Oshima Y, Miyamoto T, Tanaka S, Wadazumi T, Kurihara N, Fujimoto S
Institute of Health Science and Physical Education, Osaka City University, Osaka, Japan.
Eur J Appl Physiol Occup Physiol. 1997;76(5):409-14. doi: 10.1007/s004210050269.
This study was performed to clarify the relationship between isocapnic buffering and maximal aerobic capacity (VO2max) 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 VO2max, oxygen uptake (VO2) at AT and RC were 58.2 (SD 5.8) ml x kg(-1) x min(-1), 28.0 (SD 3.3) ml x kg(-1) x min(-1) and 52.4 (SD 6.7) ml x kg(-1) x min(-1), respectively. The mean values of AT and RC, expressed as percentages of VO2max, were 48.3 (SD 4.2)% and 90.0 (SD 5.2)%, respectively. The mean range of isocapnic buffering defined as VO2 between AT and RC was 24.4 (SD 4.5) ml x kg(-1) x min(-1), and the mean range of hypocapnic hyperventilation (HHV) defined as VO2 between RC and the end of exercise was 5.8 (SD 3.0) ml x kg(-1) x min(-1). The VO2max per unit mass was significantly correlated with AT (r = 0.683, P < 0.01). In addition, VO2max/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 VO2max 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 VO2max of the athletes. The precise mechanisms underlying this proposed relationship remain to be elucidated.
本研究旨在阐明运动员等碳酸缓冲与最大有氧能力（VO2max）之间的关系。对一组15名年龄为21.1（标准差2.6）岁的训练有素的运动员进行了研究。采用改良的布鲁斯方案进行递增式跑步机运动，以确定无氧阈（AT）和呼吸补偿点（RC）。使用气体监测仪测量通气和气体交换反应，并以每单位体重表示。运动过程中持续记录心率和主观用力程度评分。平均VO2max、AT和RC时的摄氧量（VO2）分别为58.2（标准差5.8）ml·kg-1·min-1、28.0（标准差3.3）ml·kg-1·min-1和52.4（标准差6.7）ml·kg-1·min-1。AT和RC的平均值，以VO2max的百分比表示，分别为48.3（标准差4.2）%和90.0（标准差5.2）%。定义为AT和RC之间VO2的等碳酸缓冲平均范围为24.4（标准差4.5）ml·kg-1·min-1，定义为RC与运动结束之间VO2的低碳酸过度通气（HHV）平均范围为5.8（标准差3.0）ml·kg-1·min-1。每单位质量的VO2max与AT显著相关（r = 0.683，P < 0.01）。此外，VO2max/质量与等碳酸缓冲范围（r = 0.803，P < 0.001）和RC（r = 0.878，P < 0.001）均密切相关。然而，未发现每单位质量的VO2max与HHV范围之间存在相关性（r = 0.011，无显著性差异）。这些发现表明，除无氧阈外，等碳酸缓冲的突出程度可能与运动员的VO2max有关。这种拟议关系背后的确切机制仍有待阐明。
