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Sport Sciences for Health

, Volume 14, Issue 1, pp 71–76 | Cite as

Acute downhill running does not induce fat oxidation

  • Shaea A. Alkahtani
Original Article

Abstract

Objectives

Eccentric exercise has been suggested for its potential to increase several health outcomes, including exercise-induced fat oxidation. Comparison of exercise intensity rather than exercise workload is required.

Methods

Thirteen moderately active young men (mean age, 24.6 ± 5.6 years; body mass index, 23.76 ± 3.24 kg/m2; maximal oxygen consumption (VO2max), 49.00 ± 3.19 ml/kg/min) performed two counterbalanced running sessions for 40 min at 60% VO2max, either running flat (Con-Exe) or running downhill at a gradient of − 12% (Ecc-Exe). The volumes of oxygen and carbon dioxide (VO2 and VCO2) were collected during exercise sessions, and fat oxidation was calculated.

Results

There was no significant interaction between exercise condition and exercise duration (p > 0.05), and individual variations in fat oxidation during Con-Exe and Ecc-Exe were large and inconsistent.

Conclusion

Downhill running at 60% VO2max and inclination of − 12% does not induce fat oxidation.

Keywords

Substrate oxidation Eccentric exercise Muscle contraction Respiratory exchange ratio 

Notes

Acknowledgements

This is a research project that was supported by a grant from the research center for the sports science and physical activity, deanship of scientific research at King Saud University. The author thanks all participants, the Cardiovascular Laboratory and all research assistants, particularly Mr. Abdullah Al-Qawati.

Compliance with ethical standards

Conflict of interest

There is no conflict of interest to be disclosed.

Informed consent

Participants who expressed their interest in the study were asked to sign informed consent before commencing the study.

Ethical statement

The study procedure was approved by the Institutional Review Board at King Saud University (IRB No. E-16-1831).

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Copyright information

© Springer-Verlag Italia S.r.l. 2017

Authors and Affiliations

  1. 1.Department of Exercise Physiology, College of Sport Sciences and Physical ActivityKing Saud UniversityRiyadhSaudi Arabia

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