Medicine & Science in Sports & Exercise:
May 2006 - Volume 38 - Issue 5 - p S483
Friday Afternoon Poster Presentations: Posters displayed from 1:00-6:00 p.m.: One-hour author presentation times are staggered from 2:00-3:00 p.m., 3:00-4:00 p.m., and 4:00-5:00 p.m.: F-27 Free Communication/Poster - Diet or Exercise and Chronic Disease Risk: FRIDAY, JUNE 2, 2006 2:00 PM - 5:00 PM: ROOM: Hall B
Triaclyglycerol concentrations [TAG] are lower after consumption of meals high in monounsaturated fat than after meals high in saturated fat. Prior exercise is also effective in lowering postprandial [TAG]. Thus, the optimal strategy for reducing postprandial [TAG] may be to exercise regularly and to consume monounsaturated rather than saturated fats.
PURPOSE: To examine the combined effects of exercise and fat composition on postprandial [TAG].
METHODS: Five healthy females (age 26.0 ± 3.7 y, ht 1.63 ± 0.04 m, body mass 56.2 ± 5.1 kg, mean ± SD) completed four, 2-d trials in randomised order: olive oil-exercise, butter-exercise, olive oil-no exercise, butter-no exercise. Each trial was conducted during the follicular phase of the menstrual cycle under standardized dietary conditions. For the exercise trials participants walked/ran on a treadmill for 60 min at 60% of maximum oxygen uptake on the afternoon of day 1. On the no-exercise trials participants rested on day 1. On the morning of day 2 participants reported to the lab after an overnight fast. A cannula was inserted into an antecubital vein and a baseline blood sample was taken. Participants then consumed a test meal comprising 55% fat, 39% carbohydrate, 6% protein and 65kJ per kg body mass. The fat in this meal was supplied from either olive oil (saturated fat 15%, unsaturated fat 85%) or butter (saturated fat 71%, unsaturated fat 29%). Further blood samples were obtained at hourly intervals for 6 h for the determination of plasma [TAG].
RESULTS: Six-hour area under the curve values for plasma [TAG] did not differ significantly between trials (one-way ANOVA, P < 0.37).
Nevertheless, there was a trend for lower values on the olive oil-exercise trial (Figure).
Figure. No caption a...Image Tools
CONCLUSION: These initial data from an ongoing study reveal no difference in plasma [TAG] following manipulation of diet and exercise. However, the trend for lower plasma [TAG] on the exercise-olive oil intervention suggests that further study is warranted.
Figure: Six-hour area under the curve values for plasma [TAG] over time (mean ± SEM).