Atividade física, comportamento sedentário e fragilidade em idosos: estudo de base populacional

Abstract

The objectives of this study were a) to analyze the relationship between physical activity combined with sedentary behavior with fraility, ajusted by sociodemographic aspects; and b) to identify time spent in sedentary behavior as discriminant criteria for frailty in the elderly. Analytical observational study with cross-sectional design. The participants were 457 elderlies in Alcobaça-BA who aged ≥ 60 years. The frailty condition was defined by the presence of three or more of the following criteria: unintentional weight loss, low walking speed to walk 4.57m, grip strength reduced, exhaustion and low levels of physical activity, and also the participants were classified as not frail and frail. physical activity level(PA) and time exposure to sedentary behavior (SB) were assessed using the long of the version International Physical Activity Questionnaire (IPAQ), which was adapted for elderly. Descriptive (frequency, mean) and inferential (chi-square test, curve Receiver Operating Characteristic [ROC] and Poisson regression) procedures, p ≤ 0,05, were used for the data analysis. Frailty prevalence was 8.8% (n = 40) when it was not considered the low level of physical activity to classify the frailty condition and 22.1% (n = 101), when considering the five benchmarks syndrome frailty. The combination of physical activity level and time exposure to sedentary behavior was associated with elderly frailty condition only to the combined condition of negative behavioral outcomes (AF < 150 min / week and CS ≥ 540 min / day) showing RP = 2.83 (95% CI: 1.23-6.52). The largest area under the ROC curve for the time exposure to sedentary behavior was identified in men. It was observed that > 495 minutes / day (men) or > 536 minutes / day (women) were the best cutoff points for predicting the frailty syndrome. The frailty condition is more prevalent among the elderly who have insufficient levels of physical activity combined with high exposure to sedentary behavior, even when adjusted by sociodemographic factors. The highest daily exposure to sedentary behavior can discriminate the presence of frailty in the elderly of both gender.