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Asian J Kinesiol > Volume 17(1); 2015 > Article
The Official Journal of the Korean Academy of Kinesiology 2015;17(1):29-38.
DOI: https://doi.org/10.15758/jkak.2015.17.1.29    Published online February 28, 2015.
Effects of Exercise Intensity and Duration on Fat Oxidation Rate during Exercise and Recovery in College Students.
Sung-Sik Ko
Korea National University of Transportation
Correspondence:  Sung-Sik Ko,
Email: koss@ut.ac.kr
Received: 3 November 2014   • Accepted: 14 February 2015
The purpose of this study was to compare metabolic variables during exercise and recovery between mid and low intensity exercise in college students.
Eight healthy university students were participated in two trials: (1) mid intensity exercise(60%VO 2 R, 45min; MI), and (2) low intensity exercise(40%VO 2 R, 60min; LI) in same energy expenditure condition on a treadmill exercise.
During the exercise, VO 2 and exercise expenditure(EE) were significantly higher at MI than at LI (p=.000, p=.000), but no significant difference of exercise time was found. Respiratory exchanged ratio(RER) was significantly higher at MI than at LI(p=010), and was significantly higher in exercise 15min than in exercise 30 and 45min(p=000). Fat oxidation rate(FOR) and Fat oxidation (g/min, FO) were significantly lower at MI than at LI(p=.022, p=.034), and were significantly higher at 15min than exercise at 30 and 45min(p=000, p=.000), respectively. During the recovery, VO 2 and EE were significantly higher at MI than at LI(p=.000, p=.000), and were significantly higher after 30min than after 15min of recovery(p=.000, p=.000), respectively. RER was not significantly different between MI and LI, but it was significantly lower after 45min than 15min recovery(p=.000). FOR and FO were not significant difference between MI and LI, but it was significantly higher after 30min than 15min recovery(p=.000, p=.000), respectively.
These finding suggest that the moderate exercise can contribute to greater exercise and recovery-induced fat oxidation and energy expenditure compared with a lower intensity continuous exercise.
Keywords: exercise intensity, fat oxidation, metabolism, oxygen uptake, excess post-exercise oxygen consumption


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