There are many theories regarding why we grunt when we lift heavy objects. The most popular is that when we grunt, we activate the autonomic nervous system. It is responsible for controlling the body’s flight or fight response. It also releases the adrenaline rush in these scenarios. This helps the muscle contractions be more complete and more forceful, bringing in increase in force. When we push air out forcefully, the brain transmits a signal to the muscle group in question that decides muscular action. The end result is the ‘oomph’ factor that makes us exert ourselves more forcefully.
Why do we make grunting noises when we lift heavy things?
