@article{CarpioAriasAriasMogrovejoNicolaldeCifuentesetal.2021,
  author    = {Carpio Arias, Tannia Valeria and Arias Mogrovejo, Diana Carolina and Nicolalde Cifuentes, Tom{\´a}s Marcelo and Tapia Veloz, Estephany Carolina and Zeeuw, Chris I. de and Vinueza Veloz, Maria Fernanda},
  title     = {Sleep quality does not mediate the negative effects of chronodisruption on body composition and metabolic syndrome in healthcare workers in Ecuador},
  series = {Diabetes \& metabolic syndrome : clinical research \& reviews ; the official journal of DiabetesIndia},
  volume    = {15},
  journal   = {Diabetes \& metabolic syndrome : clinical research \& reviews ; the official journal of DiabetesIndia},
  number    = {1},
  publisher = {Elsevier},
  address   = {Amsterdam [u.a.]},
  issn      = {1871-4021},
  doi       = {10.1016/j.dsx.2021.01.017},
  pages     = {397 -- 402},
  year      = {2021},
  abstract  = {Background and aims: The objective of the present work was to determine to what extent sleep quality may mediate the association between chronodisruption (CD) and metabolic syndrome (MS), and between CD and body composition (BC). Methodology: Cross-sectional study which included 300 adult health workers, 150 of whom were night shift workers and thereby exposed to CD. Diagnosis of MS was made based on Adult Treatment Panel III criteria. Sleep quality was measured using the Pittsburgh Sleep Quality Index. Body mass index (BMI), fat mass percentage, and visceral fat percentage were measured as indicators of body composition (BC). Data were analyzed using logistic, linear regression and structural equation models. Results: The odds of health workers exposed to CD to suffer MS was 22.13 (IC95 8.68-66.07) when the model was adjusted for age, gender, physical activity and energy consumption. CD was also significantly associated with an increase in fat mass and visceral fat percentages, but not to BMI. Surprisingly, there was not enough evidence supporting the hypothesis that sleep quality contributes to the association between CD and MS or between CD and BC. Conclusions: Sleep quality does not mediate the negative effects of CD on MS nor on BC.},
  language  = {en}
}
@article{MuehlbauerGranacherBordeetal.2017,
  author    = {Muehlbauer, Thomas and Granacher, Urs and Borde, Ron and Hortobagyi, Tibor},
  title     = {Non-Discriminant Relationships between Leg Muscle Strength, Mass and Gait Performance in Healthy Young and Old Adults},
  series = {Gerontology},
  volume    = {64},
  journal   = {Gerontology},
  number    = {1},
  publisher = {Karger},
  address   = {Basel},
  issn      = {0304-324X},
  doi       = {10.1159/000480150},
  pages     = {11 -- 18},
  year      = {2017},
  abstract  = {Background: Gait speed declines with increasing age, but it is unclear if gait speed preferentially correlates with leg muscle strength or mass. Objective: We determined the relationship between gait speed and (1) leg muscle strength measured at 3 lower extremity joints and (2) leg lean tissue mass (LTM) in healthy young (age: 25 years, n = 20) and old (age: 70 years, n = 20) adults. Methods: Subjects were tested for maximal isokinetic hip, knee, and ankle extension torque, leg LTM by bioimpedance, and gait performance (i.e., gait speed, stride length) at preferred and maximal gait speeds. Results: We found no evidence for a preferential relationship between gait performance and leg muscle strength compared with gait performance and leg LTM in healthy young and old adults. In old adults, hip extensor strength only predicted habitual gait speed (R-2 = 0.29, p = 0.015), whereas ankle plantarflexion strength only predicted maximal gait speed and stride length (both R-2 = 0.40, p = 0.003). Conclusions: Gait speed did not preferentially correlate with leg muscle strength or leg LTM, favoring neither outcome for predicting mobility. Thus, we recommend that both leg muscle strength and leg LTM should be tested and trained complementarily. Further, hip and ankle extension torque predicted gait performance, and thus we recommend to test and train healthy old adults by functional integrated multiarticular rather than monoarticular lower extremity strength exercises.},
  language  = {en}
}
@article{BrentenMorrisSaltetal.2014,
  author    = {Brenten, Thomas and Morris, Penelope J. and Salt, Carina and Raila, Jens and Kohn, Barbara and Brunnberg, Leo and Schweigert, Florian J. and Zentek, Juergen},
  title     = {Energy intake, growth rate and body composition of young Labrador Retrievers and Miniature Schnauzers fed different dietary levels of vitamin A},
  series = {The British journal of nutrition : an international journal devoted to the science of human and animal nutrition},
  volume    = {111},
  journal   = {The British journal of nutrition : an international journal devoted to the science of human and animal nutrition},
  number    = {12},
  publisher = {Cambridge Univ. Press},
  address   = {Cambridge},
  issn      = {0007-1145},
  doi       = {10.1017/S0007114514000543},
  pages     = {2104 -- 2111},
  year      = {2014},
  abstract  = {Research in rodents has shown that dietary vitamin A reduces body fat by enhancing fat mobilisation and energy utilisation; however, their effects in growing dogs remain unclear. In the present study, we evaluated the development of body weight and body composition and compared observed energy intake with predicted energy intake in forty-nine puppies from two breeds (twenty-four Labrador Retriever (LAB) and twenty-five Miniature Schnauzer (MS)). A total of four different diets with increasing vitamin A content between 5.24 and 104.80 mu mol retinol (5000-100 000 IU vitamin A)/4184 kJ (1000 kcal) metabolisable energy were fed from the age of 8 weeks up to 52 (MS) and 78 weeks (LAB). The daily energy intake was recorded throughout the experimental period. The body condition score was evaluated weekly using a seven-category system, and food allowances were adjusted to maintain optimal body condition. Body composition was assessed at the age of 26 and 52 weeks for both breeds and at the age of 78 weeks for the LAB breed only using dual-energy X-ray absorptiometry. The growth curves of the dogs followed a breed-specific pattern. However, data on energy intake showed considerable variability between the two breeds as well as when compared with predicted energy intake. In conclusion, the data show that energy intakes of puppies particularly during early growth are highly variable; however, the growth pattern and body composition of the LAB and MS breeds are not affected by the intake of vitamin A at levels up to 104.80 mu mol retinol (100 000 IU vitamin A)/4184 kJ (1000 kcal).},
  language  = {en}
}
@misc{BeurskensMuehlbauerGranacher2015,
  author    = {Beurskens, Rainer and M{\"u}hlbauer, Thomas and Granacher, Urs},
  title     = {Association of dual-task walking performance and leg muscle quality in healthy children},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-75100},
  pages     = {7},
  year      = {2015},
  abstract  = {Background Previous literature mainly introduced cognitive functions to explain performance decrements in dual-task walking, i.e., changes in dual-task locomotion are attributed to limited cognitive information processing capacities. In this study, we enlarge existing literature and investigate whether leg muscular capacity plays an additional role in children's dual-task walking performance. Methods To this end, we had prepubescent children (mean age: 8.7 ± 0.5 years, age range: 7-9 years) walk in single task (ST) and while concurrently conducting an arithmetic subtraction task (DT). Additionally, leg lean tissue mass was assessed. Results Findings show that both, boys and girls, significantly decrease their gait velocity (f = 0.73), stride length (f = 0.62) and cadence (f = 0.68) and increase the variability thereof (f = 0.20-0.63) during DT compared to ST. Furthermore, stepwise regressions indicate that leg lean tissue mass is closely associated with step time and the variability thereof during DT (R2 = 0.44, p = 0.009). These associations between gait measures and leg lean tissue mass could not be observed for ST (R2 = 0.17, p = 0.19). Conclusion We were able to show a potential link between leg muscular capacities and DT walking performance in children. We interpret these findings as evidence that higher leg muscle mass in children may mitigate the impact of a cognitive interference task on DT walking performance by inducing enhanced gait stability.},
  language  = {en}
}
@article{BeurskensMuehlbauerGranacher2015,
  author    = {Beurskens, Rainer and M{\"u}hlbauer, Thomas and Granacher, Urs},
  title     = {Association of dual-task walking performance and leg muscle quality in healthy children},
  series = {BMC pediatrics},
  volume    = {15},
  journal   = {BMC pediatrics},
  number    = {2},
  publisher = {BioMed Central},
  address   = {London},
  issn      = {1471-2431},
  doi       = {10.1186/s12887-015-0317-8},
  year      = {2015},
  abstract  = {Background Previous literature mainly introduced cognitive functions to explain performance decrements in dual-task walking, i.e., changes in dual-task locomotion are attributed to limited cognitive information processing capacities. In this study, we enlarge existing literature and investigate whether leg muscular capacity plays an additional role in children's dual-task walking performance. Methods To this end, we had prepubescent children (mean age: 8.7 ± 0.5 years, age range: 7-9 years) walk in single task (ST) and while concurrently conducting an arithmetic subtraction task (DT). Additionally, leg lean tissue mass was assessed. Results Findings show that both, boys and girls, significantly decrease their gait velocity (f = 0.73), stride length (f = 0.62) and cadence (f = 0.68) and increase the variability thereof (f = 0.20-0.63) during DT compared to ST. Furthermore, stepwise regressions indicate that leg lean tissue mass is closely associated with step time and the variability thereof during DT (R2 = 0.44, p = 0.009). These associations between gait measures and leg lean tissue mass could not be observed for ST (R2 = 0.17, p = 0.19). Conclusion We were able to show a potential link between leg muscular capacities and DT walking performance in children. We interpret these findings as evidence that higher leg muscle mass in children may mitigate the impact of a cognitive interference task on DT walking performance by inducing enhanced gait stability.},
  language  = {en}
}