The predictor of interactions of three variables: protein intake (g/person/day), vitamin D intake (µg/day) and phosphorus intake (mg/day) was significant for BMD dis (adjusted R 2 = 0.59 p < 0.001). The presented model explained 48–67% (adjusted R 2 = 0.48–0.67 p < 0.001) of the variance in bone parameters. Relationships between BMD, bone mineral content (BMC) in the distal and proximal part of the forearm and PA, sit time and eating parameters were evaluated using the multiple forward stepwise regression. The strongest relationships with BMD in distal part of forearm were found for moderate plus vigorous activity, sit time, and intake of dairy products, intake of calcium, protein, vitamin D, phosphorus from diet. Data collection on total physical activity level was performed by collecting information on the number of days and the duration of vigorous and moderate intensity (MVPA) and average daily time spent in sitting (SIT time). Sedentary behaviour and physical activity was assessed in a face-to-face interview conducted using the International Physical Activity Questionnaire. Dairy product consumption and eating habits were assessed by means of a dietary interview. Methodsīone parameters were measured by dual energy x-ray absorptiometry using paediatric specific software to compile the data. To identify these modifiable factors we analysed the relationship between dairy product consumption, eating habits, sedentary behaviour, and level of physical activity with BMD in 115 young boys (14–17 years). Understanding the modifiable factors that improve bone parameters at an early age is necessary to early prevent osteoporosis. Peak bone mass is built and its level significantly affects the condition of bones in later years of life. During childhood and adolescence, skeletal microarchitecture and bone mineral density (BMD) undergo significant changes.
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