis

Hengevoß

Marion

Müller

et al. 2015

The Journal of Steroid Biochemistry and Molecular Biology

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supporting

confidence: 92%

Section: Introductionmentioning

confidence: 95%

Combined effects of androgen anabolic steroids and physical activity on the hypothalamic–pituitary–gonadal axis

Hengevoß

Marion

Müller

et al. 2015

The Journal of Steroid Biochemistry and Molecular Biology

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“…Most studies have demonstrated clinically and biologically insignificant high thyroid-stimulating hormone (TSH), low tri-iodothyronine (T3), low thyroxin (T4), and increased thyroid volume in the obese population [1][2][3] . There are few reports about the relationship between weight loss and thyroid volume and function [4][5][6][7] . In a recent study, we reported higher goiter prevalence and increased thyroid volume in obese women and a reduction in thyroid volume after 1 10% weight loss in obese women [6] .…”

Section: Introductionmentioning

confidence: 99%

Relationship between Thyroid Volume and Iodine, Leptin, and Adiponectin in Obese Women before and after Weight Loss

Eray

Sarı²,

Özdem

et al. 2010

Med Princ Pract

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Objective: To investigate whether or not reduction of thyroid volume during weight loss is related to adipocytokines and urinary iodine excretion in obese women. Subjects and Methods: 98 obese and 31 non-obese women consecutively admitted to the endocrinology and metabolism outpatient clinic of the School of Medicine, Akdeniz University were included in the study. Thyroid volume, thyroid function tests, leptin and adiponectin levels, and urinary iodine excretion were measured at baseline and six months after treatment for obesity. Results: Thyroid volume increased in obese women (p = 0.048). After adjustment for body mass index, there were no significant differences in plasma leptin and serum adiponectin levels between obese and non-obese women (p > 0.05). Thyroid volume correlated positively with body mass index (r = 0.48, p = 0.04), leptin (r = 0.1, p = 0.03), and thyroid-stimulating hormone (r = 0.43, p = 0.001) levels, while there was a negative correlation between thyroid volume and urinary iodine (r = –0.38, p = 0.04) and urinary iodine/creatinine ratio (r = –0.25, p = 0.045) in obese women. Changes in body mass index (p = 0.022) and leptin levels (p = 0.039) were the only factors that significantly affected the change of thyroid volume during weight loss. Conclusion: Iodine status may play an important role in increased thyroid volume in obese women; however, iodine status did not seem to exert a significant influence on the changes in thyroid volume. On the other hand, changes in both body mass index and plasma leptin levels seemed to be important for changes in thyroid volume.

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“…Some authors reported no major effect of exercise training on serum TSH levels in professional athletes (1) and sedentary individuals (2) suggesting that the influence of chronic exercise is likely to be small; in contrast other authors suggested long-term exercise training may lead to downregulation of thyroid hormone concentrations (3)(4)(5). Among the candidate factors, this response may be induced by the exerciseinduced negative energy balance as well as signaling alterations in the hypothalamus-pituitary-thyroid and hypothalamus-adipocyte-leptin axes (5).…”

Section: Introductionmentioning

confidence: 99%

Free leptin index and thyroid function in male highly trained athletes

Perseghin

Lattuada

Ragogna

et al. 2009

European Journal of Endocrinology

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Objective: Exercise training may cause changes in thyroid function. This thyroid response may be due to exercise-induced modulation of energy metabolism but also of the adipocytes endocrine function. In particular, the role of leptin and of circulating soluble leptin receptor (sOB-R) was unexplored. The aim of this study was to assess the relationships between thyroid function, whole body energy metabolism, and adipokines -mainly leptin and its receptor, sOB-R. Methods: We measured serum TSH, free tri-iodothyronine (FT 3 ), free thyroxine, leptin, and sOB-R and assessed energy homeostasis by means of indirect calorimetry, in 27 highly trained athletes and 27 sedentary, healthy men. Results: TSH-FT 3 ratio was lower in athletes (P!0.03), either in sustained power or anaerobic powersprint athletes (nZ13) or marathon runners (nZ14). Whole body respiratory quotient was lower in athletes. Fasting serum sOB-R was higher and leptin lower in athletes than controls. Also serum adiponectin, resistin, and retinol binding protein-4 concentrations were different in athletes than in controls. The ratio between leptin and sOB-R, the free leptin index (FLI), was lower in athletes than in controls (0.025G0.014 vs 0.085G0.049; P!0.001). In multivariate analysis, FLI retained independent association with TSH-FT 3 ratio. Conclusion: Male, elite athletes had lower TSH-FT 3 ratio and FLI than controls while FLI was independently associated with TSH-FT 3 ratio supporting the hypothesis that the level of biologically active leptin is involved in the adaptive response of thyroid function in professional athletes.

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Relation Between Lean Body Mass and Thyroid Volume in Competition Rowers Before and During Intensive Physical Training

Abstract: After a six-month period of intensive physical training, changes in thyroid volume correlate directly with changes in body composition.

Cited by 16 publications

References 17 publications

Combined effects of androgen anabolic steroids and physical activity on the hypothalamic–pituitary–gonadal axis

Combined effects of androgen anabolic steroids and physical activity on the hypothalamic–pituitary–gonadal axis

Relationship between Thyroid Volume and Iodine, Leptin, and Adiponectin in Obese Women before and after Weight Loss

Free leptin index and thyroid function in male highly trained athletes

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