Six high-intensity interval training sessions over 5 days increases maximal oxygen uptake, endurance capacity, and sub-maximal exercise fat oxidation as much as 6 high-intensity interval training sessions over 2 weeks

Journal article


Atakan, Muhammed M., Güzel, Yasemin, Bulut, Süleyman, Koşar, Şükran N., McConell, Glenn K. and Turnagöl, Hüseyin H.. (2021). Six high-intensity interval training sessions over 5 days increases maximal oxygen uptake, endurance capacity, and sub-maximal exercise fat oxidation as much as 6 high-intensity interval training sessions over 2 weeks. Journal of Sport and Health Science. 10(4), pp. 478-487. https://doi.org/10.1016/j.jshs.2020.06.008
AuthorsAtakan, Muhammed M., Güzel, Yasemin, Bulut, Süleyman, Koşar, Şükran N., McConell, Glenn K. and Turnagöl, Hüseyin H.
Abstract

Background
High-intensity interval training (HIIT) induces similar or even superior adaptations compared to continuous endurance training. Indeed, just 6 HIIT sessions over 2 weeks significantly improves maximal oxygen uptake (VO2max), submaximal exercise fat oxidation, and endurance performance. Whether even faster adaptations can be achieved with HIIT is not known. Thus, we aimed to determine whether 2 sessions of HIIT per day, separated by 3 h, every other day for 5 days (double HIIT (HIIT-D), n = 15) could increase VO2max, submaximal exercise fat oxidation, and endurance capacity as effectively as 6 sessions of HIIT over 2 weeks (single HIIT (HIIT-S), n = 13).

Methods
Each training session consisted of 10 × 60 s of cycling at 100% of VO2max interspersed with 75 s of low-intensity cycling at 60 watt (W). Pre- and post-training assessments included VO2max, time to exhaustion at ∼80% of VO2max, and 60-min cycling trials at ∼67% of VO2max.

Results
Similar increases (p < 0.05) in VO2max (HIIT-D: 7.7% vs. HIIT-S: 6.0%, p > 0.05) and endurance capacity (HIIT-D: 80.1% vs. HIIT-S: 79.2%, p > 0.05) were observed. Submaximal exercise carbohydrate oxidation was reduced in the 2 groups after exercise training (HIIT-D: 9.2%, p = 0.014 vs. HIIT-S: 18.8%, p = 0.012) while submaximal exercise fat oxidation was significantly increased in HIIT-D (15.5%, p = 0.048) but not in HIIT-S (9.3%, p = 0.290).

Conclusion
Six HIIT sessions over 5 days was as effective in increasing VO2max and endurance capacity and was more effective in improving submaximal exercise fat oxidation than 6 HIIT sessions over 2 weeks.

Keywordsdouble interval training; exercise metabolism; performance; substrate oxidation
Year2021
JournalJournal of Sport and Health Science
Journal citation10 (4), pp. 478-487
PublisherElsevier BV
ISSN2213-2961
Digital Object Identifier (DOI)https://doi.org/10.1016/j.jshs.2020.06.008
PubMed ID32565243
Scopus EID2-s2.0-85058205393
PubMed Central IDPMC8343121
Open accessPublished as ‘gold’ (paid) open access
Research or scholarlyResearch
Page range478-487
Publisher's version
License
File Access Level
Open
Output statusPublished
Publication dates
Online18 Jun 2020
Publication process dates
Accepted16 May 2020
Deposited23 Nov 2021
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