جستجوی مقالات مرتبط با کلیدواژه « نسبت تستوسترون به کورتیزول » در نشریات گروه « علوم انسانی »

There are not any detailed knowledge of the effectiveness of morning fasting exercise training on stress and growth hormone levels and the cardiovascular health of young soldiers. Thus, the aim of this study was to investigate the effects of morning exercise training in fasted vs carbohydrate intake on serum levels of cortisol, testosterone and cardiovascular risk factors.

 In a quasi-experimental field study, twenty-four soldiers with moderate to low level of fitness(vo2max<44) were selected from all 18 to 24-year-old soldiers in barracks. Participant were randomly divided into two groups: cryohydrate supplement (n = 12) and placebo (n = 12). The supplement group consumed 6% sucrose solution before starting morning exercises. The morning exercise program consisted of 60 minutes of moderate-intensity aerobic exercise for 6 weeks (4 sessions per week). Before and 48 hours after the last training session, blood samples were collected and other evaluations were measured. Data were analyzed using ANCOVA with a significance level of p <0.05.

 The use of 6% sucrose supplement had a significant effect on cortisol level (p =0.01) and testosterone to cortisol ratio (p =0.028) and waist circumference (p =0.001) in the experimental group compared to the control group. But it had no significant effect on testosterone level and cardiovascular indices (p <0.05).

 Morning exercise training combined with a carbohydrate supplementation compared to fasting can play an important role in the health of young men by lowering cortisol and abdominal obesity, as well as establishing an  anabolic and catabolic balance.

The aim of this study was to compare the effects of three types of combined training on testosterone and cortisol concentration, testosterone/cortisol ratio and muscular strength in elderly women. 40 elderly women (age range: 60.34±0.82 years) were randomly divided into four groups: endurance strength (E) (n=9), strength endurance training (S) (n=10), alternative concurrent training (ACT) (n=12) and control (n=9). The training program was performed for 8 weeks, 3 days per week. Endurance training protocol included performance on a cycle ergometer and strength training protocol involved several selected upper and lower body workouts. Paired samples t test and one-way ANOVA were used to analyze data. The results showed that 8 weeks of training did not change testosterone in S and ACT groups but a significant decrease was observed in testosterone in E group (P=0.007). In addition, results showed a significant difference in testosterone between E and ACT groups (P=0.01). In addition, no significant changes were observed in cortisol and testosterone/cortisol ratio after the training. Also, there was a significant increase in upper body strength only in E and ACT groups and in lower body strength in all groups. As there were no significant changes to basal hormones in 3 combined training groups, these subjects experienced no chronic catabolic state. Since strength increased in all groups, it seems that there was no relationship between hormonal status and the strength gains in the present study.

The aim of this study was to determine effect of a period of 70% decrease in training on strength, power, anabolic and catabolic status of runners. 14 male runners (mean age 23.50±4.06 years, height 178.21±5.95 cm, fat percent 9.93±3.16) voluntarily participated in the study. After the first test, 8 weeks of progressive training started. The second test was conducted after eight weeks. Afterwards, a decrease in training volume phase began. Taper group passed 14 days of 70% decrease in training volume, while control group continued training with the same loading. After 14 days, the third test was carried out under the same conditions. For data analysis, analysis of variance (ANOVA) with repeated measures and Bonferroni post hoc tests were used (P<0.05). Results showed that strength and power improved significantly during the phase in the taper group (P<0.05). During the taper phase, the plasma levels of resting concentration of testosterone, cortisol and testosterone to cortisol ratio did not significantly change (P>0.05). A period of 70% decrease in training volume in runners 14 days before the contests can improve strength and power in addition to a decrease in fatigue which is independent of variations in catabolic and anabolic indices.

Introduction and Resistance exercise is a potent stimulus for acute metabolic hormones such as testosterone and cortisol concentrations increasing. The aim of this study was to examine the acute testosterone and cortisol responses to both forms of volume and strength resistance training to develop and evaluate protocols for athletes and non-athletes. For this purpose, 20 young non-athletes male were selected and randomly divided into two equal groups. In two separate sessions, cross-sectional, volume and strength exercise was administered to both groups. In the first week, group 1 performed; the volume training (70% of One Repetition maximal, 4 set, 1 min rest) and Group 2; strength training (90% of One Repetition maximal, 8 set, 3 min rest), in the second week, the groups changed. Exercise protocol was squat and bench press. Blood samples were obtained before and immediately after each session for testosterone and cortisol measure. Testosterone increased after each training method, but only after resistance training it was significant. Cortisol significantly increased after each training method. Testosterone/ cortisol decreased significantly after both procedures. But the concentration of testosterone, cortisol and Testosterone/ cortisol between groups was not significant (p<0/05).Discussion and The results showed that both forms of volume and strength resistance training caused acute hormonal responses, but were not significant. Meanwhile both were stressful and put body into a catabolic situation.

Introduction & Adiponectin is an adipokine secreted by adipose tissue that its circulating concentrations reduce with obesity، cardiovascular diseases، and diabetes. The purpose of this study was to survey relationships between changes of serum adiponectin levels with testosterone، cortisol، and testosterone to cortisol ratio following exercise training. In a semi-experimental study، twenty healthy men were randomly placed at two groups: exercise training and control. General Characteristics of subjects and serum levels of adiponectin، testosterone، cortisol and testosterone to cortisol ratio were assessed before and after training. Exercise training protocol included twelve weeks pedaling on cycle ergometer (3 sessions per week، intensity 60-70% of reserved heart rate، duration of each session 20-40 min). Data analyzed by SPSS16 software. Statistical significance was accepted at P<0. 05. Exercise training increased serum adiponectin concentration (p=0. 021)، while decreased serum testosterone concentration (p=0. 013) and testosterone to cortisol ratio (p=0. 047)، and serum levels of cortisol did not find significant change (p=087). Also، changes of serum adiponectin concentration in exercise training group were positively correlated to body fat percent changes (p=0. 003)، but had no significant correlations to changes of testosterone (p=0. 73) and cortisol concentrations (p=0. 098)، and to testosterone to cortisol ratio (p=0. 125). Changes of serum adiponectin levels following exercise training have no relations to changes of testosterone or testosterone to cortisol ratio، but it appears that exercise training may cause to increase circulating levels of adiponectin via decreasing body fat percent.