Effect of voluntary hypocapnic hyperventilation or moderate hypoxia on metabolic and heart rate responses during high-intensity intermittent exercise
| Autor: | Yosuke Sasaki, Kohei Dobashi, Naoto Fujii, Takeshi Nishiyasu, Tomomi Fujimoto, Bun Tsuji, Satoru Tanigawa, Kazuhito Watanabe |
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| Rok vydání: | 2017 |
| Předmět: |
Male
Physiology 030204 cardiovascular system & hematology High-Intensity Interval Training 03 medical and health sciences Young Adult 0302 clinical medicine Oxygen Consumption Hypocapnia Altitude training Heart Rate Physiology (medical) Hyperventilation Heart rate Medicine Humans Orthopedics and Sports Medicine Hypoxia Muscle Skeletal Wingate test business.industry Public Health Environmental and Occupational Health 030229 sport sciences General Medicine Hypoxia (medical) medicine.disease Bicycling Respiratory alkalosis Anesthesia medicine.symptom business Anaerobic exercise |
| Zdroj: | European journal of applied physiology. 117(8) |
| ISSN: | 1439-6327 |
| Popis: | To investigate the effect of voluntary hypocapnic hyperventilation or moderate hypoxia on metabolic and heart rate responses during high-intensity intermittent exercise. Ten males performed three 30-s bouts of high-intensity cycling [Ex1 and Ex2: constant-workload at 80% of the power output in the Wingate anaerobic test (WAnT), Ex3: WAnT] interspaced with 4-min recovery periods under normoxic (Control), hypocapnic or hypoxic (2500 m) conditions. Hypocapnia was developed through voluntary hyperventilation for 20 min prior to Ex1 and during each recovery period. End-tidal CO2 pressure was lower before each exercise in the hypocapnia than control trials. Oxygen uptake ( $$\dot{V}{\text{O}}_{ 2}$$ ) was lower in the hypocapnia than control trials (822 ± 235 vs. 1645 ± 245 mL min−1; mean ± SD) during Ex1, but not Ex2 or Ex3, without a between-trial difference in the power output during the exercises. Heart rates (HRs) during Ex1 (127 ± 8 vs. 142 ± 10 beats min−1) and subsequent post-exercise recovery periods were lower in the hypocapnia than control trials, without differences during or after Ex2, except at 4 min into the second recovery period. $$\dot{V}{\text{O}}_{ 2}$$ did not differ between the control and hypoxia trials throughout. These results suggest that during three 30-s bouts of high-intensity intermittent cycling, (1) hypocapnia reduces the aerobic metabolic rate with a compensatory increase in the anaerobic metabolic rate during the first but not subsequent exercises; (2) HRs during the exercise and post-exercise recovery periods are lowered by hypocapnia, but this effect is diminished with repeated exercise bouts, and (3) moderate hypoxia (2500 m) does not affect the metabolic response during exercise. |
| Databáze: | OpenAIRE |
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