Overnight fasting compromises exercise intensity and volume during sprint interval training but improves high-intensity aerobic endurance
| Autor: | Yilina Liubaoerjijin, Normand G. Boulé, Kevin Fletcher, Étienne Myette-Côté, Tasuku Terada, Saeed Reza Toghi Eshghi, Michael D. Kennedy |
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| Rok vydání: | 2019 |
| Předmět: |
Adult
Male Anaerobic Threshold business.industry Physical Therapy Sports Therapy and Rehabilitation Fasting High-Intensity Interval Training Interval training Bicycling Animal science Sprint Physical Endurance Exercise intensity Humans Aerobic exercise Medicine Orthopedics and Sports Medicine Exercise physiology business Exercise human activities High-intensity interval training Anaerobic exercise Aerobic capacity |
| Zdroj: | The Journal of Sports Medicine and Physical Fitness. 59 |
| ISSN: | 1827-1928 0022-4707 |
| Popis: | 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 (SIT-CHO) and SIT following overnight fast (SIT-Fast) on aerobic capacity (peak oxygen consumption: VO2peak) and high-intensity aerobic endurance (time-to-exhaustion at 85% VO2peak [T85%]). Methods Twenty male cyclists were randomized to SIT-CHO and SIT-Fast. 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 SIT-CHO group performed exercise sessions following breakfast and consumed carbohydrate drink during exercise, whereas the SIT-Fast group performed exercise sessions following overnight fast and consumed water during exercise. Before and after training, VO2peak 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 SIT-Fast than SIT-CHO (3664.9 vs. 3871.7 J/kg; P=0.021 and 10.6 vs. 9.9 W/kg; P=0.010, respectively). Post-training VO2peak did not differ between groups. Baseline-adjusted post-training T85% was longer in SIT-Fast compared to SIT-CHO (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 SIT-Fast compromises exercise intensity and volume but still can have a greater impact on the ability to sustain high-intensity aerobic endurance exercise compared to SIT-CHO. |
| Databáze: | OpenAIRE |
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