用力呼吸

用力呼吸 ( Forced respiration )：Forced respiration : respiration during exercise or inhalation of CO2 is called forced respiration。

用力呼吸時吸氣、呼氣均為主動過程：

吸氣時吸氣肌收縮活動加強、輔助吸氣肌也參與；

呼氣時吸氣肌舒張、還有呼氣肌參與。