| Autor: |
Macena ML; Faculdade de Nutrição, Universidade Federal de Alagoas, Maceió, Alagoas, Brasil., da Silva Júnior AE; Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, SP, Brasil., Praxedes DRS; Faculdade de Nutrição, Universidade Federal de Alagoas, Maceió, Alagoas, Brasil., Vasconcelos LGL; Hospital Universitário Professor Alberto Antunes, Maceió, Alagoas, Brasil., Pureza IROM; Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, SP, Brasil., Florêncio TMMT; Faculdade de Nutrição, Universidade Federal de Alagoas, Maceió, Alagoas, Brasil., Bueno NB; Faculdade de Nutrição, Universidade Federal de Alagoas, Maceió, Alagoas, Brasil. |
| Abstrakt: |
Reducing sedentary behaviour (SB) and increasing physical activity (PA) by sitting less and standing/walking more is advised to prevent chronic diseases. However, the mechanisms underlying this recommendation are not well established, especially in individuals with obesity living in low-income regions. The present study evaluated whether there are associations between PA indicators (PAI - standing time, walking time and the number of steps/d) and SB indicators (SBI - sitting/lying down time) with the hormonal profile and resting energy expenditure (REE) of adult women living in a low-income region. This is a cross-sectional study. We collected data on hormones (insulin resistance, leptin and thyroid axis), body composition (tetrapolar bioimpedance), REE (indirect calorimetry), and PAI and SBI (triaxial accelerometers, ActivPAL). Multivariable linear models adjusting for age and fat-free mass were performed. Fifty-eight women (mean age of 31 years and BMI of 33 kg/m 2 ) were included. The mean sitting/lying down time and standing time were 16·08 and 5·52 h/d, respectively. Sitting/lying down time showed a direct association with free thyroxine (FT 4 ) ( β = 0·56 ng/dl; 95 % CI = -1·10, -0·02). Standing time showed a direct association with FT 4 ( β = 0·75 ng/dl; 95 % CI = 0·01; 1·48) and inverse association with free triiodothyronine ( β = -2·83 pg/ml 95 % CI = -5·56, -0·10). There were no associations between PAI and SBI with the REE, insulin resistance, leptin and thyroid-stimulating hormone. Thus, decreased SB is associated with thyroid hormones levels but not with REE, insulin resistance or leptin in women with obesity living in low-income regions. |
