Plasma Hormones and Physical Exercise

Viru, Atko

doi:10.1055/s-2007-1021254

Cited by 125 publications

(94 citation statements)

References 34 publications

(62 reference statements)

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“…Physical stress as a consequence of the training loads triggers a number of physiological changes such as activation of the sympathetic nervous system and the hypothalamic -pituitary -adrenal axis [5,24]. The testosterone to cortisol (T/C) ratio has been suggested as simplified marker for assessing the balance between anabolic and catabolic processes [17].…”

Section: Introductionmentioning

confidence: 99%

Stress and muscle damage monitoring in high-level basketball players

Gocentas

Landõr

2012

PoA

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Close complex monitoring during the entire training period is essential for professional athletes to assess the effect of the training programme and to determine the quality of recovery. Follow-up of biochemical and hormonal variables throughout the season can help realize the abovementioned goals.Objectives: To determine baseline blood creatine kinase (CK) and cortisol (C) levels in professional basketball players before the beginning of regular training and to follow up the subsequent levels of blood C and CK over an entire season with analysis of dynamic changes in relation to individual coefficients of variation.Methods: Six professional basketball players were monitored from the first pre-season day to the end of a regular season. Blood samples were collected at six time points: before the pre-season, after the pre-season and four times during the in-season to determine blood C and CK concentrations.Results: Individual trends of the investigated variables were established and analysed with respect to the calculated intra-and inter-individual coefficients of variation for C and CK. Dynamic changes in C and CK levels coincided with changes in the content of the training process.Conclusion: In summary, the findings in the present study suggest that long-term intensive exercise in basketball has a significant influence on the blood cortisol profile. Muscle damage was associated with bodily collisions between the players but not with stress response in the current study.

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Section: Introductionmentioning

confidence: 99%

Stress and muscle damage monitoring in high-level basketball players

Gocentas

Landõr

2012

PoA

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“…For example, Viru and cols. showed that exercise induces increased cortisol responses in adolescents and young adults (2,11,12). These investigators also found a lowering of cortisol levels at rest and with exercise as adolescents move from Tanner Stage 2 to Stage 5 (12).…”

Section: Discussionmentioning

confidence: 77%

Comparison of the hormonal responses to exhaustive incremental exercise in adolescent and young adult males

Hackney¹,

Viru

VanBruggen³

et al. 2011

Arq Bras Endocrinol Metab

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Objective: Evaluate hormonal responses to incremental-stage exercise (EX) test to exhaustion in adolescents. Subjects and methods: Adolescents were tested at 16 years of age in Tanner Stage 4 (TS4) and at 17 years of age in Tanner Stage 5 (TS5) (n = 6). Adults were tested at 21 ± 1 y. (X ± SD) (n = 4) and served as controls. Blood samples were taken at rest, at the end of each EX stage. Results: Main effects for EX in cortisol (p < 0.01, increasing with each EX stage) and for subject group for testosterone (T) occurred (p < 0.01; TS4 < TS5, adults). Interaction effect of group by EX stage occurred for GH (p < 0.05). GH increased in response to EX in all groups, however, the magnitude of increase was significantly less for TS5 and adults than TS4. Conclusions: Differences in T and GH responses for TS4 than those for TS5 and adults reflect the differing maturation levels of the endocrine system between Tanner Stages. TS5 adolescents are more similar to young adults in hormonal responses to EX than are TS4 adolescents. Arq Bras Endocrinol Metab. 2011;55(3):213-8 Keywords Physical activity; endocrine system; Tanner Stage; youth ReSumoObjetivo: Avaliar as respostas hormonais ao teste de exercício em estágios incrementais (EX) até exaustão. Sujeitos e métodos: Foram examinados adolescentes com 16 anos de idade e índice Tanner 4 (TS4) e com 17 anos de idade e índice Tanner Stage 5 (TS5) (n = 6), e adultos com 21 ± 1 anos de idade. (X ± SD) (n = 4), estes últimos compondo o grupo controle. As amostras de sangue foram retiradas no repouso e ao final de cada estágio EX. Resultados: Os principais efeitos observados no EX ocorreram no cortisol (p < 0,01, aumentou com a elevação do estágio EX) e no grupo de testosterona (p < 0,01; TS4 < TS5, adultos). Houve efeito de interação entre grupos e por estágio de EX no grupo de hormônio de crescimento (p < 0,05). O hormônio de crescimento aumentou em todos os grupos em resposta ao EX, no entanto, a magnitude dos aumentos observados foi significativamente menor em TS5 e nos adultos do que em TS4. Conclusões: As diferenças verificadas nas respostas dos grupos de testosterona e hormônio de crescimento em TS4 em relação ao TS5 e adultos refletem os diferentes níveis de maturação do sistema endócrino entre os estágios do índice de Tanner. Os adolescentes no TS5 se assimilam mais aos jovens adultos do que aos adolescentes TS4, quanto a suas respostas hormonais ao EX.Arq Bras Endocrinol Metab. 2011;55(3):213-8 Descritores Atividade física; sistema endócrino; Etapa Tanner; jovem

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“…Muscle contraction and the production of catecholamines are those mechanisms that cause metabolic adaptation during physical activity (41). These mechanisms cause decrease in insulin secretion and increase in glucagon production via afferent which enhances the available energy substrates by EPG increase and glucose absorption.…”

Section: Discussionmentioning

confidence: 99%

Comparison of Substrate Oxidation and Energy Expenditure During Acute Aerobic Exercise With Moderate and High Intensity in Patients With Type 2 Diabetes

Nasab

Ranjbar

Habibi

et al. 2015

Jentashapir J Health Res

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Background: Type 2 diabetes and obesity are related to other metabolic disorders such as insulin resistance, high blood pressure, visceral obesity increase and metabolic syndrome with high danger of cardiovascular disease expansion. Objectives: This study aimed to determine whether in patients with type 2 diabetes, substrate oxidation and energy expenditure were affected by the type of intensity of acute aerobic exercise they were provided. Materials and Methods: Nine men with type 2 diabetes (Mean ± SD; age 52.6 ± 0.36 years, Body Mass Index (BMI) = 30.3 ± 2.4) and 9 obese control group (Mean ± SD; age 49.1 ± 1.4 years, BMI = 31.3 ± 1.8) were participated in this study. In the first session, anthropometric measurements, body composition and maximum oxygen uptake (VO 2 peak) were measured in all subjects. In the next sessions, subjects completed two acute aerobic exercises on separate days in a crossover design. The two exercise trials performed at intensity of 60% and 80% VO 2 peak after fasting for at least 10 hours. Means of volume of oxygen (VO 2 ) and Volume of Carbon dioxide (VCO 2 ) were calculated during 30 minutes for measuring the rates of fat oxidation, carbohydrate oxidation and energy expenditure at each intensity. Results:The results showed that substrate oxidation and energy expenditure were lower in the diabetic group (P < 0.05) compared to the control one. Also, the results revealed that carbohydrate oxidation and energy expenditure were statistically increased by providing high intensity rather than moderate intensity; however, fat oxidation was statistically increased by providing moderate intensity rather than high intensity (P < 0.05). Conclusions: According to the results of the present study, aerobic exercise at moderate intensity and proper time can be considered as a special treatment to prevent diabetes complications and related disorders, particularly obesity.

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Plasma Hormones and Physical Exercise

Cited by 125 publications

References 34 publications

Stress and muscle damage monitoring in high-level basketball players

Stress and muscle damage monitoring in high-level basketball players

Comparison of the hormonal responses to exhaustive incremental exercise in adolescent and young adult males

Comparison of Substrate Oxidation and Energy Expenditure During Acute Aerobic Exercise With Moderate and High Intensity in Patients With Type 2 Diabetes

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