A Sister can completely control her breathing and heart rate to the degree that she can appear dead to most tests even after intense physical exertion.

Heat cramps tend to occur after intense exertion.

As usual my sister sounded as though she'd just completed some event requiring intense exertion.

His chest heaved with the intense exertion of the past few moments.

Ten years of intense and scrupulous exertion have paid off.

His efforts, and the intense exertions of the drummer Ali Jackson, made the arrangement feel sharper than it did the first time around.

Chirox's voice was smooth and calm, not at all reflecting the intense exertion of the exercise.

He sighed, as if relaxing after some intense exertion.

Among the factors known to start erratic beating of an affected heart are swimming, intense physical exertion or being suddenly startled or frightened.

For Cavor that was a time of intense exertion; for me it was an anxious inactivity.