مطالب

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.

The present study attempts to demonstrate how different texts with various author attitudes depict the oppressed subjects of Stalin’s time.  For this purpose, Roland Barthes’ notion of ‘Modes of Writing’ and Michel Foucault’s concept of ‘author’ are employed in reading Alexander Solzhenitsyn’s One Day in the Life of Ivan Denisovich (1963) and Julian Barnes’ The Noise of Time (2016). The two novels mainly address the politically subjected characters in the Stalinist regime with different standpoints of author figure. Originating the authors’ modes of writing in the mentioned texts, on one hand, and the analysis of author-function, on the other, shall satisfy the comparative tendencies in this research and show how these theoretical frameworks can help a critical understanding of the texts. The subjects described in these novels, although similar in their situations and characteristics and subjected to the same institution of power, are narrated from different author roles and provide a somewhat similar subjectivity. The author figure as a subject of ideology and the text as a created object of an author can be thoroughly analyzed within the proposed theoretical framework; therefore, the main objective of this paper is to explore the depicted subjectivities of similar subjects from different standpoints of distinguishable author figures.