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THE JOURNAL OF SPORTS MEDICINE AND PHYSICAL FITNESS

Rivista di Medicina, Traumatologia e Psicologia dello Sport


Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
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The Journal of Sports Medicine and Physical Fitness 2018 Apr 04

DOI: 10.23736/S0022-4707.18.08281-6

Copyright © 2018 EDIZIONI MINERVA MEDICA

lingua: Inglese

Overnight fasting compromises exercise intensity and volume during sprint interval training but improves high-intensity aerobic endurance

Tasuku TERADA 1, Saeed R. TOGHI ESHGHI 2, Yilina LIUBAOERJIJIN 2, Michael KENNEDY 2, Etienne MYETTE-CÔTÉ 3, Kevin FLETCHER 2, Normand G. BOULÉ 2

1 Faculty of Rehabilitation Medicine, Department of Occupational Therapy, University of Alberta, Edmonton, Canada; 2 Faculty of Physical Education and Recreation, 1-02 Li Ka Shing Centre for Health Research Innovation, Edmonton, Canada; 3 School of Health and Exercise Sciences, University of British Columbia Okanagan, Kelowna, Canada


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BACKGROUND: The combined effects of sprint interval training (SIT) and exercising in the fasted state are unknown. We compared the effects of SIT with exogenous carbohydrate supplementation (SITCHO) and SIT following overnight fast (SITFast) on aerobic capacity (peak oxygen consumption: V̇ O2peak) and high-intensity aerobic endurance (time-to-exhaustion at 85% V̇ O2peak [T85%]).
METHODS: Twenty male cyclists were randomized to SITCHO and SITFast. Both groups performed 30-second all-out cycling followed by 4-minute active recovery 3 times per week for 4 weeks, with the number of sprint bouts progressing from 4 to 7. Peak power output (PPO) and total mechanical work were measured for each sprint interval bout. The SITCHO group performed exercise sessions following breakfast and consumed carbohydrate drink during exercise, whereas the SITFast group performed exercise sessions following overnight fast and consumed water during exercise. Before and after training, V̇ O2peak and T85% were assessed. Blood glucose, non-esterified fatty acids, insulin and glucagon concentrations were measured during T85%.
RESULTS: Overall PPO and mechanical work were lower in SITFast than SITCHO (3664.9 vs. 3871.7 Joules/kg; p=0.021 and 10.6 vs. 9.9 Watts/kg; p=0.010, respectively). Post- training V̇ O2peak did not differ between groups. Baseline-adjusted post-training T85% was longer in SITFast compared to SITCHO (19.7 ± 3.0 vs. 16.6 ± 3.0 minutes, ANCOVA p=0.038) despite no changes in circulating energy substrates or hormones.
CONCLUSIONS: Our results suggest that SITFast compromises exercise intensity and volume but still can have a greater impact on the ability to sustain high-intensity aerobic endurance exercise compared to SITCHO.


KEY WORDS: Exercise - Aerobic power - Submaximal performance - Wingate - Time to fatigue - Carbohydrate supplementation

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Publication History

Article first published online: April 04, 2018
Manuscript accepted: March 9, 2018
Manuscript revised: February 12, 2018
Manuscript received: October 15, 2017

Per citare questo articolo

Terada T, Toghi Eshghi SR, Liubaoerjijin Y, Kennedy M, Myette-Côté E, Fletcher K, et al. Overnight fasting compromises exercise intensity and volume during sprint interval training but improves high-intensity aerobic endurance. J Sports Med Phys Fitness 2018 Apr 04. DOI: 10.23736/S0022-4707.18.08281-6

Corresponding author e-mail

nboule@ualberta.ca