درخت حوزه‌های تخصصی

Background: Along with the outbreak of coronavirus and quarantine practices in many countries, physical activities have certainly been severely restricted. The purpose of this review was to investigate the role of technology in maintaining and improving physical health. Method: For this systematic review study, the research method in this study included searching on PubMed and Google Scholar databases. Articles written in English and Persian in peer reviewed journals that examining the effect of electronic games and virtual reality on physical fitness were selected for analysis. Then, the eligible studies classifieds based on the study population ages. Results: Of 12563 studies found, 14 studies were eligible to enter the study. Research has shown that the use of technology significantly affect gait, balance, strength, flexibility, and mental functioning of the elderly, as well as balance, strength, endurance, and cognitive abilities in adults and children's physical endurance. Conclusions: According to studies under review, the use of technology has a significant effect on improving and maintaining the physical and mental fitness of people in different ages. So, we can suggest using exergame and virtual reality exercises as a possible intervention to promote and maintain physical and mental fitness in quarantine.

Background: The immune properties of mothers’ milk are well known. But the effects of physical activity on humeral immune properties of mothers’ milk is still undetermined. Therefore, reports on the impact of exercise on IgA concentrations of mothers’ milk is controversial. The purpose of the present study was the investigation of the effects of selected aerobic exercises in maximum intensity of 60-70% of heart rate reserve on IgA concentrations in breast milk as well as body composition. Method: In this research, 28 sedentary women (29±5.7 years; VO2max 36±4 ml/Kg/min), divided into two exercise and control groups through random sampling, took part. The exercise group performed some particular exercises for 10 weeks whereas the control group did not do so. Milk samples were taken from both groups and measured by the ELISA method. Body composition was also measured in different stages of the study. Results: In the rest status, the two groups were identical in terms of IgA concentrations (p= 0.549) and body composition (p=0.204). IgA concentrations under exercise load of 60% (p=0.060) and 70% (p= 0.001) of the HRR respectively showed a significant increase as compared to the resting status mean values in the two groups. Body composition variables were only of significant values in terms of comparing the general effects, only in the factors of group (p=0.003) and reciprocal effect of the grouping - the duration of the exercises (p=0.024). Conclusions: The results of this research show that, under the effects of moderate intensity exercise, the mothers’ secretory immune system experiences some changes. Therefore, IgA concentrations in the milk increase. In addition, with the reduction of fat weight, the decrease of fat mass percentage, and increase in the body density, the level of the mothers’ aerobic fitness is increased, which is in no contradiction with their lactation performance.