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

Shaea A. Alkahtani, Neil A. King, Andrew P. Hills, Nuala M. Byrne

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19 Citations (Scopus)

Abstract

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 constantload 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.

Original languageEnglish
Pages (from-to)1-10
Number of pages10
JournalSpringerPlus
Volume2
Issue number1
DOIs
Publication statusPublished - 2013
Externally publishedYes

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Lactic Acid
Fats
Exercise Test
Body Composition
Workload
Cross-Over Studies
Exercise

Cite this

Alkahtani, Shaea A. ; King, Neil A. ; Hills, Andrew P. ; Byrne, Nuala M. / Effect of interval training intensity on fat oxidation, blood lactate and the rate of perceived exertion in obese men. In: SpringerPlus. 2013 ; Vol. 2, No. 1. pp. 1-10.
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Effect of interval training intensity on fat oxidation, blood lactate and the rate of perceived exertion in obese men. / Alkahtani, Shaea A.; King, Neil A.; Hills, Andrew P.; Byrne, Nuala M.

In: SpringerPlus, Vol. 2, No. 1, 2013, p. 1-10.

Research output: Contribution to journalArticleResearchpeer-review

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