The shape of the fist is effective and protects the hand when striking
To investigate this hypothesis, the researchers literally carried out relevant experiments. They asked subjects to take blows on a special punching bag equipped with sensors. In addition, the researchers systematically examined the effects of a punch on the individual parts of the hand.
The Carrier and Morgan scores showed that a fist is the most effective blow compared to other hand postures. At the same time it is well cushioned by the impact of the blow against the joints and limbs of the hand, so there is less risk of injury. In a typical fist, the fingertips rest on the upper part of the palm, and the thumb presses on the middle links of the finger bones to the ring finger. In the case of a blow, the pressure which acts on the finger bones is passed on to the palm of the hand, and the thumb additionally supports from the outside. A monkey's hand can not take this position, but the proportions of the human hand seem to have been created for this purpose, say Carrier and Morgan. display
From an evolutionary point of view, therefore, there is a plausible picture: human ancestors who could deal hard fists without risking the risk of a hand injury had advantages. They were able to prevail in the fight for resources or partners. "Man is a being whose natural behavior includes aggression and violence, " say the scientists. In addition to design features, this side of man is reflected in his hands, Carrier and Morgan are convinced.David Carrier and Michael Morgan of the University of Utah: Journal of Experimental Biology, doi: 10.1242 / j eb.075713 © wissenschaft.de - Martin Vieweg