Obesity and dynapenia are separated factors for the decline in mobility and lower limb function in elderly people. Besides that, those who present a combination of abdominal obesity and dynapenia evolve with worse closures of health than those who only own abdominal obesity or dynapenia. However, few evidences are showing that there is such effect age, period, and cohort of dynapenic abdominal obesity over the mobility and lower limb function in elderly people. Furthermore, recent data may not reflect the current populational trend. Thus, the objectives of the present proposal are to analyze the age, period, and cohort effects of the dynapenic abdominal obesity over 1) the decline in mobility; 2) the decline in lower limb function, and 3) analyze the differences between sexes. For that, thanks to a partnership of the present proposal's advisor with the Department of Epidemiology and Public Health of the University College London (UCL), longitudinal data and different cohorts from English Longitudinal Study of Aging - ELSA will be used. The baseline of the study will be the wave of 2004/2005. In order to estimate the age, period, and cohort effects, cohort data 3, 4, 6, and 7 will also be used. The final sample for analysis of the decline in mobility will be composed by 13.473 participants of ELSA, and 11.548 for the decline in lower limb function. Mobility will be assessed by the walking speed in meters/second, and the lower limb function will be evaluated by Short Physical Performance Battery (SPPB). Abdominal obesity will be defined for values of waist circumference > 102 cm for men, and > 88 cm for women, and dynapenia for values of handgrip strength < 26 kg for men, and < 16 kg for women. The participants will be classified as (0) non-abdominal obese/non-dynapenic; (1) abdominal obese/non-dynapenic; (2) non-abdominal obese/dynapenic, and (3) dynapenic abdominal obese. Age-Period-Cohort models will be adopted in order to analyze the effect of dynapenic abdominal obesity under the decline in mobility and lower limb function.
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