Pulmonary kinetics at the onset of exercise is faster when actual changes in alveolar O₂ stores are considered

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• 作者：A. Aliverti ; B. Kayser ; M. Cautero ; R.L. Dellacà ; P.E. di Prampero ; C. Capelli
• 关键词：BbB O₂ consumption ; Opto-electronic plethysmography ; me=""mml20"">method=retrieve&_udi=B6X16-4X378F9-1&_mathId=mml20&_user=10&_cdi=7234&_pii=S1569904809002444&_rdoc=13&_issn=15699048
• 刊名：Respiratory Physiology & Neurobiology
• 出版年：2009
• 出版时间：31 October 2009
• 年：2009
• 卷：169
• 期：1
• 页码：78-82
• 全文大小：385 K

文摘

Breath-by-breath (BbB) oxygen uptake rate was measured at the mouth (MO) and at the alveolar level, at the onset of square wave cycling exercise of moderate intensity in six healthy male subjects. Alveolar BbB values were calculated correcting MO values by (i) estimating (GR); and (ii) measuring (opto-electronic plethysmography, OEP) BbB lung O₂ store changes. kinetics was then described by a bi-exponential model. GR yielded larger values of the time constants (τ₂) of the primary phase of kinetics. The mean response times (MRTs) calculated by analysing GR BbB values were larger than (i) those obtained by using MO and OEP at 90 W; and (ii) that by using MO at 120 W. OEP corrected yielded the highest normalised amplitude of the cardiodynamic phase of the on-response. Correction of BbB for actual BbB changes of lung O₂ stores by OEP thus seems more appropriate for the study of the early cardiodynamic phase of kinetics than GR.