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
中科院分区:
文献类型:
--
作者:
Olin JT;Dimmen AC;Subudhi AW;Roach RC
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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