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. 2021 Sep 24;14:675–681. doi: 10.2147/IMCRJ.S317404

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© 2021 Bjertnaes et al.

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Average blood velocity in right radial artery (A) and heart rate (B) vs time of a test person during steady state ergometer cycling. Arrows indicate start and stop of a period of apnea and facial immersion (AFI) in ice-cold water.