Cerebral blood flow and oxygenation at maximal exercise: the effect of clamping carbon dioxide.

Cerebral blood flow and oxygenation at maximal exercise: the effect of clamping carbon dioxide.
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DOI:
10.1016/j.resp.2010.09.011
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发表时间:
2011-01-31
影响因子:
2.3
通讯作者:
Roach RC
Roach RC
中科院分区:
医学4区
文献类型:
--
作者:
Olin JT;Dimmen AC;Subudhi AW;Roach RC

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运动时,随着潮末二氧化碳(PETCO2)在呼吸代偿点(RCP)后下降,脑血流速度(CBFv)和脑氧合也随之下降。这种低流量、低氧化状态可能会限制工作能力。我们假设,通过新设计的高流量、低阻力再呼吸回路防止峰值工作能力(Wmax)时PETCO2的下降,我们将改善CBFv、脑氧合和Wmax。10名骑自行车的人在RCP后进行了两次增量运动测试,一次作为对照,另一次是PETCO2恒定(夹住)。我们分析了PETCO2、大脑中动脉CBFv、脑氧合和心肺指标。在Wmax时,当我们夹持PETCO2(39.7±5.2 vs 29.6±4.7 mmHg, P<0.001)时,CBFv增加(92.6±15.9 vs 73.6±12.5 cm/s, P<0.001)。然而,脑氧合保持不变(ΔTSI -21.3±13.1% vs -24.3±8.1%,P=0.33), Wmax降低(380.9±20.4 vs 405.7±26.8 Watts, P<0.001)。在Wmax,箝位PETCO2增加CBFv,但这似乎没有提高Wmax。
During exercise, as end-tidal carbon dioxide (PETCO2) drops after the respiratory compensation point (RCP), so does cerebral blood flow velocity (CBFv) and cerebral oxygenation. This low-flow, low-oxygenation state may limit work capacity. We hypothesized that by preventing the fall in PETCO2 at peak work capacity (Wmax) with a newly-designed high-flow, low-resistance rebreathing circuit, we would improve CBFv, cerebral oxygenation, and Wmax. Ten cyclists performed two incremental exercise tests, one as control and one with PETCO2 constant (clamped) after the RCP. We analyzed PETCO2, middle cerebral artery CBFv, cerebral oxygenation, and cardiopulmonary measures. At Wmax, when we clamped PETCO2 (39.7 ± 5.2 vs. 29.6 ± 4.7 mmHg, P<0.001), CBFv increased (92.6 ± 15.9 vs. 73.6 ± 12.5 cm/s, P<0.001). However, cerebral oxygenation was unchanged (ΔTSI -21.3 ± 13.1% vs. -24.3 ± 8.1%, P=0.33), and Wmax decreased (380.9 ± 20.4 vs. 405.7 ± 26.8 Watts, P<0.001). At Wmax, clamping PETCO2 increases CBFv, but this does not appear to improve Wmax.
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