While competing in the Olympic trials,marathoner Kirsten O'Brien suffered a stress fracture in her left leg. That she did not experience significant pain until the race was over is probably attributable to the fact that during the race

Question

Quizplus · Accepted Answer

During intense physical activity, the brain can send signals that effectively close the "pain gate" in the spinal cord, preventing pain signals from reaching the brain. This is likely why Kirsten O'Brien didn't feel significant pain until after the race was over.

While Competing in the Olympic Trials,marathoner Kirsten O'Brien Suffered a Stress