期刊
APPLIED PHYSIOLOGY NUTRITION AND METABOLISM
卷 46, 期 10, 页码 1248-1256出版社
CANADIAN SCIENCE PUBLISHING
DOI: 10.1139/apnm-2020-1087
关键词
myokines; FNDC5; diabetes; resistance training; exercise; obesity
资金
- University of New Brunswick
- Canadian Institutes of Health Research (CIHR)
- University of New Brunswick (UNB)
- UNB start-up funds
- New Brunswick Health Research Foundation (NBHRF) establishment grant
- Diabetes Action Canada (DAC)
- Natural Sciences and Engineering Research Council (NSERC)
The study found that acute circuit training does not increase irisin levels in overweight individuals, and irisin response is not associated with measures of body composition, cardiorespiratory fitness, or muscle strength. Further research is needed to explore the release of irisin by different types of exercise across different age groups.
Studies show aerobic exercise increases irisin and leads to health benefits. The impact of circuit training (CT) on irisin in overweight younger and older adults is unknown. The objectives were to determine whether, during an acute bout of CT, changes in irisin differed between overweight younger and older adults, and if irisin is associated with body composition, fitness level, or muscle strength. Inactive, overweight adults aged between 19-35 (25.9 +/- 5.0; n = 15) and 60-75 years (67.7 +/- 4.1; n = 14) participated in this study. The primary exposure variable was an acute bout of CT (12-15 repetitions; 65-70% of 1-repetition maximum; 3 loops). The primary outcome measure was the concentration of irisin determined by ELISA before, during, and after exercise. Repeated-measures analyses showed no effect of time on irisin levels during acute CT, and no interaction effect between age and time (p > 0.05). No associations were observed between changes in irisin and body composition, fitness, or strength (p > 0.05). In conclusion, acute CT does not increase irisin in overweight individuals, and irisin is not associated with the measured outcomes. Further studies are needed to elucidate the release of irisin by different types of exercise across the lifespan. This trial was registered at clinicaltrials.gov (NCT03715088). Novelty: Younger and older adults show a similar irisin response to an acute bout of circuit training. Irisin response is not associated with measures of body composition, cardiorespiratory fitness, or muscle strength.
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