title: Differential effects of dietary intake of palmitic acid and oleic acid on oxygen consumption during and after exercise.
abstract: Our previous studies suggest that diets varying in palmitic acid (PA) and oleic acid (OA) content may affect energy expenditure and fat oxidation differentially. We hypothesized that, compared with a high-OA diet, a high-PA diet would lead to lower oxygen consumption during exercise and lower excess postexercise oxygen consumption (EPOC). Adults were randomized to 1 of 2 liquid diets (28 days): HI PA (fat, 40% of energy; PA, 16.8%; OA, 16.4%) (n = 10) or HI OA (fat, 40%; PA, 1.7%; OA, 31.4%) (n = 9). On day 29, the rates of oxygen consumption (V o(2)) and carbon dioxide production were measured during and for 270 minutes after 80 minutes of cycling (60% V o(2 peak)). There was no group difference (HI OA vs HI PA, mean +/- SEM) in fat-free mass (53.8 +/- 4.7 vs 56.9 +/- 3.0 kg), V o(2 peak) (40.7 +/- 2.3 vs 36.6 +/- 3.2 mL/kg per minute), and work during exercise (101 +/- 12 vs 101 +/- 10 W). V o(2) (L/min) during exercise (1.99 +/- 0.22 vs 1.85 +/- 0.19) was significantly different (P = .05) only when corrected for fat-free mass, with which it significantly correlated (r = 0.86; P < .001). During 60 to 270 minutes postexercise, the average EPOC was 9.7% +/- 4.9% of preexercise V o(2) in OA, whereas there was no EPOC present in PA (P = .06 between diets). In conclusion, a high-PA diet appears to lower V o(2) during and after exercise compared with a high-OA diet.
authors.affiliation: Department of Surgery, University of Texas Medical Branch, Galveston, USA.
authors.forename: Elisabet
authors.initials: E
authors.lastname: Børsheim
authors.forename: C Lawrence
authors.initials: CL
authors.lastname: Kien
authors.forename: William M
authors.initials: WM
authors.lastname: Pearl
mesh_terms: D000293:Adolescent; D000328:Adult; D001823:Body Composition; D002245:Carbon Dioxide / Q000378:metabolism; D004032:Diet; D015444:Exercise; D005260:Female; D006801:Humans; D007700:Kinetics; D008297:Male; D019301:Oleic Acid / Q000008:administration & dosage* / Q000494:pharmacology; D010101:Oxygen Consumption / Q000187:drug effects*; D019308:Palmitic Acid / Q000008:administration & dosage* / Q000494:pharmacology
chemical_list: D002245:Carbon Dioxide; D019301:Oleic Acid; D019308:Palmitic Acid