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Energy Cost of Stone Knapping

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Abstract

Stone tool manufacture and use are considered key adaptations in human evolution. The understanding of the biomechanical features and anatomical constraints of hominins during stone tool production have received increased attention in recent years. Similarly, research on the cognitive capabilities and manipulative complexity involved in toolmaking is in progress. However, data on the palaeophysiological constraints of stone knapping are scarce. The balance between energy acquisition and energy expenditure is a key factor to determine the fitness of any individual, and stone knapping is essential for resource procurement in any Palaeolithic society. Thus, the combination of energetic analyses and experimental archaeology provides an excellent tool to improve our understanding of prehistoric behaviours. Here, we present experimental research on the energetics of stone tool production that involves nine experienced subjects. Each subject produced three handaxes through direct hard- and soft-hammer percussion in a total of 27 experiments of toolmaking. All knappers were described by their anthropometric data, and their energetic expenditure was monitored in a breath-by-breath indirect calorimetry procedure. Because knapping is considered a light-intensity level activity, based on its MET (Metabolic Equivalent Task of Intensity) value, our results show some differences in net energy expenditure between direct hard percussion and soft percussion knapping during the configuration of a handaxe. Furthermore, our results suggest that the brachial index of the subjects represents an anatomical constraint for stone knapping because the lever of a shorter forearm reduces energy expenditure during striking and represents an advantage during handaxe production. Differences in the energetic efficiency of knapping, even if they are low, may increase the general fitness of the individual and, indeed, its survival.

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Acknowledgements

We are deeply grateful to all the knappers who participated in this study: Raul López, David Canales, Iván de Pedro, Rodrigo Alcalde, Felipe Cuartero, Andreu Ollé, Josep Mª Vergès, and Juan Ignacio Morales. The experimental design was developed at the CENIEH LabBioEM, Bioenergy and Motion Laboratory of the National Research Center on Human Evolution (Burgos, Spain) and at the CAREX (Centro de Arqueología Experimental, Atapuerca, Burgos, Spain). Data were obtained from the EVOBREATH DataBase managed by A.Mateos and J. Rodríguez. The work of the CENIEH Palaeophysiology and Human Ecology Group is gratefully acknowledged. This research was funded by the National Research Center on Human Evolution (CENIEH). Two anonymous experts from Elsevier Language Editing Services edited the English of the manuscript. Finally, we appreciate the helpful comments and suggestions provided by the editor and the three anonymous reviewers which significantly enhanced the manuscript. This work is dedicated to José Antonio Muñoz.

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Mateos, A., Terradillos-Bernal, M. & Rodríguez, J. Energy Cost of Stone Knapping. J Archaeol Method Theory 26, 561–580 (2019). https://doi.org/10.1007/s10816-018-9382-2

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