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Nutrient preferences and appetite responses to high- and low-intensity intermittent exercise in obese men
Poster Abstracts Each participant completed four exercise tests: (1) a maximal incremental exercise test for the determination of VO2max and ventilatory threshold (VT), (2) a discontinuous incremental exercise test with 4-min stages for the determination of MFOint, (3) a 60-min constant load exercise bout at 80%VT, and (4) a 60-min constant load bout at MFOint. Whole body fat oxidation was calculated from respiratory gases measured throughout each test. The maximal rate of fat oxidation derived from the discontinuous test was 0.36 ± 0.13 g/min. This corresponded to an intensity of 129 ± 35 W (51 ± 7%VO2max ), which was significantly lower than the intensity at 80%VT (174 ± 48 W; 59 ± 7%VO2max , P < 0.0001). Average HR and VO2 were higher (P < 0.0001), and respiratory exchange ratio (RER) was lower (P = 0.006) in the 80%VT bout compared with MFOint. [BLa] remained stable across each of the bouts, but was significantly higher in the 80%VT bout than the MFOint bout (4.00 ± 0.20 mmol/L and 2.30 ± 0.13 mmol/L, respectively; P = 0.001). Total energy expenditure over 60 min was significantly greater in the 80%VT bout (664 ± 180 kcal) than the MFOint bout (511 ± 134 kcal; P < 0.0001). Fat oxidation increased significantly over the 60 min at both intensities (P < 0.0001). Average fat oxidation (MFOint: 0.34 ± 0.10 vs. 80%VT: 0.30 ± 0.10 g/min), and therefore total fat oxidised (MFOint: 20.4 ± 5.9 g vs. 80%VT: 18.1 ± 5.8 g), was similar between intensities. The main finding was that fat oxidation was similar during 60-min exercise bouts performed at MFOint and 80%VT. Given that both intensities were well-tolerated, it is preferable to exercise at 80%VT to maximise energy expenditure.
S5 obese males (mean age = 29 y (range 24—38); mean BMI = 29.1 kg/m2 (range 25.5—35); mean %fat mass 31.7 (range 25.7—35.3) completed three exercise sessions: an initial graded exercise test, and two intermittent cycling sessions: low-intensity (LI) and high-intensity (HI) sessions on separate days in random order. The LI session involved 5-min repetitions of workloads 20% below and then 20% above the FAT-max intensity. The HI session consisted of cycling for alternate bouts of 15 s at 85% VO2max and 15 s unloaded recovery. Appetite sensations and food preferences were measured immediately before and after the exercise sessions using computer-based Visual Analogue Scale (VAS) and the Liking and Wanting (L&W) experimental procedure 1. The L&W method assesses explicit liking and wanting, relative frequency of choice and implicit wanting. The mean work loads, intensities and durations for the HI and LI exercise sessions were 80.7 ± 11.1 W and 48 ± 0.02% VO2max for 17.5 ± 3.9 min, and 49.6 ± 12.5 W and 34 ± 0.05% VO2max for 30 min, respectively. There was a significant effect of time on explicit liking and wanting regarding the taste (p ≤ 0.001) and fat content (p < 0.001) of food. Relative frequency of choice revealed that the HI exercise session significantly increased the preference for high-fat foods (p < 0.001), but no effect on taste. Implicit wanting decreased in all food categories after both LI and HI — the mean decrease was significantly lower after LI (p < 0.001). There were no effects of time or intensity on appetite sensations but thirst increased. In conclusion, manipulating the intensity of acute intermittent exercise did not affect appetite, but did affect acute food preferences.
doi:10.1016/j.orcp.2010.09.009 P09 Nutrient preferences and appetite responses to high- and low-intensity intermittent exercise in obese men S.A. Alkahtani ∗ , A.P. Hills, N.M. Byrne, N.A. King School of Human Movement Studies, Institute of Health and Biomedical Innovation, Queensland University of Technology, Australia Intermittent exercise has been suggested as an alternative method of weight management to traditional continuous exercise. The effect of intermittent exercise on appetite and food preference has received less attention. This study investigated the influence of different intensities of intermittent exercise on food preferences and appetite sensations in obese men. Twelve
doi:10.1016/j.orcp.2010.09.010 P10 N-3 enrichment of a high saturated fat diet ameliorates hepatic fat accretion through pathways that limit fat storage and lipogenesis L.K. Philp 1,∗ , A. Janovska 1 , G. Hatzinikolas 1 , L. Heilbronn 1 , G. Mayrhofer 2 , G.A. Wittert 1 1 Disciplines
of Medicine, University of Adelaide, Australia 2 Microbiology and Immunology, University of Adelaide, Australia High saturated fatty acid (FA) diets (HF-S) are associated with insulin resistance and increased cardiometabolic risk. Partial replacement of saturated fat with n−3 FAs (HF-n−3) may be protective, but the mechanisms remain unclear.
S5 obese males (mean age = 29 y (range 24—38); mean BMI = 29.1 kg/m2 (range 25.5—35); mean %fat mass 31.7 (range 25.7—35.3) completed three exercise sessions: an initial graded exercise test, and two intermittent cycling sessions: low-intensity (LI) and high-intensity (HI) sessions on separate days in random order. The LI session involved 5-min repetitions of workloads 20% below and then 20% above the FAT-max intensity. The HI session consisted of cycling for alternate bouts of 15 s at 85% VO2max and 15 s unloaded recovery. Appetite sensations and food preferences were measured immediately before and after the exercise sessions using computer-based Visual Analogue Scale (VAS) and the Liking and Wanting (L&W) experimental procedure 1. The L&W method assesses explicit liking and wanting, relative frequency of choice and implicit wanting. The mean work loads, intensities and durations for the HI and LI exercise sessions were 80.7 ± 11.1 W and 48 ± 0.02% VO2max for 17.5 ± 3.9 min, and 49.6 ± 12.5 W and 34 ± 0.05% VO2max for 30 min, respectively. There was a significant effect of time on explicit liking and wanting regarding the taste (p ≤ 0.001) and fat content (p < 0.001) of food. Relative frequency of choice revealed that the HI exercise session significantly increased the preference for high-fat foods (p < 0.001), but no effect on taste. Implicit wanting decreased in all food categories after both LI and HI — the mean decrease was significantly lower after LI (p < 0.001). There were no effects of time or intensity on appetite sensations but thirst increased. In conclusion, manipulating the intensity of acute intermittent exercise did not affect appetite, but did affect acute food preferences.
doi:10.1016/j.orcp.2010.09.009 P09 Nutrient preferences and appetite responses to high- and low-intensity intermittent exercise in obese men S.A. Alkahtani ∗ , A.P. Hills, N.M. Byrne, N.A. King School of Human Movement Studies, Institute of Health and Biomedical Innovation, Queensland University of Technology, Australia Intermittent exercise has been suggested as an alternative method of weight management to traditional continuous exercise. The effect of intermittent exercise on appetite and food preference has received less attention. This study investigated the influence of different intensities of intermittent exercise on food preferences and appetite sensations in obese men. Twelve
doi:10.1016/j.orcp.2010.09.010 P10 N-3 enrichment of a high saturated fat diet ameliorates hepatic fat accretion through pathways that limit fat storage and lipogenesis L.K. Philp 1,∗ , A. Janovska 1 , G. Hatzinikolas 1 , L. Heilbronn 1 , G. Mayrhofer 2 , G.A. Wittert 1 1 Disciplines
of Medicine, University of Adelaide, Australia 2 Microbiology and Immunology, University of Adelaide, Australia High saturated fatty acid (FA) diets (HF-S) are associated with insulin resistance and increased cardiometabolic risk. Partial replacement of saturated fat with n−3 FAs (HF-n−3) may be protective, but the mechanisms remain unclear.