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Effect of interval training intensity on fat oxidation, blood lactate and the rate of perceived exertion in obese men


Alkahtani, SA and King, NA and Hills, AP and Byrne, NM, Effect of interval training intensity on fat oxidation, blood lactate and the rate of perceived exertion in obese men, SpringerPlus, 2 pp. 532. ISSN 2193-1801 (2013) [Refereed Article]


Copyright Statement

Copyright 2013 Alkahtani et al. Licensed under Creative Commons Attribution 2.0 Generic (CC BY 2.0)

DOI: doi:10.1186/2193-1801-2-532


Purpose: The objectives of this study were to examine the effect of 4-week moderate- and high-intensity interval training (MIIT and HIIT) on fat oxidation and the responses of blood lactate (BLa) and rating of perceived exertion (RPE).

Methods: Ten overweight/obese men (age = 29 3.7 years, BMI = 30.7 3.4 kg/m2) participated in a cross-over study of 4-week MIIT and HIIT training. The MIIT training sessions consisted of 5-min cycling stages at mechanical workloads 20% above and 20% below 45%VO2peak. The HIIT sessions consisted of intervals of 30-s work at 90%VO2peak and 30-s rest. Pre- and post-training assessments included VO2max using a graded exercise test (GXT) and fat oxidation using a 45-min constant-load test at 45%VO2max. BLa and RPE were also measured during the constant-load exercise test.

Results: There were no significant changes in body composition with either intervention. There were significant increases in fat oxidation after MIIT and HIIT (p ≤ 0.01), with no effect of intensity. BLa during the constant-load exercise test significantly decreased after MIIT and HIIT (p ≤ 0.01), and the difference between MIIT and HIIT was not significant (p = 0.09). RPE significantly decreased after HIIT greater than MIIT (p ≤ 0.05).

Conclusion: Interval training can increase fat oxidation with no effect of exercise intensity, but BLa and RPE decreased after HIIT to greater extent than MIIT.

Item Details

Item Type:Refereed Article
Research Division:Health Sciences
Research Group:Sports science and exercise
Research Field:Exercise physiology
Objective Division:Health
Objective Group:Specific population health (excl. Indigenous health)
Objective Field:Men's health
UTAS Author:Hills, AP (Professor Andrew Hills)
UTAS Author:Byrne, NM (Professor Nuala Byrne)
ID Code:109691
Year Published:2013
Web of Science® Times Cited:39
Deposited By:Health Sciences
Deposited On:2016-06-28
Last Modified:2017-10-31
Downloads:159 View Download Statistics

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