Advertisement

Relationship between isocapnic buffering and maximal aerobic capacity in athletes

  • Yoshitake Oshima
  • Tadayoshi Miyamoto
  • Shigehiro Tanaka
  • Tsuyoshi Wadazumi
  • Naotsugu Kurihara
  • Shigeo Fujimoto
ORIGINAL ARTICLE

Abstract

This study was performed to clarify the relationship between isocapnic buffering and maximal aerobic capacity (O2 max ) in athletes. A group of 15 trained athletes aged 21.1 (SD 2.6) years was studied. Incremental treadmill exercise was performed using a modified version of Bruce's protocol for determination of the anaerobic threshold (AT) and the respiratory compensation point (RC). Ventilatory and gas exchange responses were measured with an aeromonitor and expressed per unit of body mass. Heart rate and ratings of perceived exertion were recorded continuously during exercise. The mean O2 max , oxygen uptake (O2) at AT and RC were 58.2 (SD 5.8) ml · kg−1 · min−1, 28.0 (SD 3.3) ml · kg−1 · min−1 and 52.4 (SD 6.7) ml · kg−1 · min−1, respectively. The mean values of AT and RC, expressed as percentages of O2 max , were 48.3 (SD 4.2)% and 90.0 (SD 5.2)%, respectively. The mean range of isocapnic buffering defined as O2 between AT and RC was 24.4 (SD 4.5) ml · kg−1 · min−1, and the mean range of hypocapnic hyperventilation (HHV) defined as O2 between RC and the end of exercise was 5.8 (SD 3.0) ml · kg−1 · min−1. The O2 max per unit mass was significantly correlated with AT (r = 0.683, P < 0.01). In addition, O2 max /mass was closely correlated with both the range of isocapnic buffering (r = 0.803, P < 0.001) and RC (r = 0.878, P < 0.001). However, no correlation was found between O2 max per unit mass and the range of HHV (r = 0.011, NS.). These findings would suggest that the prominence of isocapnic buffering, in addition to the anaerobic threshold, may have been related to O2 max of the athletes. The precise mechanisms underlying this proposed relationship remain to be elucidated.

Key words Maximal oxygen uptake Isocapnic buffering Anaerobic threshold Respiratory compensation 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Copyright information

© Springer-Verlag Berlin Heidelberg 1997

Authors and Affiliations

  • Yoshitake Oshima
    • 1
  • Tadayoshi Miyamoto
    • 1
  • Shigehiro Tanaka
    • 1
  • Tsuyoshi Wadazumi
    • 1
  • Naotsugu Kurihara
    • 2
  • Shigeo Fujimoto
    • 1
  1. 1.Institute of Health Science and Physical Education, Osaka City University, 3-3-138, Sugimoto, Sumiyoshi-ku Osaka, 558 JapanJP
  2. 2.Osaka Railway Hospital of West Japan Railway Company, Osaka, JapanJP

Personalised recommendations