Sensation of breathlessness and respiratory oxygen cost during cycle exercise with and without conscious entrainment of the breathing rhythm
Sensation of breathlessness and respiratory oxygen cost during cycle exercise with and without conscious entrainment of the breathing rhythm
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在有或没有有意识地控制呼吸节律的情况下，循环运动期间的呼吸困难和呼吸耗氧量的感觉
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
H. Deguchi
中科院分区：
文献类型：
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作者：
N. Takano;H. Deguchi
摘要：据推测，有意识地将呼吸节律引入运动节律 (ENT) 可以减轻呼吸不适并减少通气的氧气 (O2) 成本，从而减少有节奏运动期间的总 O2 摄取量 (V˙O2)。这一假设已在此处报告的研究中得到检验。八名女性受试者在最大 V˙O2 的 40% 和 60% 两种工作负荷条件下以 50 rpm 的速度进行自行车运动。在每个工作负荷的 30 分钟锻炼期间，要求每个受试者在两种条件下呼吸，每次 15 分钟：（1）自发（非耳鼻喉科跑步），以及（2）有意将呼吸节律引入自行车节律，以两种节律的首选耦合比率（耳鼻喉科跑步）。在耳鼻喉科运行中，大多数受试者选择 1:2 的比例。在每次运行中，在 4-5 分钟测量肺通气量 (V˙E)、总 V˙O2 和呼吸困难感 (BS)。 BS 根据 Borg 类别量表进行评估。每 15 分钟运行中的剩余 10 分钟被分配用于测量通气的 O2 成本 (ΔV˙O2/ΔV˙E)，通过高碳酸血症引起的过度通气方法进行评估，其中呼吸肌的 V˙O2 (V˙O2RM) 是通过将 ΔV˙O2/ΔV˙E 乘以当前的 V˙E 来计算的。平均而言，在任何工作负载下执行的非 ENT 和 ENT 运行之间，任何变量 V˙O2、ΔV˙O2/ΔV˙E、V˙O2RM 和 BS 均没有显着差异。然而，两次运行之间的差异（Δ）在受试者之间存在很大差异，并且个别受试者的 ΔV˙O2 与 ΔV˙E、ΔV˙O2 与 ΔV˙O2RM 以及 Δ BS 与 ΔO2RM 之间存在显着相关性。这些结果表明，在耳鼻喉科期间 V˙O2RM 下降的受试者中，耳鼻喉科期间总 V˙O2 和 BS 可能会下降。
Abstract The conscious entrainment of respiratory rhythm to exercise rhythm (ENT) has been hypothesized to alleviate breathing discomfort and reduce the oxygen (O2) cost of ventilation with a resulting decrease in total O2 uptake (V˙O2) during rhythmic exercise. This hypothesis has been tested in the study reported here. Eight female subjects performed cycle exercise at 50 rpm under two work load conditions of 40% and 60% of maximal V˙O2. During a 30-min exercise period at each work load, each subject was asked to breathe under two conditions for 15 min each: (1) spontaneously (non-ENT run), and (2) deliberately entraining the breathing rhythm to the cycling rhythm at preferred coupling ratios of the two rhythms (ENT run). In the ENT run, most subjects chose a ratio of 1:2. In each run, pulmonary ventilation (V˙E), total V˙O2 and the breathlessness sensation (BS) were measured at 4–5 min. BS was assessed according to a Borg category scale. The remaining 10 min of each 15-min run were allotted for measurement of the O2 cost of ventilation (ΔV˙O2/ΔV˙E), assessed by a hypercapnia-induced hyperventilation method in which the V˙O2 of the respiratory muscles (V˙O2RM) was calculated by multiplying ΔV˙O2/ΔV˙E by the prevailing V˙E. On average, there were no significant differences in any of the variables, V˙O2,ΔV˙O2/ΔV˙E,V˙O2RM and BS, between the non-ENT and ENT runs performed at any work load. However, there were wide variations among the subjects in the differences (Δ) between the two runs, and significant correlations were found between ΔV˙O2 vs ΔV˙E, ΔV˙O2 vs ΔV˙O2RM, and Δ BS vs ΔO2RM of individual subjects. These results indicate that reductions of the total V˙O2 and BS with ENT could occur in subjects in whom the V˙O2RM decreased during ENT.