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. 2008 Aug 7;586(Pt 18):4559–4565. doi: 10.1113/jphysiol.2008.159350

Figure 1. Saline contrast echocardiograms from a 36-year-old male subject (no. 6) during normoxic Inline graphic and hyperoxic Inline graphic exercise at 180 W Inline graphic.

Figure 1

A, echocardiogram during normoxic exercise for 1 min at 180 W. Note saline contrast bubbles in the left heart indicating arteriovenous shunting. Bubble score = 3. B, echocardiogram during hyperoxic exercise for 120 s at 180 W. Note absence of saline contrast bubbles in the left heart indicating no arteriovenous shunting. Bubble score = 1. C, echocardiogram upon returning to normoxic exercise for 60 s at 180 W. Note appearance of saline contrast bubbles in the left heart recommenced indicating arteriovenous shunting. Bubble score = 3.