Abstract
Purpose
Increased capacity for fat oxidation (FatOx) is demonstrated in response to chronic endurance training as well as high-intensity interval training (HIIT). This study examined changes in maximal fat oxidation (MFO) in response to 20 sessions of periodized HIIT in an attempt to identify if various regimes of HIIT similarly augment capacity for FatOx.
Methods
Thirty-nine habitually active men and women (mean age and VO2max = 22.5 ± 4.4 year and 40.0 ± 5.6 mL/kg/min) completed training and 32 men and women with similar physical activity and fitness level served as non-exercising controls (CON). Training consisted of ten sessions of progressive low-volume HIIT on the cycle ergometer after which participants completed an additional ten sessions of sprint interval training (SIT), high-volume HIIT, or periodized HIIT, whose assignment was randomized. Before and throughout training, MFO, FatOx, and carbohydrate oxidation (CHOOx) were assessed during progressive cycling to exhaustion.
Results
Compared to CON, there was no effect of HIIT on MFO (p = 0.11). Small increases (p = 0.03) in FatOx were evident in response to HIIT leading to an additional 4.3 g of fat oxidized, although this value may not be clinically meaningful.
Conclusions
Our results refute the widely reported increases in capacity for FatOx demonstrated with HIIT, which is likely due to marked day-to-day variability in determinations of MFO and exercise fat oxidation as well as the heterogeneity of our sample.
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Abbreviations
- ANOVA:
-
Analysis of variance
- CHO:
-
Carbohydrate
- CHOOx:
-
Carbohydrate oxidation
- Fatmin:
-
Minimum fat oxidation
- FatOx:
-
Fat oxidation
- FFM:
-
Fat free mass
- HIIT:
-
High-intensity interval training
- HRmax:
-
Maximal heart rate
- MFO:
-
Maximal fat oxidation
- PPO:
-
Peak power output
- RER:
-
Respiratory exchange ratio
- SIT:
-
Sprint interval training
- VO2max:
-
Maximal oxygen uptake
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Acknowledgements
The authors thank the participants for their dedication to the study as well as Samantha Namm, Anthony Fischer, Kimi Wood, Kayla Snow, Matt Montell, Johnnie Durbin, Ramon Contreras, Susy Damian, Sarah Offenbecher, and Jordan Ridings for assistance with data collection.
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Communicated by William J. Kraemer.
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Astorino, T.A., Edmunds, R.M., Clark, A. et al. Change in maximal fat oxidation in response to different regimes of periodized high-intensity interval training (HIIT). Eur J Appl Physiol 117, 745–755 (2017). https://doi.org/10.1007/s00421-017-3535-y
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DOI: https://doi.org/10.1007/s00421-017-3535-y