![]() The magnitude of lipolysis (fatty acid release from adipocytes) and the amount of post-meal carbon and nitrogen returning to abdominal adipose tissue determines the final fat tissue mass. ![]() In brief, carbon and nitrogen redistribution to challenged tissues (muscle and lungs) for fuel replenishment and cell regeneration against abdominal adipose tissue seems to be the fundamental mechanism underlying the intensity-dependent fat loss effect of exercise. In this review, alternative perspectives to explain the fat loss outcome are discussed. The unchanged 24-h fatty acid oxidation during and after exercise does not provide support to the causality between fat burning and fat loss. Nevertheless, increasing exercise intensity decreases oxidation of fatty acids derived from adipose tissue despite elevated lipolysis. The fat loss effect of exercise has been intuitively thought to result from increased fat burning during and after exercise, defined by conversion of fatty acid into carbon dioxide in consumption of oxygen. 2Laboratory of Exercise Biochemistry, College of Kinesiology, University of Taipei, Taipei, TaiwanĮxercise training decreases abdominal fat in an intensity-dependent manner.1Department of Health Sciences, College of William and Mary, Williamsburg, VA, United States.
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