Yitzchak Ginsburgh recommends breathing to the Shema in a counting tempo of 8,4,6,5. This corresponds to Chevdah=Joy. Breathing in Joy. Count to 8 as you breath in, count to 4 (as you hold that breath), count to 6 (as you exhale), count to 5 (as you neither breathe or exhale). Count quick to 8 (inhaling on Shema), Count 4 (holding on Israel), Count 6 (exhaling on Adonai Eloheinu), Count 5 (as you rest on Adonaia Echad).