The Effect Exercise Intensity and Duration Has On Substrate Oxidation in Upper
Cardiff Metropolitan University
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Purpose: The purpose of this study was to determine the optimum intensity and duration to oxidise free fatty acids (FFA) during upper body arm ergometry over a 30-min exercise bout. Method: The sample population for this investigation included 5 voluntary, physically active and able-bodied male participants who were recruited from Cardiff School of Sport. The testing was carried out at Cardiff Metropolitan University physiology lab. The participants were required to attend three separate sessions, one week apart. They carried out the test seated using an electronically braked arm ergometer. On the first visit maximal oxygen consumption (VO₂max) was assessed using a graded exercise test with 20 Watt power increments every 2-min until the point of fatigue or exhaustion. The following sessions consisted of a prolonged 30-min steady-state exercise bout at 40 and 50% VO₂max. RER, VO₂ and VCO₂ values were collected from the gas analysis system at 2-min intervals throughout the 30-min duration to assess the influence exercise duration and intensity had on fat oxidation and to determine maximal fat oxidation (Fatmax). A one-way repeated measure ANOVA was used to determine significant differences in the energy derived from fat (kJ) during exercise duration, the different exercise intensities and interaction between the two. Results: Fat oxidation (kJ.min) increased during 0-30min and the data trend indicated a positive correlation between fat oxidation and exercise duration. This was deemed to be statistically significant (p<0.05). The data suggested that 50%VO₂max was the more efficient intensity for greater fat oxidation to occur. However there was no statistical significance found between the two intensities and interaction between intensity and duration (p>0.05). Results also suggested that over the 30-min carbohydrate (CHO) oxidation decreased over exercise duration. Conclusion: The general trend drawn from the results of this study indicate that there is a significant difference between fat oxidation 0- 30min. The findings suggest that populations looking to partake in upper body aerobic exercise should look to exercise for >20-min at a 50%VO₂max intensity in order to elicit optimal fat oxidation, no significance however was found between the two intensities.
DEGREE OF BACHELOR OF SCIENCE (HONOURS) SPORT AND EXERCISE SCIENCE
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