@article{RietschGodinaScheffler2013,
  author    = {Rietsch, Katrin and Godina, Elena and Scheffler, Christiane},
  title     = {Decreased external skeletal robustness in schoolchildren : a global trend? Ten year comparison of Russian and German data},
  year      = {2013},
  language  = {en}
}
@article{RietschGodinaScheffler2013,
  author    = {Rietsch, Katrin and Godina, Elena and Scheffler, Christiane},
  title     = {Decreased External Skeletal Robustness in Schoolchildren - a Global Trend? ; Ten Year Comparison of Russian and German Data},
  series = {PLoS one},
  volume    = {8},
  journal   = {PLoS one},
  number    = {7},
  publisher = {PLoS},
  address   = {San Fransisco},
  issn      = {1932-6203},
  doi       = {10.1371/journal.pone.0068195},
  pages     = {7},
  year      = {2013},
  abstract  = {Objectives: Obesity and a reduced physical activity are global developments. Physical activity affects the external skeletal robustness which decreased in German children. It was assumed that the negative trend of decreased external skeletal robustness can be found in other countries. Therefore anthropometric data of Russian and German children from the years 2000 and 2010 were compared. Methods: Russian (2000/2010 n = 1023/268) and German (2000/2010 n = 2103/1750) children aged 6-10 years were investigated. Height, BMI and external skeletal robustness (Frame-Index) were examined and compared for the years and the countries. Statistical analysis was performed by Mann-Whitney-Test. Results: Comparison 2010 and 2000: In Russian children BMI was significantly higher; boys were significantly taller and exhibited a decreased Frame-Index (p = .002) in 2010. German boys showed significantly higher BMI in 2010. In both sexes Frame-Index (p = .001) was reduced in 2010. Comparison Russian and German children in 2000: BMI, height and Frame-Index were different between Russian and German children. German children were significantly taller but exhibited a lower Frame-Index (p<.001). Even German girls showed a significantly higher BMI. Comparison Russian and German children in 2010: BMI and Frame-Index were different. Russian children displayed a higher Frame-Index (p<.001) compared with Germans. Conclusions: In Russian children BMI has increased in recent years. Frame-Index is still higher in Russian children compared with Germans however in Russian boys Frame-Index is reduced. This trend and the physical activity should be observed in the future.},
  language  = {en}
}
@article{RietschEccardScheffler2013,
  author    = {Rietsch, Katrin and Eccard, Jana and Scheffler, Christiane},
  title     = {Decreased external skeletal robustness due to reduced physical activity?},
  series = {American journal of human biology : the official journal of the Human Biology Council},
  volume    = {25},
  journal   = {American journal of human biology : the official journal of the Human Biology Council},
  number    = {3},
  publisher = {Wiley-Blackwell},
  address   = {Hoboken},
  issn      = {1042-0533},
  doi       = {10.1002/ajhb.22389},
  pages     = {404 -- 410},
  year      = {2013},
  abstract  = {Objectives Childhood obesity is a global problem, e.g., due to physical inactivity. External skeletal robustness (Frame-Index) has decreased in German schoolchildren. An association between Frame-Index and physical activity was assumed. Further often body mass index (BMI) is analyzed without reference to bone structure. Therefore, we analyze relationships between Frame-Index, BMI, \% body fat, and physical activity. Methods In a cross-sectional study, 691 German children aged 610 years were investigated. BMI, \% body fat, Frame-Index, total steps p.w., sports club rate p.w., training time p.d., and TV-time p.d. were determined. Results Total steps (P<0.001), BMI (P<0.001), and \% body fat (P=0.024) are positively linked to Frame-Index. Total steps (P<0.001), sports club rate (P=0.001), and training time (P<0.001) are negatively associated with \% body fat. Total steps (P=0.017) are negatively linked to BMI. TV-time is positively related to BMI (P<0.001) and \% body fat (P<0.001). \% Body fat is affected by age (P<0.001), sex (P=0.028), and total steps (P=0.002). BMI is influenced by age (P<0.001), and Frame-Index by sex (P<0.001) and total steps (P=0.029). Principal component analysis indicates an association between BMI and TV-time and Frame-Index and total steps. Conclusions We demonstrate an association between external skeletal robustness and physical activity, which is not captured by in BMI measurements. Children should be physically active in order to maintain skeletal robustness. Am. J. Hum. Biol. 25:404410, 2013.},
  language  = {en}
}
@article{RietschEccardScheffler2013,
  author    = {Rietsch, Katrin and Eccard, Jana and Scheffler, Christiane},
  title     = {Decreased external skeletal robustness due to reduced physical activity?},
  year      = {2013},
  language  = {en}
}
@inproceedings{RietschScheffler2011,
  author    = {Rietsch, Katrin and Scheffler, Christiane},
  title     = {Association between skeletal robustness and physical activity in schoolchildren - First results},
  series = {Journal of biological and clinical anthropology : Anthropologischer Anzeiger ; Mitteilungsorgan der Gesellschaft f{\"u}r Anthropologie},
  volume    = {68},
  booktitle = {Journal of biological and clinical anthropology : Anthropologischer Anzeiger ; Mitteilungsorgan der Gesellschaft f{\"u}r Anthropologie},
  number    = {4},
  publisher = {Schweizerbart},
  address   = {Stuttgart},
  issn      = {0003-5548},
  pages     = {516 -- 516},
  year      = {2011},
  language  = {en}
}