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| 2. |
- Ruiz, Jonatan R., et al.
(författare)
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Relations of total physical activity and intensity to fitness and fatness in children : the European Youth Heart Study
- 2006
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Ingår i: American Journal of Clinical Nutrition. - : Elsevier BV. - 0002-9165 .- 1938-3207. ; 84:2, s. 299-303
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Tidskriftsartikel (refereegranskat)abstract
- Background: It is unclear how the amount and intensity of physical activity (PA) are associated with cardiovascular fitness (CVF) and body fatness in children.Objective: We aimed to examine the associations of total PA and intensity levels to CVF and fatness in children.Design: A cross-sectional study of 780 children aged 9–10 y from Sweden and Estonia was conducted. PA was measured by accelerometry and was expressed as min/d of total PA, moderate PA, and vigorous PA. CVF was measured with a maximal ergometer bike test and was expressed as W/kg. Body fat was derived from the sum of 5 skinfold-thickness measurements. Multiple regression analysis was used to determine the degree to which variance in CVF and body fat was explained by PA, after control for age, sex, and study location.Results: Lower body fat was significantly associated with higher levels of vigorous PA, but not with moderate or total PA. Those children who engaged in >40 min vigorous PA/d had lower body fat than did those who engaged in 10–18 min vigorous PA/d. Total PA, moderate PA, and vigorous PA were positively associated with CVF. Those children who engaged in >40 min vigorous PA/d had higher CVF than did those who accumulated <18 min vigorous PA/d.Conclusions: The results suggest that PA of vigorous intensity may have a greater effect on preventing obesity in children than does PA of lower intensity, whereas both total and at least moderate to vigorous PA may improve children's CVF.
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- Sjöström, Michael, et al.
(författare)
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The European Youth Heart Study (EYHS)
- 2006
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Ingår i: EUROPEAN JOURNAL OF PUBLIC HEALTH. - 1101-1262. ; 16, s. 22-22
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Konferensbidrag (refereegranskat)
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| 4. |
- Wärnberg, Julia
(författare)
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Inflammatory status in adolescents : the impact of health determinants such as overweight and fitness
- 2006
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Overweight prevalences are rising among youth and the prevention of associated chronic diseases is priority concern in public health. Inflammatory processes are involved in the pathogenesis of cardiovascular diseases and may also play an important initiating role in the development of the cardiovascular lesion. The overall aim of this thesis was to establish reference values of body fat composition in adolescence and to investigate the association between chronic low-grade inflammation and overweight, and further to examine if fitness counteracts this possible association. In total 2160 13 to 18 year-old Spanish adolescents were studied and a subsample of 493 subjects were randomly selected for blood sampling and the study of inflammatory status. Studied parameters were: detailed anthropometry, fitness and for the evaluation of inflammatory status, serum acute phase proteins (C-reactive protein, ceruloplasmin and complement factors C3 and C4), as well as in vitro production of interleukin-6 and tumor necrosis factor-cc by peripheral blood mononuclear cells. The main result of this thesis was that overweight adolescents had moderately raised inflammatory markers, which indicates that this population is in a state of chronic low-grade inflammation. Correlations between most body fat estimates and acute phase proteins suggest a proinflammatory action of the adipose tissue. Moreover, central obesity seems to be an independent determinant of C3 concentrations. Overweight was associated with low-grade inflammation independently of fitness status, suggesting that the modulation is mediated by body fat rather than fitness status. C3 however, was independently associated with fitness and could be a new biomarker or involved in the mechanisms of the health benefits of fitness. Whether low-grade inflammation is predicting future diseases or is merely a practical marker of body fat, is beyond the possible answers of this thesis, but nevertheless, this outcome points to the importance of maintaining an appropriate body weight to keep inflammatory status low which could eventually contribute to improve the health status of the next generation's adult population.
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