Abstract
OBJECTIVE: To investigate the in vivo effect of exercise training at high and low intensity on β-adrenergic stimulated fat metabolism in obese men at rest.
METHOD: Twenty-three obese, healthy subjects were randomly divided in a low-intensity exercise training program (40% VO2max, n=7), a high-intensity exercise training program (70% VO2max; n=8), or a non-exercising control group (n=8). The exercise training program lasted for 12 weeks with a training frequency of 3 times per week. Before and after the intervention body composition and maximal aerobic capacity were measured as well as fat metabolism at rest and during β-adrenergic stimulation by isoprenaline. For comparison, six lean subjects served as a control group. They participated in a low-intensity exercise training program and underwent the same measurements as the obese subjects.
RESULTS: Relative fat oxidation decreased significantly during infusion of an increasing dose of isoprenaline in the obese low-intensity and high-intensity exercise training groups as well as in the lean group (P<0.01). Exercise training failed to influence the effect of β-adrenergic stimulation on relative fat oxidation in obese men at both intensities and in lean men. In addition, β-adrenergic-mediated lipolysis did not seem to be different after low intensity exercise training in lean and obese men. Lipolysis might be increased after high-intensity exercise training in obese men.
CONCLUSION: Low- and high-intensity exercise training in obese men failed to affect β-adrenergic mediated relative fat oxidation in vivo. β-Adrenergic-mediated lipolysis might be increased in obese men after HI exercise training only. The effect of low-intensity exercise training on β-adrenergic-mediated fat metabolism was similar in lean and obese men.
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Acknowledgements
The authors wish to thank Jos Stegen and Joan Senden for analytical assistance and Judith Graat and Vanessa Blokdijk for assistance during the experiments. Furthermore we thank Lode BV (Groningen, The Netherlands) for providing electromagnetically braked cycles. This work was supported by a grant from the Netherlands Heart Foundation (no. 95040).
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van Aggel-Leijssen, D., Saris, W., Homan, M. et al. The effect of exercise training on β-adrenergic stimulation of fat metabolism in obese men. Int J Obes 25, 16–23 (2001). https://doi.org/10.1038/sj.ijo.0801470
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DOI: https://doi.org/10.1038/sj.ijo.0801470
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