جستجوی مقالات مرتبط با کلیدواژه « immunoglobulin » در نشریات گروه « تربیت بدنی »

Sleep deprivation is more common in military personnel due to missions and military operations, and they are scheduled to be deprived of sleep at special times at night posts, respectively. However, sleep deprivation has effects negative and irreversible. Therefore, the purpose of the present study was to investigate the functional response, immune system and hormonal levels of the military to short-term sleep deprivation at different times of the night.

The present study began with the purposeful and voluntary selection of 40 healthy military personnel, they were randomly divided into 4 groups (Group 1: Deprivation from 12am to 2am; Group 2: Deprivation from 2am to 4am, Group 3: Deprivation from 4am to 6am and Group 4: control group). Each group was evaluated in two stages before and after sleep deprivation.

There was a significant difference in pre and post-test sleep deprivation hours 12am to 2am static and dynamic balance, auditory and visual reaction time. Also, in deprivation hours 2am to 4am significantly changed the auditory and visual reaction time and cortisol. In addition, were increased cortisol and melatonin at time 4am to 6am (p<0.05).

The negative effects of sleep deprivation appear to occur at different dimensions and with different times, but only 12 to 2 deprivation have a deleterious effect on balance and reaction time and 2 to 4 deprivation on reaction time and cortisol.

Psychological stresses induced by competition, can cause immune system alternations, which predisposes the athletes to infectious diseases more than common exercises. Therefore, the purpose of this study was to examine the effects of official sports competition on leucocyte, and subsets counts, immunoglobulin A (IgA), G (IgG), and cortisol levels in male karatekas. Ten male karatekas (aged: 22.9±2.6 yr, height 176.4±8.3 cm, and body mass index 21.2±1.5 kg/m2), acceded to final competition of Ilam province, were selected. Blood samples were collected before, immediately and 2 hours after the competition to measure the number of leukocytes, neutrophils, lymphocytes, monocytes, eosinophil’s counts and IgA, IgG and cortisol levels. The leucocyte (P=0.001), lymphocyte (P=0.001), and monocyte (P=0.003) counts were significantly increased immediately after the competition but returned to baseline 2h after the competition. Neutrophil and eosinophil counts did not change immediately and 2h after the competition (P>0.05). The serum levels of IgA (P=0.037) and IgG (P=0.04) were decreased significantly immediately after the competition and returned to baseline 2h after the competition. Also, the serum cortisol level was increased significantly immediately after the competition (P=0.0001) but decreased 2h later, compared to before (P=0.01) and immediately (P=0.001) after the competition results. Based on the findings of the present study, official competition can cause transient depression on humoral immunity in young male karatekas. It seems that 2h rest after the competition is sufficient for the recovery of leucocyte subset counts and immunoglobulin changing induced by competitions.

The aim of this study was to examine the effect of aerobic interval training on plasma immunoglobulins levels in 30 obese and non-obese young men. The subjects were divided into 2 groups: the obese group (n=15, mean age 23 yr, height 173 cm, weight 98 kg, body fat percent 28.6%) and non-obese group (n=15, mean age 21 yr, height 177 cm, weight 69 kg, body fat percent 12.5%). Both groups received aerobic interval training protocol for 8 weeks, 3 sessions per week, each session 90 minutes including 10 minutes of warm-up, 5 sets of 9-min running with 60-70% MHR, 4 minutes of passive recovery and 5-10 minutes of cooling down. The subjects’ blood samples were collected before and after the protocol to evaluate the levels of IgA, IgG and IgM. To compare the intra-group differences, dependent t test was used and independent t test was applied to compare inter-group differences at significance level of (P≤0.05). The results showed that 8 weeks of aerobic interval training with 60-70% MHR equally decreased IgG, IgM and IgA in both groups without any differences. The aerobic interval training did not induce a different effect in both groups. Consequently, the duration of this study might not be so sufficient that a suitable adaptation could not be reached and therefore training duration, training intensity and the primary levels of activity of participants can affect the results of study.

Introduction and Intense exercise in general preparation and conditioning periods of pre-competition would affect athletes immune system. So, the aim of this study was tocompare the levels of serum IgA, IgG, IgM, testosterone and cortisol on semi-endurance elite runners during general preparation and competition phase of training. Thirteen semi-endurance elite male runners with an average age of 18.92±1.7 years volunteered to take part in this study. The runners participated in the selectedtraining for a period of 14 weeks and 12 seasons per a week (in the morning and afternoon). Blood samples were collected during the three phases of training (pre- preparation phase, postpreparationphase and after pre-competition phase). Data were analyzed by repeated measures and Bonferroni post hoc test, at a significance level of P<0
05. The training courses in the preparation and competition period, lead to the reduced but not significant in serum IgG levels in elite semi-endurance runners. The means of within groups in serum IgM levels during preparation period reduced significantly in elite endurance runners (P=0.004). During this period, there was no significant change in serum IgA levels; Cortisol levels during preparation pre-competition period in elite semiendurance runners changed significantly (P=0.041). During this period serum testosterone levels did not changed significantly.T/C ratio during preparation and pre-competition phase changed significantly (P=0.040).Discussion and Findings indicated that long and intensive exercises increases catabolic process and may weaken the immune system.