Exercise Adaptation of the Respiratory Control System by Low-Frequency Severe-Intensity Interval Training: a Longitudinal study
【Supercategory：7. DESCENTE SPORTS SCIENCE Subcategory：7.42 Vol.42】
ABSTRACT
The purpose of this study was to clarify the effects of weekly high-intensity interval training on the feedback control function of the respiratory chemoreflex feedback system and cardiac morphology. Seven healthy subjects were characterized separately for respiratory controller and plant（ subsystems） by changing inspiratory CO2 fraction and by changing minute ventilation （VE） at rest and during low and high-intensity exercise, respectively. HIIT affected VO2max （+ 9.5 ± 7.5%, p ＝ 0.008） and left ventricular posterior wall thickness （+ 17.9±8.6%, p ＝ 0.002）， and affected both subsystems during high-intensity exercise, but not at rest and during low-intensity exercise. During high-intensity exercise, downward shift of respiratory controller characteristics mainly attributed to lower VE after HIIT. In conclusion, weekly highintensity interval training attenuates respiratory drive during high-intensity exercise via desensitization of the respiratory controller, including left ventricular hypertrophy and maximal cardiorespiratory function.
DECENTE SPORTS SCIENCE Vol.42/The DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE
The purpose of this study was to clarify the effects of weekly high-intensity interval training on the feedback control function of the respiratory chemoreflex feedback system and cardiac morphology. Seven healthy subjects were characterized separately for respiratory controller and plant（ subsystems） by changing inspiratory CO2 fraction and by changing minute ventilation （VE） at rest and during low and high-intensity exercise, respectively. HIIT affected VO2max （+ 9.5 ± 7.5%, p ＝ 0.008） and left ventricular posterior wall thickness （+ 17.9±8.6%, p ＝ 0.002）， and affected both subsystems during high-intensity exercise, but not at rest and during low-intensity exercise. During high-intensity exercise, downward shift of respiratory controller characteristics mainly attributed to lower VE after HIIT. In conclusion, weekly highintensity interval training attenuates respiratory drive during high-intensity exercise via desensitization of the respiratory controller, including left ventricular hypertrophy and maximal cardiorespiratory function.
DECENTE SPORTS SCIENCE Vol.42/The DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE
| Researcher | *1 Tadayoshi Miyamoto, *1Hideomi Nakata, *1Shingo Otsuki, *1 Go Ito, *2 Hidehiro Nakahara |
|---|---|
| University or institution | Osaka Sangyo University*1, Morinomiya University of Medical Sciences*2 |
Keywords
interval training, exercise, maximal oxygen uptake, respiratory control, system analysis