Division of Physiotherapy, The University of Queensland, Brisbane, Queensland, Australia.
Physiother Theory Pract. 2010 Aug;26(6):385-92. doi: 10.3109/09593980903423210.
This study investigated the effect of flow rates and spirometer type on chest wall motion in healthy individuals. Twenty-one healthy volunteers completed breathing trials to either two times tidal volume (2xV(T)) or inspiratory capacity (IC) at high, low, or natural flow rates, using a volume- or flow-oriented spirometer. The proportions of rib cage movement to tidal volume (%RC/V(T)), chest wall diameters, and perceived level of exertion (RPE) were compared. Low and natural flow rates resulted in significantly lower %RC/V(T) compared to high flow rate trials (p=0.001) at 2xV(T). Low flow trials also resulted in significantly less chest wall motion in the upper anteroposterior direction than high and natural flow rates (p<0.001). At IC, significantly greater movement occurred in the abdominal lateral direction during low flow compared to high and natural flow trials (both p<0.003). RPE was lower for the low flow trials compared to high flow trials at IC and 2xV(T) (p<0.01). In healthy individuals, inspiratory flow (not device type) during incentive spirometry determines the resultant breathing pattern. High flow rates result in greater chest wall motion than low flow rates.
这项研究调查了流量和肺活量计类型对健康个体胸壁运动的影响。21 名健康志愿者使用容积或流量导向的肺活量计，以高、低或自然流量完成两次潮气容积（2xV(T))或吸气量（IC）的呼吸试验。比较了肋骨运动占潮气容积的比例（%RC/V(T)）、胸壁直径和感知的用力程度（RPE）。与高流量试验相比，低流量和自然流量导致 2xV(T)时的%RC/V(T)显著降低（p=0.001）。低流量试验还导致上前后方向的胸壁运动明显小于高流量和自然流量（均 p<0.001）。在 IC 时，与高流量和自然流量试验相比，低流量时腹外侧方向的运动明显更大（均 p<0.003）。与高流量试验相比，低流量试验时 IC 和 2xV(T)的 RPE 更低（p<0.01）。在健康个体中，激励性肺活量计吸气时的流量（而非设备类型）决定了呼吸模式的结果。高流量导致比低流量更大的胸壁运动。
