Introduction. Physical exercise and thyroid function affect the course and outcome of pregnancy. Pregnancy conversely has an effect on exercise and the secretion of thyroid hormones. It is recommended that pregnant women without medical or obstetric complications engage in physical exercise, as correct exercise and suitable hormonal therapy reduce the risk of a negative course and outcome of the pregnancy. Case report. A 33year-old marathon runner with diagnosed Hashimoto's thyroiditis continued to run until she was ready to give birth. The recorded parameters were body mass, and scope and intensity of running. In the third trimester, additional recorded parameters were blood pressure, pulse, blood glucose, prolactin, cortisol and thyroid hormones [thyroxine (T4 and thyroid-stimulating hormone (TSH)]. Foetus growth and development, as well as the status of the subject's health, were monitored at regular endocrinological and gynaecological examinations. There was an expected increase in body mass during pregnancy, which resulted in a reduction in the running distance and intensity. TSH, cortisol and prolactin blood levels were increased. Statistically, significant correlation has been obtained between TSH and the intensity of running (r = 0.864; p = 0.027). Using the method of cardiotocography (CTG), the average pulse rate in the lower reference range has been recorded (118 bpm). The delivery was induced at the scheduled date. There were no complications in the course and outcome of the pregnancy. Conclusion. Moderate to light aerobic physical exercise had no negative effect on the course and the outcome of the pregnancy in the subject with Hashimoto's thyroiditis.

The World Health Organization recommends infants should be exclusively breastfed for the first six months of life. Various factors can affect the maintenance of lactation. Increased physical activity and stress are thought to negatively affect breastfeeding success. The aim of this case study was to examine the effect of high serum creatine-kinase (CK) values and the success of breastfeeding after sports competition. It is assumed that continuous aerobic exercise is a stress for the body that can have a negative impact on lactation and extended breastfeeding. Methods. The level of acute muscle damage (AC) was measured before and after the competition in order to confirm continuous exposure to aerobic exercise. Results. After the competition, elevated serum creatine-kinase levels were noted. Prolactin and TSH values remained within optimal values. Conclusion. Several months of preparation for the competition had an impact on increasing acute muscle damage (AC) after the competition. No negative effect of continuous aerobic exercise on breastfeeding success was observed in this case study.

Introduction. The World Health Organization (WHO) exclusively recommends breastfeeding for the first six months of the newborn life. Many factors affect milk production. Physical exercise can significantly affect prolactin secretion in the blood. Case report. A respondent in this study was a primipara (33 years old) diagnosed with Hashimoto's thyroiditis and a singleton pregnancy. During pregnancy and after the childbirth, she continued with light to moderate physical exercise. During the first six months after the childbirth, the light to moderate intensity aerobic exercise had no negative impact on the blood level of prolactin and growth and development of the child. Conclusion. In this case study, light to moderate intensity aerobic exercise had no negative impact on the level of prolactin in the blood during the first six months after the childbirth in a woman with Hashimoto's thyroiditis.Key words: breast feeding; hypoparathyroidism; prolactin; exercise. ApstraktUvod. Svetska zdravstvena organizacija (SZO) preporučuje isključivo dojenje tokom prvih šest meseci nakon rođenja novorođenčeta. Mnogobrojni su faktori koji utiču na proizvodnju mleka. Fizičko vežbanje može značajno uticati na lučenje prolaktina u krvi. Prikaz slučaja. Ispitanica u ovoj studiji bila je prvorotka (33 godine) sa dijagnostikovanim Hašimoto tireoiditisom i jednoplodnom trudnoćom. U trudnoći i nakon porođaja nastavila je sa kontinuiranim vežbanjem lakog do umerenog intenziteta. Ustanovljeno je da ovakvo vežbanje, tokom prvih šest meseci nakon porođaja, nije imalo negativni uticaj na nivo prolaktina u krvi i rast i razvoj odojčeta. Zaključak. U ovoj studiji slučaja, aerobno vežbanje lakog do umerenog intenziteta nije imalo negativnog uticaja na nivo prolaktina u krvi tokom prvih šest meseci nakon porođaja kod žene sa Hašimoto tireoiditisom.

Summary: International guidelines (WHO) recommend thirty minutes of moderate-to-vigorous aerobic physical activity (MVPA) per day during school hours, which is half of the recommended daily physical activity. Also, the importance of physical activity with a minimum time duration of ten minutes per day in MVPA is highlighted. However, previous research points to the insufficient interest of pupils in exercise, both in physical education classes and during free time after school. The aim of the review paper was to highlight the results of randomized clinical studies describing the impact of organized physical exercise on motivation and increasing the time spent in MVPA through a systematic review of the scientific literature. The results of the researchers point to the problem of motivation of students aged 6-14 as well as the insufficient effectiveness of applied physical exercise program in teaching. Of all physical activities realized during one school year, team practice in class (various team games) proved to be the most effective. Further research is needed to define factors that have an impact on students' motivation for greater participation in physical education classes. In particular, it is important to develop awareness of the importance of daily physical activity, but which is performed with occasional increased intensity of exercise.