Deterioration of physical performance and cognitive function in rats with short term high fat feeding
Efficiency, defined as the amount of work produced for a given amount of oxygen consumed, is a key determinant of endurance capacity, and can be altered by metabolic substrate supply, in that fatty acid oxidation is less efficient than glucose oxidation. It is unclear, however, whether consumption of a high fat diet would be detrimental or beneficial for endurance capacity, due to purported glycogen sparing properties. In addition, a high fat diet over several months leads to cognitive impairment. Here, we tested the hypothesis that short term ingestion of a high fat diet (55% kcal from fat) would impair exercise capacity and cognitive function in rats, compared with a control chow diet (7.5% kcal from fat) via mitochondrial uncoupling and energy deprivation. We found that rats ran 35% less far on a treadmill and showed cognitive impairment in a maze test with 9 d of high fat feeding, with respiratory uncoupling in skeletal muscle mitochondria, associated with increased uncoupling protein (UCP3) levels. Our results suggest that high fat feeding, even over short periods of time, alters skeletal muscle UCP3 expression, affecting energy production and physical performance. Optimization of nutrition to maximize the efficiency of mitochondrial ATP production could improve energetics in athletes and patients with metabolic abnormalities. Murray, A. J. Knight, N. S. Cochlin, L. E. McAleese, S. Deacon, R. M. J. Rawlins, J. N. P. Clarke, K. Deterioration of physical performance and cognitive function in rats with short term high fat feeding. FASEB J. 23, 4353 4360 (2009) www.fasebj.org
FASEB journal official publication of the Federation of American Societies for Experimental Biology