Respiratory Responses to Hypoxia and Hypercapnia in the Athletes
【Supercategory：7. DESCENTE SPORTS SCIENCE Subcategory：7.3 Vol.3】
Regulation of ventilation was studied by measuring hypoxic and hypercapnic ventilatory responses in 52 judo athletes and 43 middle-long distance runners with 22 non-athletes as a control.
Hypoxic ventilatory response was measured by a progressive hypoxia method. In the judo athletes and long distance runners, the averaged values of parameter A (l・min⁻¹・mmHg), an index of hypoxic sensitivity, were 295 (Light, middle and light heavy weight class), 458 (Heavy weight class of non-obesity body type), 1155 (Heavy weight class of obesity body type) and 485 (Long distance runners), respectively. Hypercapnic ventilatory response was measured by Read's rebreathing method. In the judo athletes, the mean values of the slope S (l・min⁻¹・mmHg⁻¹), an index of CO₂ sensitivity, were 1.53 (Light, middle and light heavy weight class), 1.90 (Heavy weight class of non-obesity body type), 1.77 (Heavy weight class of obesity body type) and 1.48 (non-athletes), respectively.
On the other hand, the mean slope of the distance runners were 1.28 (Middle distance runners), 1.38 (3000m S.C. runners), 1.55 (Long distance runners) and 2.26 (Walkers), respectively.
In the judo athletes, both hypoxic and hypercapnic ventilatory responses were significantly related to the body weight. In the obesity group of judo athletes, marked augmentation of hypoxic sensitivity was particularly noted in the present investigation.
DESCENTE SPORTS SCIENCE Vol.3/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE
Hypoxic ventilatory response was measured by a progressive hypoxia method. In the judo athletes and long distance runners, the averaged values of parameter A (l・min⁻¹・mmHg), an index of hypoxic sensitivity, were 295 (Light, middle and light heavy weight class), 458 (Heavy weight class of non-obesity body type), 1155 (Heavy weight class of obesity body type) and 485 (Long distance runners), respectively. Hypercapnic ventilatory response was measured by Read's rebreathing method. In the judo athletes, the mean values of the slope S (l・min⁻¹・mmHg⁻¹), an index of CO₂ sensitivity, were 1.53 (Light, middle and light heavy weight class), 1.90 (Heavy weight class of non-obesity body type), 1.77 (Heavy weight class of obesity body type) and 1.48 (non-athletes), respectively.
On the other hand, the mean slope of the distance runners were 1.28 (Middle distance runners), 1.38 (3000m S.C. runners), 1.55 (Long distance runners) and 2.26 (Walkers), respectively.
In the judo athletes, both hypoxic and hypercapnic ventilatory responses were significantly related to the body weight. In the obesity group of judo athletes, marked augmentation of hypoxic sensitivity was particularly noted in the present investigation.
DESCENTE SPORTS SCIENCE Vol.3/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE
| Researcher | Yoshiyuki Honda*1, Akio Yoshida*1, Fumiaki Hayashi*1, Yoshio Masuda*1, Yoshio Oyabu*2, Nobuyuki Sato*3, Akio Usami*2 |
|---|---|
| University or institution | *1 Chiba University, *2 Kogakuin University, *3 Tokai University |
Keywords
hypoxic, hypercapnic ventilatory responses, judo, middle-long distance runners, index of hypoxic sensitivity, index of CO2 sensitivity