Mallios V J, Hodgson J L
Noll Laboratory for Human Performance Research, Pennsylvania State University, University Park 16802.
Eur J Appl Physiol Occup Physiol. 1994;69(3):262-7. doi: 10.1007/BF01094799.
Previous studies have shown the existence of an ideal respiratory rate (fR) for a given ventilation at which the respiratory work rate (J.s-1) is minimum. The purpose of the present study was to measure the effect of fR, tidal volume and breathing pattern on the respiratory work per breath and respiratory work rate during exercise on a cycle ergometer. Three work rates on the cycle ergometer were used and at each work rate the ventilation was kept constant. Two different breathing patterns were applied at each ventilation. Nine male trained cyclists [mean (SD) maximum oxygen consumption, 57 (5.47) ml.kg-1.min-1] participated in this study. The results indicated that there was a significant difference in the respiratory work per breath, with different breathing patterns at a given ventilation and for all levels of ventilation. There was no significant difference in the respiratory work rate with different breathing patterns at a given ventilation and for all levels of ventilation. In addition, the respiratory work per breath and respiratory work rate were increased with increasing ventilation. Thus, the data indicated that the manipulation of tidal volume, respiratory rate and breathing pattern had no significant effect on the energy cost of breathing for a given ventilation. The absence of this significant effect on respiratory work rate was observed across a range of ventilation from 24 to 72 l.min-1. These findings suggest that the breathing pattern is predominantly an expression of the function of the higher respiratory brain center instead of energy economy, at least within this range of ventilation.
先前的研究表明，对于给定的通气量存在一个理想呼吸频率（fR），在此呼吸频率下呼吸功（J·s⁻¹）最小。本研究的目的是测量在自行车测力计上运动期间，呼吸频率、潮气量和呼吸模式对每一次呼吸的呼吸功及呼吸功率的影响。使用了自行车测力计上的三种运动强度，并且在每种运动强度下通气量保持恒定。在每种通气量下应用两种不同的呼吸模式。九名受过训练的男性自行车运动员[平均（标准差）最大耗氧量，57（5.47）ml·kg⁻¹·min⁻¹]参与了本研究。结果表明，在给定通气量以及所有通气水平下，不同呼吸模式下每一次呼吸的呼吸功存在显著差异。在给定通气量以及所有通气水平下，不同呼吸模式的呼吸功率没有显著差异。此外，每一次呼吸的呼吸功和呼吸功率随着通气量增加而增加。因此，数据表明，对于给定通气量，潮气量、呼吸频率和呼吸模式的操控对呼吸能量消耗没有显著影响。在24至72 l·min⁻¹的通气范围内均观察到对呼吸功率没有这种显著影响。这些发现表明，至少在这个通气范围内，呼吸模式主要是高级呼吸脑中枢功能的一种表现，而非能量经济性的表现。
