QUANTIFICATION OF SUBSTRATE METABOLISM DURING 5 KM AND 20KM RACES

Paper ID : 1226-SPORTCONGRESS

Authors

Farahnaz Amirshaghaghi * Faculty

Abstract

ABSTRACT Introduction: Fat and carbohydrate are important fuels for aerobic exercise and there can be reciprocal shifts in the proportions of carbohydrate and fat that are oxidized. The the exercise intensity and duration can affect the interaction between carbohydrate and fatty acid oxidation. Therefire, we investigated the quantification of substrate metabolism during 5 km and 20 km races. Methods and Results: 6 male runners (age (years): 23.5 ± 2.9, weight (kg): 70.9 ± 4.5, and hieght (cm): 176 ± 5.6) volunteered to take part in the study. In a counter-balanced crossover design, each participant completed 5k and 20k trials separated by ≥1 wk. All participant completed each trials at maximum of their capacity. At the beginning and following the interventions blood samples were collected and analyzed. Total carbohydrate and fat oxidation rates (g/min) were calculated by using the stoichiometric equations of Jeukendrup and Wallis. The result of study indicated that 5 km running showed a higher absolute CHO than the first 5 km of longer(20 Km) running. Moreover, participants when performed 5 km running showed reduction of fat utilization compared to the firs 5 km of 20 km. There was a significant difference between pre-race and post-race of glycerol, lactate, glucose and NEFA in both 5 km and 20 km (p≤0.05). Conclusions: Our data highlight how the interplay between exercise intensity, and training duration can modulate the substrate utilization during exercise. In addition to informing future research design methodology, our data may be of practical significance in helping to formulate CHO and lipid requirements in relation to specific types of training sessions

Keywords

Anerobic Exercise,,Carbohydrate, Lipid ,, Metabolis

Status: Abstract Accepted (Poster Presentation)