Dairy product consumption, eating habits, sedentary behaviour and physical activity association with bone mineral density among adolescent boys: a cross-sectional observational study.

BACKGROUND: During childhood and adolescence, skeletal microarchitecture and bone mineral density (BMD) undergo significant changes. Peak bone mass is built and its level significantly affects the condition of bones in later years of life. Understanding the modifiable factors that improve bone parameters at an early age is necessary to early prevent osteoporosis. 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). METHODS: Bone parameters were measured by dual energy x-ray absorptiometry using paediatric specific software to compile the data. Dairy product consumption and eating habits were assessed by means of a dietary interview. Sedentary behaviour and physical activity was assessed in a face-to-face interview conducted using the International Physical Activity Questionnaire. 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). RESULTS: 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. 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 presented model explained 48-67% (adjusted R2 = 0.48-0.67; p < 0.001) of the variance in bone parameters. 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 R2 = 0.59; p < 0.001). The predictor of interactions of two variables: SIT time (h/day) and dairy products (n/day) was significant for BMD prox (adjusted R2 = 0.48; p < 0.001). Furthermore, the predictor of interactions dairy products (n/day), protein intake (g/person/day) and phosphorus intake (mg/day) was significant for BMC prox and dis (adjusted R2 = 0.63-0.67; p < 0.001). CONCLUSIONS: High physical activity and optimal eating habits especially adequate intake of important dietary components for bone health such as calcium, protein, vitamin D and phosphorus affect the mineralization of forearm bones.

[Health-related quality of life in patients with bronchial asthma]. / Jakosc zycia zalezna od stanu zdrowia u chorych na astme oskrzelowa

A patient is not, or at least should not be, a passive subject, but the active participant of the process of asthma treatment. This naturally imposes covering patients with bronchial asthma with a holistic model of care. Assessment of health-related quality of life (HRQoL) is one component of this model. HRQoL of asthma patients can be determined with an array of generic instruments, e.g. Medical Outcomes Survey Short Form 36 (SF-36), EuroQoL questionnaire (EQ-5D) or World Health Organization Quality of Life Questionnaire (WHOQOL), as well as with the specific tools, among which Saint George's Respiratory Questionnaire (SGRO) and Asthma Quality of Life Questionnaire (AQLQ) belong to the most widely used. HRQoL is significantly associated with the degree of asthma control. However, literature data suggest that a determination of HRQoL alone, with either specific or generic instrument, can be insufficient, as the level of health-related quality of life turned out to be modulated by three groups of factors: 1) demographic characteristics of patients, 2) clinical parameters, and 3) personality traits of respondents. Due to particularly strong effect of psychological characteristics on the quality of life of patients with bronchial asthma, also the level of depressiveness should be examined along with the HRQoL determination. Furthermore, complex assessment of the quality of life and its determinants should be conducted longitudinally, either in individual patients or in epidemiological studies.