She tried to slow her breathing and get herself under control.

Still, he had to make an effort to slow his breathing.

She sat and made an effort to slow her breathing.

Once again, when they came near he slowed his breathing.

He stood in the path, trying to slow his breathing.

Large amounts, however, can slow breathing and might cause death.

He tried to slow his breathing to keep from making noise.

Slow your breathing, and shut out all else as you have been taught to do.

Too frightened to move, she just stood there, trying to slow her breathing.

Children may be more sensitive to the effects of the drug, especially slowed breathing.