As he did so, Gillian's heart sped instead of slowing down.

Again her heart sped, but this time without any risk of an attack.

His heart sped so swiftly that he thought he would die of fear.

Even when the poles bent under the heavy load, his light heart sped him along.

His heart sped a little at the mischief he read in her.

Her heart speeded, even at the travesty he made of himself.

The baby's heart had slowed and was not speeding back up.

Their hearts are not speeding up and slowing down at a normal pace.

He could slow his heart beat to four a minute or speed it to 108 a minute, all without moving from this spot.

His heart sped again, for a different reason.