運動時通氣動力與呼吸反應的關係

Respiratoy Changes in Relation to Ventilatory Power during Exercise

衛沛文(Pui-Man Wai Jackson)

《體育學報》 19期 (1995/08) Pp. 133-144

https://doi.org/10.6222/pej.0019.199508.1712

摘要

本研究測量8名自由車運動員（年齡=23±1.6歲（平均數±標準誤），最大攝氧量=59±1.1ml•kg^(-1)•min^(-1)）於漸進負荷自由車運動時的通氣動力，以探求影響其增加的因素。食道内壓和其他心肺數據由一套自設的每次呼吸電腦系統測量。結果顯示潮氣量和吸氣期平均食道内壓於較高運動強度時的增加趨於極限，這些呼吸模式的調整似乎與呼吸機械、吸氣肌疲勞和呼吸辛苦感有關。通氣動力的增加與呼吸率和呼氣期平均食道內壓有直接的相關。由於主動呼氣促進呼吸率的增加，故呼氣肌收縮是通氣動力有較高增加的主要推動力。

並列摘要

Ventilatory power was measured in eight male cyclists (23.1±1.6 (mean±SE) years of age, 59.0±1.1 ml.kg^(-1)•min^(-1) of maximum oxygen uptake) during incremental cycling to evaluate factors contributing to its incrcase. Esophageal pressure and cardiorespiratory variables were obtained using a custom-made breath-by-breath computer data acquisition system. The results showed that tidal volume and mean inspiratory esophageal pressure approached limits during higher exercise intensity. This respiratory pattern changes appeared to be associated with respiratory mechanics, inspiratory muscle fatigue, and the respiratory effort sensation. Ventilatory power increased indirect proportion to respiratory frequency and mean expiratory esophageal pressure, Since active expiration facilitated the increase of respiratory frequency, it was concluded that expiratory muscle contraction was the major drive of producing higher level of ventilatory power.