轻、中度体力负荷下外加呼吸阻力对呼吸型式的影响

The Effects of Added Breathing Resistance on Respiratory Pattern During Mild and Moderate Exercise

以6名健康男性青年为被试者,在静坐及轻、中度(250,500kgm·min^(-1)体力负荷下,以0.28～1.62kPa·L^(-1)·s的吸气阻力(IR)范围测出的5个辨别阈(JND)梯级为感觉单位,并以各JND梯级所对应的IR值及与2、4 JND等感的不同匹配的联合阻力(CR)值为物理刺激量,分别测出呼吸气体流率及心率变化。结果表明:在静坐及轻、中度运动条件下,IR负荷对呼吸型式影响的趋势基本一致;施加CR时,静坐与轻度运动的呼吸型式变化大体相似,而中度运动其变化更加明显;心率只随体力负荷强度而增加,阻力负荷对其无明显影响。

In six healthy male subjects, the changes of respiratory airflow rate and heart rate were determined in sensory units of five just noticeable difference (JND) steps caused by inspiratory resistive loads (IR) ranging 0.28-1.62 kPa·L-1·s and physical stimuli in IR corresponding to every JND steps and combined resistance (CR) of different ratios equivalent to 2, 4 JND sensation at rest and during mild and moderate muscular exercise (250 and 500 kg·m·min-1) performed on a bicycle ergometer. The results suggest that (1) the tendency of effects on respiratory pattern, within the test range of IR loads, are approximately consistent at rest and during mild and moderate exercise; (3) when giving CR, the changes of respiratory pattern at rest and during mild exercise are similar, but more apparently during moderate exercise; (3) the heart rate raised only as the exertion level is increased, but are not influenced by resistive loads apparently.