The aim of this study was to conduct three-year monitoring of bone mineralization (BMC) and bone mineral density (BMD) of adolescent girls engaged in swimming at the time of attaining the peak bone mass and of their counterparts leading a rather sedentary life, considering the intakes of calcium, phosphorus and protein, as well as the proportions among those nutrients. Two groups of girls aged 11–13 years were studied 3 times at yearly intervals: untrained controls (n = 20) and those engaged in competitive swimming (n = 20). Bone density was determined by dual-energy X-ray absorptiometry (DXA) in the lumbar spine (L2 – L4). Nutrient intakes (energy, protein, calcium, phosphorus) were assessed from 24-h recalls. The group of swimmers had significantly lower BMI values than the control group. No systematic, significant between-group differences were found in nutrient intake or in bone mineralization variables. Calcium intake was below the recommended norm in all subjects but mean values of bone mineralization variables (BMC, BMD) steadily increased in both groups. The BMD z-scores proved negative throughout the three-year period of early adolescence in both groups of girls and that decrease was significant in swimmers. This could have been due to insufficient calcium intake as well as to inadequate calcium-to-phosphate and protein-to-calcium ratios and, when continued, might result in a decreased bone mass in adulthood.

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The objective of this study was to evaluate bone mineralization (BMC) and bone mineral density (BMD) of the osseous tissue in girls training swimming an being in the period of reaching the peak bone mass, as compared to girls being at a similar age and non-practicing sport, taking into account dietary allowances for calcium and phosphorus and dietary ratios of these elements.Both the swimmers and their non-training colleagues were found to meet nutritional demands to the same extent and their diets did not differ in the intakes of energy nor nutrients (protein, calcium, phosphorus), which is incorrect in the case of the non-training girls. An alarmingly low intake of calcium at a, simultaneously, excessive intake of protein and phosphorus, as well as incorrect ratios between calcium and phosphorus and between calcium and protein observed especially in the case of the swimmers, might have an adverse effect on the mineralization of osseous tissue in the period of reaching peak bone mass.

Diabetes Vs. Physical ExerciseDiabetes is a disease affecting people of all races in the world, it can appear at any age. It is considered to be social disease due to the incidence and complications. It is a disease of complex etiology, classified as a metabolic disease with chronic hyperglycemia. It requires intensive hypoglicemizing therapy. There are two types of diabetes: type I and type II with different etiologies and varied clinical picture.In the case of prolonged illness serious complications develop, from which, however, the sick may be saved, on condition of the patient's absolute submission to the rigors of treatment. It is possible to live an active life and even practice sports. Extremely important in this case is the correct blood glucose, providing for adjusted glucose homeostasis, which is promoted by physical activity. Physical exercise can be an important therapeutic agent in treating diabetes, provided the criteria of its physiological tolerance are determined. It is vital that an individual approach to the patient is made, associated with the duration of the disease and existing complications. Patient education in monitoring patients' glucose levels is important, i.e. the efficiency in the implementation of individual insulin therapy and hyperglycemia or hypoglycemia self-prevention during and after physical exercise. Patients who decide to practice sport should find the optimal way to control exercise, and diet during and after exercise, then the sporting success is possible.

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