Im notsure about those figures but alpha and gamma brain patterns are at play.

Chimps can use all of their strength all the time (Gamma I think), however they never slow down and think like we do.

Whereas humans are almost always in Alpha brain mode. The opposite of other Apes. So when we switch modes we get the heroc stories of a mom lifting a car to save a trapped child and the like. Some feats of athleticism and strength are only attainable when the brain switches off those self preservation mechanisms.

I worked with small apes and they would frequently attack the leather gloves with such ferocity their teeth would fall out. They hardly seemed to notice if at all and certainly did not seem to care.

I dont remember the name of the study