Prieur F, Benoit H, Busso T, Castells J, Geyssant A, Denis C
Laboratoire d'Analyse Multidisciplinaire des Pratiques Sportives, UFR STAPS, Université d'Artois, Chemin du Marquage, 62800 Liévin, France.
Eur J Appl Physiol. 2002 Dec;88(3):235-42. doi: 10.1007/s00421-002-0707-0. Epub 2002 Oct 2.
The present study examined the effect of hyperoxia on oxygen uptake (VO(2)) and on maximal oxygen uptake (VO(2max)) during incremental exercise (IE) and constant work rate exercise (CWRE). Ten subjects performed IE on a bicycle ergometer under normoxic and hyperoxic conditions (30% oxygen). They also performed four 12-min bouts of CWRE at 40, 55, 70 and 85% of normoxic VO(2max) (ex1, ex2, ex3 and ex4, respectively) in normoxia and in hyperoxia. VO(2max) was significantly improved by 15.0 (15.2)% under hyperoxia, while performance (maximum workload, W(max)) was improved by only +4.5 (3.0)%. During IE, the slope of the linear regression relating VO(2) to work rate was significantly steeper in hyperoxia than in normoxia [10.80 (0.88) vs 10.06 (0.66) ml x min(-1) x W(-1)]. During CWRE, we found a higher VO(2) at ex1, ex2, ex3 and ex4, and a higher VO(2) slow component at ex4 under hyperoxia. We have shown that breathing hyperoxic gas increases VO(2max), but to an extent that is difficult to explain by an increase in oxygen supply alone. Changes in metabolic response, fibre type recruitment and VO(2) of non-exercising tissue could explain the additional VO(2) for a given submaximal work rate under hyperoxia.
本研究考察了高氧对递增运动（IE）和恒定工作率运动（CWRE）期间摄氧量（VO₂）和最大摄氧量（VO₂max）的影响。10名受试者在常氧和高氧条件（30%氧气）下在自行车测力计上进行递增运动。他们还在常氧和高氧条件下，分别以常氧VO₂max的40%、55%、70%和85%进行了4次12分钟的恒定工作率运动（分别为ex1、ex2、ex3和ex4）。高氧条件下VO₂max显著提高了15.0（15.2）%，而运动表现（最大工作量，Wmax）仅提高了+4.5（3.0）%。在递增运动期间，高氧条件下VO₂与工作率的线性回归斜率显著陡于常氧条件下[10.80（0.88）对10.06（0.66）ml·min⁻¹·W⁻¹]。在恒定工作率运动期间，我们发现在高氧条件下，ex1、ex2、ex3和ex4时的VO₂更高，且ex4时的VO₂慢成分更高。我们已经表明，呼吸高氧气体可增加VO₂max，但增加的程度难以仅用氧气供应增加来解释。代谢反应、纤维类型募集以及非运动组织VO₂的变化可以解释在高氧条件下给定次最大工作率时额外的VO₂。
