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Research Article
Protective buttressing of the human fist and the evolution of hominin hands
Michael H. Morgan, David R. Carrier
Journal of Experimental Biology 2013 216: 236-244; doi: 10.1242/jeb.075713
Michael H. Morgan
1The University of Utah School of Medicine, 30 N. 1900 E., Salt Lake City, UT 84132, USA
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David R. Carrier
2Department of Biology, University of Utah, 257 S. 1400 E., Salt Lake City, UT 84112, USA
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  • For correspondence: carrier@biology.utah.edu
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SUMMARY

The derived proportions of the human hand may provide supportive buttressing that protects the hand from injury when striking with a fist. Flexion of digits 2–5 results in buttressing of the pads of the distal phalanges against the central palm and the palmar pads of the proximal phalanges. Additionally, adduction of the thenar eminence to abut the dorsal surface of the distal phalanges of digits 2 and 3 locks these digits into a solid configuration that may allow a transfer of energy through the thenar eminence to the wrist. To test the hypothesis of a performance advantage, we measured: (1) the forces and rate of change of acceleration (jerk) from maximum effort strikes of subjects striking with a fist and an open hand; (2) the static stiffness of the second metacarpo-phalangeal (MCP) joint in buttressed and unbuttressed fist postures; and (3) static force transfer from digits 2 and 3 to digit 1 also in buttressed and unbuttressed fist postures. We found that peak forces, force impulses and peak jerk did not differ between the closed fist and open palm strikes. However, the structure of the human fist provides buttressing that increases the stiffness of the second MCP joint by fourfold and, as a result of force transfer through the thenar eminence, more than doubles the ability of the proximal phalanges to transmit ‘punching’ force. Thus, the proportions of the human hand provide a performance advantage when striking with a fist. We propose that the derived proportions of hominin hands reflect, in part, sexual selection to improve fighting performance.

FOOTNOTES

  • FUNDING

    This research was supported by a grant from The National Science Foundation [IOS-0817782 to D.R.C.].

  • © 2013.
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Keywords

  • Male–male competition
  • Fighting
  • Great ape
  • Hominidae

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Research Article
Protective buttressing of the human fist and the evolution of hominin hands
Michael H. Morgan, David R. Carrier
Journal of Experimental Biology 2013 216: 236-244; doi: 10.1242/jeb.075713
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Research Article
Protective buttressing of the human fist and the evolution of hominin hands
Michael H. Morgan, David R. Carrier
Journal of Experimental Biology 2013 216: 236-244; doi: 10.1242/jeb.075713

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