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Christine M. Tallon, Ryan G. Simair, Alyssa V. Koziol, Philip N. Ainslie and Alison M. McManus

indexed using middle cerebral artery (MCA) mean blood velocity (MCA V ), was ∼12% in children, in comparison with ∼25% in adults. The peak increase in MCA V in children occurred at 50% of the ventilatory threshold and was maintained up to and including the respiratory compensation point. Absolute values

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Guohua Zheng, Xin Zheng, Junzhe Li, Tingjin Duan, Kun Ling, Jing Tao and Lidian Chen

]/end diastolic velocity) of the bilateral vertebral artery, bilateral middle cerebral artery, bilateral anterior cerebral artery, bilateral posterior cerebral artery, and the basilar artery, as measured by a color Doppler ultrasound imaging device (product type: IU22; Philips, Netherlands). The secondary