What can result from holding your breath while lifting weights?

Holding your breath while lifting weights can lead to increased chest cavity pressure, which occurs as the thoracic cavity is compressed during the isometric contraction of the diaphragm and chest muscles. This technique, known as the Valsalva maneuver, can temporarily boost intra-abdominal and thoracic pressure, potentially aiding in stabilization and supporting heavy lifts. However, while this may support lifting heavier weights momentarily, it can also lead to adverse effects like dizziness or fainting due to reduced blood flow to the brain and changes in blood pressure.

In contrast, the other options do not accurately reflect the physiological response of breath-holding during lifting. Increased blood flow to the brain is unlikely due to the pressure buildup, and improved muscle endurance and enhanced weightlifting performance can occur for various reasons but are not direct results of breath-holding.