RT Journal Article T1 Association of irisin with fat mass, resting energy expenditure, and daily activity in conditions of extreme body mass index. A1 Pardo, María A1 Crujeiras, Ana B A1 Amil, María A1 Agüera, Zaida A1 Jiménez-Murcia, Susana A1 Baños, Rosa A1 Botella, Cristina A1 Torre, Rafael de la A1 Estivill, Xavier A1 Fagundo, Ana B A1 Fernández-Real, José M A1 Fernández-García, José C A1 Fruhbeck, Gema A1 Gómez-Ambrosi, Javier A1 Rodríguez, Roser A1 Tinahones, Francisco J A1 Fernández-Aranda, Fernando A1 Casanueva, Felipe F K1 Fibronectinas K1 Ghrelina K1 Índice de masa corporal K1 Actividad motora K1 Trastornos de las proteínas sanguíneas K1 Metabolismo energético K1 Anorexia nerviosa K1 Obesidad AB FNDC5/irisin has been recently postulated as beneficial in the treatment of obesity and diabetes because it is induced in muscle by exercise, increasing energy expenditure. However, recent reports have shown that WAT also secretes irisin and that circulating irisin is elevated in obese subjects. The aim of this study was to evaluate irisin levels in conditions of extreme BMI and its correlation with basal metabolism and daily activity. The study involved 145 female patients, including 96 with extreme BMIs (30 anorexic (AN) and 66 obese (OB)) and 49 healthy normal weight (NW). The plasma irisin levels were significantly elevated in the OB patients compared with the AN and NW patients. Irisin also correlated positively with body weight, BMI, and fat mass. The OB patients exhibited the highest REE and higher daily physical activity compared with the AN patients but lower activity compared with the NW patients. The irisin levels were inversely correlated with daily physical activity and directly correlated with REE. Fat mass contributed to most of the variability of the irisin plasma levels independently of the other studied parameters. Conclusion. Irisin levels are influenced by energy expenditure independently of daily physical activity but fat mass is the main contributing factor. PB Hindawi Publishing Corporation SN 1687-8337 YR 2014 FD 2014-04-22 LK http://hdl.handle.net/10668/1846 UL http://hdl.handle.net/10668/1846 LA en NO Pardo M, Crujeiras AB, Amil M, Agüera Z, Jiménez-Murcia S, Baños R, et al. Association of irisin with fat mass, resting energy expenditure, and daily activity in conditions of extreme body mass index. Int J Endocrinol; 2014:857270 NO Journal Article; DS RISalud RD Apr 5, 2025